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Hibernate error： java.sql.SQLException: Access denied for user 'root '#'localhost' (using password: YES) [duplicate]

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MySQL ERROR 1045 (28000): Access denied for user 'bill'#'localhost' (using password: YES)
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java.sql.SQLException: Access denied for user 'root'#'localhost' (using password: YES)
(1 answer)
Closed 5 years ago.
i am a beginner.when i use hibernate in eclipse,it shows :
ERROR: Access denied for user 'root '#'localhost' (using password:
YES) org.hibernate.exception.GenericJDBCException: Could not open
connection
i am a beginner.please help me,i don't konw what's wrong,and i counld not find a suitable answer throught the Internet or other answers on the stack overflow for my project.
Screenshot:
here is my code:
hibernate.properties:
hibernate.connection.driver_class = com.mysql.jdbc.Driver
hibernate.connection.url = jdbc:mysql://127.0.0.1:3306/db_test
hibernate.connection.username = root
hibernate.connection.password = root
hibernate.show_sql=true
hibernate.dialect = org.hibernate.dialect.MySQLDialect
hibernate.cfg.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- 映射文件 -->
<mapping resource="product/Product.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Product.java:
package product;
public class Product {
private int id;
private String name;
private Double price;
private String factory;
private String remark;
public int getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public String getFactory() {
return factory;
}
public void setFactory(String factory) {
this.factory = factory;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
}
Product.hbm.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="product.Product" table="product">
<id name="id" column="id" type="int">
<generator class="native"/>
</id>
<property name="name" type="string" length="16">
<column name="name"/>
</property>
<property name="price" type="double">
<column name="price"/>
</property>
<property name="factory" type="string" length="25">
<column name="factory"/>
</property>
<property name="remark" type="string" length="60">
<column name="remark"/>
</property>
</class>
</hibernate-mapping>
HibernateUtil.java:
package com.wgh.hibernate;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistryBuilder;
public class HibernateUtil {
private static final ThreadLocal<Session> threadLocal = new ThreadLocal <Session>();
private static SessionFactory sessionFactory = null; //SessionFactory对象
//静态块
static {
try {
Configuration cfg = new Configuration().configure(); //加载Hibernate配置文件
sessionFactory = cfg.buildSessionFactory(new ServiceRegistryBuilder().buildServiceRegistry());
} catch (Exception e) {
System.err.println("创建会话工厂失败");
e.printStackTrace();
}
}
/**
* 获取Session
* #return Session
* #throws HibernateException
*/
public static Session getSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (session == null || !session.isOpen()) {
if (sessionFactory == null) {
rebuildSessionFactory();
}
session = (sessionFactory != null) ? sessionFactory.openSession(): null;
threadLocal.set(session);
}
return session;
}
/**
* 重建会话工厂
*/
public static void rebuildSessionFactory() {
try {
Configuration cfg = new Configuration().configure(); //加载Hibernate配置文件
sessionFactory = cfg.buildSessionFactory(new ServiceRegistryBuilder().buildServiceRegistry());
} catch (Exception e) {
System.err.println("创建会话工厂失败");
e.printStackTrace();
}
}
/**
* 获取SessionFactory对象
* #return SessionFactory对象
*/
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
/**
* 关闭Session
* #throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close(); //关闭Session
}
}
}
servlet: QueryEmployee.java:
package servlet;
import java.io.IOException;
import product.*;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import com.wgh.hibernate.HibernateUtil;
/**
* Servlet implementation class QueryEmployee
*/
#WebServlet("/QueryEmployee")
public class QueryEmployee extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#HttpServlet()
*/
public QueryEmployee() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
#SuppressWarnings({ "unchecked" })
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("UTF-8");
List<Product> product_list = new ArrayList<Product>();//实例化List信息集合
Session session = null;// 实例化session对象
try {
session = HibernateUtil.getSession();// 获得session对象
String hql = "from Product";// 查询HQL语句
Query q = session.createQuery(hql);// 执行查询操作
product_list = q.list();//将返回的对象转化为List集合
} catch (HibernateException e) {
e.printStackTrace();
} finally {
HibernateUtil.closeSession();// 关闭session
}
request.setAttribute("product_list", product_list);
RequestDispatcher rd = this.getServletContext().getRequestDispatcher("/index.jsp");
rd.forward(request, response);
}
}
index.jsp:
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style type="text/css">
table {
border-left:5px solid #ffffff;
border-collapse: collapse;
}
td {
font: normal 12px/ 17px Arial;
padding: 2px;
}
th {
font: bold 12px/ 17px Arial;
padding: 4px;
border-bottom: 1px solid #333;
}
body {
font-size: 14px;
}
#main{
width:500px;
border:solid 1px #000000;
}
</style>
</head>
<body>
<div id="main">
<table>
<tr>
<th width="30px">编号</th>
<th width="30px">书名</th>
<th width="30px" align="center">价格</th>
<th width="80px">生产商</th>
<th width="135px">备注</th>
</tr>
<c:forEach items="${product_list}" var="list">
<tr>
<td align="center">${list.id}</td>
<td>${list.name}</td>
<td>${list.price}</td>
<td>${list.factory}</td>
<td>${list.remark}</td>
</tr>
</c:forEach>
</table>
<form action="QueryEmployee" method="post">
<input type="submit" value="查看" >
</form>
</div>
</body>
</html>
here is the whole error message:
org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:304)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169)
at org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.extractPhysicalConnection(ConnectionProxyHandler.java:82)
at org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.continueInvocation(ConnectionProxyHandler.java:138)
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
at com.sun.proxy.$Proxy8.prepareStatement(Unknown Source)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:147)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:166)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:145)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1711)
at org.hibernate.loader.Loader.doQuery(Loader.java:828)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
at org.hibernate.loader.Loader.doList(Loader.java:2438)
at org.hibernate.loader.Loader.doList(Loader.java:2424)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2254)
at org.hibernate.loader.Loader.list(Loader.java:2249)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1248)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at servlet.QueryEmployee.doPost(QueryEmployee.java:59)
at servlet.QueryEmployee.doGet(QueryEmployee.java:41)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.sql.SQLException: Access denied for user 'root '#'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:951)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1717)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1276)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2395)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2428)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2213)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:797)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:193)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:281)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:297)
... 46 more
九月 16, 2017 9:24:26 上午 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 1045, SQLState: 28000
九月 16, 2017 9:24:26 上午 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: Access denied for user 'root '#'localhost' (using password: YES)
org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:304)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169)
at org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.extractPhysicalConnection(ConnectionProxyHandler.java:82)
at org.hibernate.engine.jdbc.internal.proxy.ConnectionProxyHandler.continueInvocation(ConnectionProxyHandler.java:138)
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
at com.sun.proxy.$Proxy8.prepareStatement(Unknown Source)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:147)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:166)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:145)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1711)
at org.hibernate.loader.Loader.doQuery(Loader.java:828)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
at org.hibernate.loader.Loader.doList(Loader.java:2438)
at org.hibernate.loader.Loader.doList(Loader.java:2424)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2254)
at org.hibernate.loader.Loader.list(Loader.java:2249)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:470)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1248)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at servlet.QueryEmployee.doPost(QueryEmployee.java:59)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.sql.SQLException: Access denied for user 'root '#'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:951)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1717)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1276)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2395)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2428)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2213)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:797)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:389)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.getConnection(DriverManagerConnectionProviderImpl.java:193)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:281)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:297)
... 45 more
九月 16, 2017 9:27:26 上午 org.apache.catalina.core.StandardContext reload
信息: Reloading Context with name [/my_hibernate] has started
九月 16, 2017 9:27:26 上午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesJdbc
警告: The web application [my_hibernate] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
九月 16, 2017 9:27:27 上午 org.apache.jasper.servlet.TldScanner scanJars
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
九月 16, 2017 9:27:27 上午 org.apache.catalina.core.StandardContext reload
信息: Reloading Context with name [/my_hibernate] is completed

You don't have mysql server running or your mysql server does not have username=root or password=root, or you do not have access from the host that hibernate is running.
Check your mysql server's user accounts for 'root'.

LinkageError when using MethodHandle.publicLookup() in WAR files

we have a problem that we can not explain why it happens. perhaps someone here can us give some hints whats going on in this case.
we have tis simple reproucer written that shows the problem
package com.example.demo;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;
#SpringBootApplication
public class Application extends SpringBootServletInitializer {
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
#Bean
public CommandLineRunner runner() {
return (args) -> {
final Class<?> refc = Class.forName("com.example.demo.Family$Child");
System.out.println(refc.getClassLoader());
MethodHandle handle1 = MethodHandles.lookup().findStatic(refc, "getFirstChild", MethodType.methodType(refc));
System.out.println("handle1 = " + handle1);
MethodHandle handle2 = MethodHandles.publicLookup().findStatic(refc, "getFirstChild", MethodType.methodType(refc));
System.out.println("handle2 = " + handle2);
};
}
}
class Family {
public enum Child {
TOM, PAUL;
public static Child getFirstChild() {
return TOM;
}
}
}
when we now build a war file and depoly it to the tomcat everything is fine, but when we deploy it a second time with a different context path it crashes with the following exception
09-Jun-2017 09:21:54.706 SCHWERWIEGEND [http-nio-8080-exec-5] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/demo2]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:952)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:473)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1617)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1483)
at org.apache.catalina.manager.HTMLManagerServlet.upload(HTMLManagerServlet.java:279)
at org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:200)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:136)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:595)
at org.apache.catalina.valves.RequestFilterValve.process(RequestFilterValve.java:319)
at org.apache.catalina.valves.RemoteAddrValve.invoke(RemoteAddrValve.java:88)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Failed to execute CommandLineRunner
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:735)
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:716)
at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:703)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:304)
at org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:151)
at org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:131)
at org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:86)
at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5196)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 48 more
Caused by: java.lang.IllegalAccessException: no such method: com.example.demo.Family$Child.getFirstChild()Child/invokeStatic
at java.lang.invoke.MemberName.makeAccessException(MemberName.java:867)
at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1003)
at java.lang.invoke.MethodHandles$Lookup.resolveOrFail(MethodHandles.java:1386)
at java.lang.invoke.MethodHandles$Lookup.findStatic(MethodHandles.java:780)
at com.example.demo.Application.lambda$runner$0(Application.java:32)
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:732)
... 57 more
Caused by: java.lang.LinkageError: loader constraint violation: when resolving method "com.example.demo.Family$Child.getFirstChild()Lcom/example/demo/Family$Child;" the class loader (instance of <bootloader>) of the current class, java/lang/Object, and the class loader (instance of org/apache/catalina/loader/ParallelWebappClassLoader) for the method's defining class, com/example/demo/Family$Child, have different Class objects for the type com/example/demo/Family$Child used in the signature
at java.lang.invoke.MethodHandleNatives.resolve(Native Method)
at java.lang.invoke.MemberName$Factory.resolve(MemberName.java:975)
at java.lang.invoke.MemberName$Factory.resolveOrFail(MemberName.java:1000)
... 61 more
the only thing we found is that the cause is the publicLookup(). looking at the javadoc mentions some issues when using publicLookup() we we do not fully understand it.

Spring Controller fails my CRUD Operations what can be done about this?

This is picture of the error wich the browser returns after trying to submit the user:
1
Here is my Create method for Users also i use Repository for holding this methods.
private EntityManager entityManager = EntityManagerUtil.getEntityManager();
public String createUser(String account, String password) {
Users user = new UsersEntity(account, password);
entityManager.getTransaction().begin();
Query queryAccount = entityManager.createNativeQuery("Select * From Users Where Account = '" + account + "' ;",
UsersEntity.class);
List<Users> accountVerification = queryAccount.getResultList();
Query queryPassword = entityManager
.createNativeQuery("Select * From Users Where Password = '" + password + "' ;", UsersEntity.class);
List<Users> passwordVerification = queryPassword.getResultList();
if (accountVerification.size() != 0) {
return "This username is already used! Try with another one!";
} else if (passwordVerification.size() != 0) {
return "This password is already used! Try with another one!";
} else {
entityManager.persist(user);
entityManager.getTransaction().commit();
}
entityManager.close();
return "Sucessfull reccord!";
}
Here is my Controller:
#Controller
public class LibraryHelloWorld {
#RequestMapping(value = "/login", method = RequestMethod.GET)
public ModelAndView loginGet() {
return new ModelAndView("LogInForm");
}
#RequestMapping(value = "/login", method = RequestMethod.POST)
public ModelAndView loginPost(HttpServletRequest request, #RequestParam(value = "firstname") String account,
#RequestParam(value = "lastname") String password) {
JPAUsersRepository userrep = new JPAUsersRepository();
userrep.createUser(account.toString(), password.toString());
return new ModelAndView("Sucessfull");
}
In normal class creating of users is working fine but in this #Controller servlet in post method it throws exceptions :
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
Initial SessionFactory creation failed.javax.persistence.PersistenceException: [PersistenceUnit: test] Unable to build EntityManagerFactory
Apr 29, 2017 12:10:09 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [library] in context with path [/Library] threw exception [Handler processing failed; nested exception is java.lang.ExceptionInInitializerError] with root cause
java.lang.ClassNotFoundException: Could not load requested class : com.microsoft.sqlserver.jdbc.SQLServerDriver
at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:319)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:149)
at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:106)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:76)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:160)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:132)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:76)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:160)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:132)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1818)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1776)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
at com.infoleven.utility.EntityManagerUtil.<clinit>(EntityManagerUtil.java:11)
at com.infoleven.controller.LibraryHelloWorld.loginPost(LibraryHelloWorld.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:177)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Apr 29, 2017 12:10:24 AM org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
Here is also and my persistence.xml file:
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="test" transaction-type="RESOURCE_LOCAL">
<properties>
<property name="javax.persistence.jdbc.driver"
value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:sqlserver://localhost:1433;databaseName=Library" />
<property name="javax.persistence.jdbc.user" value="sa" />
<property name="javax.persistence.jdbc.password" value="notgame2" />
<property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect" />
<property name="show_sql" value="true" />
<property name="hibernate.temp.use_jdbc_metadata_defaults"
value="false" />
</properties>
</persistence-unit>
</persistence>
For DB i use local SQL Server. Create method is working correctly but not and in the current #Controller servler

Make sure you have correct JAR file in your CLASSPATH for com.microsoft.sqlserver.jdbc.SQLServerDriver
JAR file for that would be sqljdbc41.jar, if this is not in your CLASSPATH, then you have to add it. Hibernate will not provide 3rd party JAR files for JDBC Drivers.

Java connecting JDBC to Dynamic Web App

I have run into a problem that I have been trying to figure out for days:
I added my driver: mysql-connector-java-5.1.40.jar to build path.
web-inf lib folder, apache tomcat lib folder. And also I have it in web app libaries.
However when I just run a main class and run it works, it is something to do with the web app?
This is my code:
This is the servlet class, that I use to connect to my database
package sql;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class RegisterServlet
*/
#WebServlet("/register")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private DbUtil sql = new DbUtil();
/**
* #see HttpServlet#HttpServlet()
*/
public RegisterServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String email = request.getParameter("email");
String username = request.getParameter("username");
String password = request.getParameter("password");
if (sql.addToAccountToDatabase(username, password, email)) {
System.out.println("Gongratz");
} else {
System.out.println("mhhh ?");
}
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
}
this is the second class how i make connection
package sql;
import java.sql.*;
public class DbUtil {
public Connection getConnection() {
Connection connect = null;
try {
String url = "jdbc:mysql://hidden:3306/hidden";
connect = DriverManager.getConnection(url, "hidden", "hidden");
return connect;
} catch (Exception e) {
System.out.println("Cannot connect to database");
e.printStackTrace();
}
return connect;
}
public boolean addToAccountToDatabase(String username, String password, String email) {
try {
String query = "INSERT INTO Account (username, password, email) VALUES (?, ?,?)";
PreparedStatement pStat = getConnection().prepareStatement(query);
pStat.setString(1, username);
pStat.setString(2, password);
pStat.setString(3, email);
pStat.executeUpdate();
return true;
} catch (Exception e) {
System.out.println("User already exists");
e.printStackTrace();
return false;
}
}
}
And I get this error:
Cannot connect to database
java.sql.SQLException: No suitable driver found for jdbc:mysql://192.185.227.214:3306/ratekas9_illegalminds
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at sql.DbUtil.getConnection(DbUtil.java:15)
at sql.DbUtil.addToAccountToDatabase(DbUtil.java:34)
at sql.RegisterServlet.doPost(RegisterServlet.java:40)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
User already exists
java.lang.NullPointerException
at sql.DbUtil.addToAccountToDatabase(DbUtil.java:34)
at sql.RegisterServlet.doPost(RegisterServlet.java:40)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
mhhh ?

Because the String "jdbc:mysql" doesn't declare the driver Class itself, but only the name registered by a potential driver. You have to force the JVM to load the Driver class with a :
Class.forName("com.mysql.jdbc.Driver").newInstance();
before starting the JDBC connection.

You need 3 steps to solve your problem:
Add this code before connection Class.forName("com.mysql.jdbc.Driver");
Add 'JConnector.jar' into your project and build path.
Don't try enter same person because there is error in stack trace "User all ready exist ".

Adding the JAR file into your CLASSPATH (for compilation needs) / project's BUILDPATH and also under your project's WEB-INF/lib folder (for runtime references, i.e., when you deploy your application to an application server). For further reference, please go through this link
Class.forName("com.mysql.jdbc.Driver");
This is no longer required as per Official Java documentation here, but it is a mandatory step if you are using prior versions of JDBC 4.0.
This question can provide you lot many details on this regards.
Hope all these details help you resolve your issue!

Hibernate throws SQLException "id field does not have a default value"

In a spring mvc app using hibernate, I am encountering the following error when i try to persist an entity:
java.sql.SQLException: Field 'thirdIds_huid' doesn't have a default value
The database schema is generated by hbm2ddl. How can I change the hibernate code so that these entities can be persisted successfully?
The two entities are AClass and HClass. The code for AClass is::
import javax.persistence.*;
#Entity(name = "AClass")
#Table(name = "a_class")
public class AClass {
private Long auid;
private HClass firstId;
private List<HClass> secondIds;
private List<HClass> thirdIds;
#Id
#Column(name = "auid")
#GeneratedValue(strategy = GenerationType.AUTO)
public Long getAuid(){return auid;}
public void setAuid(Long hid){auid = hid;}
#ManyToOne
public HClass getFirstId(){return firstId;}
public void setFirstId(HClass tid){firstId = tid;}
#OneToMany
public List<HClass> getSecondIds(){return secondIds;}
public void setSecondIds(List<HClass> tid){secondIds = tid;}
#OneToMany
public List<HClass> getThirdIds(){return thirdIds;}
public void setThirdIds(List<HClass> i){thirdIds = i;}
}
The code for HClass is:
import javax.persistence.*;
#Entity(name = "HClass")
#Table(name = "h_class")
public class HClass {
private Long huid;
private String somefield;
#Id
#Column(name = "huid")
#GeneratedValue(strategy = GenerationType.AUTO)
public Long getHuid(){return huid;}
public void setHuid(Long hid){huid = hid;}
#Column(name = "somefield")
public String getSomefield(){return somefield;}
public void setSomefield(String rt){somefield = rt;}
}
The controller code that triggers the error is:
#RequestMapping(value = "/TriggerTheError", method = RequestMethod.GET)
public String processFindForm( HttpServletRequest request, Map<String, Object> model) {
AClass ac = new AClass();
HClass hc = new HClass();
hc.setSomefield("some value goes here");
List<HClass> hcs = new ArrayList<HClass>();
hcs.add(hc);
ac.setSecondIds(hcs);
HClass hc2 = new HClass();
hc2.setSomefield("another value goes here");
List<HClass> hcs2 = new ArrayList<HClass>();
hcs2.add(hc2);
ac.setThirdIds(hcs2);
persistAClass(ac);
return "ReproduceError";
}
public void persistAClass(AClass ac){
if(ac.getThirdIds()!=null){
if(ac.getThirdIds().size()==0){ac.setThirdIds(null);System.out.println("thirdids re-set to null.");}
if(ac.getThirdIds()!=null){
System.out.println("thirdids!=null: size is: "+ac.getThirdIds().size());
for(int dd = 0;dd<ac.getThirdIds().size();dd++){
this.serviceLayer.saveHClass(ac.getThirdIds().get(dd));
}
}
}
if(ac.getSecondIds()!=null){
if(ac.getSecondIds().size()==0){ac.setSecondIds(null);System.out.println("secondids re-set to null.");}
if(ac.getSecondIds()!=null){
System.out.println("secondsid!=null: size is:"+ac.getSecondIds().size());
for(int kk = 0;kk < ac.getSecondIds().size();kk++){
this.serviceLayer.saveHClass(ac.getSecondIds().get(kk));
}
}
}
if(ac.getFirstId()!=null){
System.out.println("firstid!=null: huid value is: "+ac.getFirstId().getHuid());
this.serviceLayer.saveHClass(ac.getFirstId());
}
System.out.println("-------------------- data follows ------------------------------");
for(int a=0;a<ac.getSecondIds().size();a++){
System.out.println("a, secondids somefield are: "+a+", "+ac.getSecondIds().get(a).getSomefield());
}
if(ac.getFirstId()!=null){
String rt = "";
if(ac.getFirstId().getSomefield()!=null){rt = ac.getFirstId().getSomefield();}
System.out.println("first id some field is: "+rt);
}
if(ac.getThirdIds()!=null){
for(int b = 0;b<ac.getThirdIds().size();b++){
String sf = "";
if(ac.getThirdIds().get(b).getSomefield()!=null){sf = ac.getThirdIds().get(b).getSomefield();}
System.out.println("b, third ids somefield are: "+b+", "+sf);
}
}
System.out.println("-------------------- end of data -------------------------------");
this.serviceLayer.saveAClass(ac);
}
Note that the line of code in the controller above that triggers the error is:
this.serviceLayer.saveAClass(ac);
The repository code finally called by the service layer is:
#Override
public void saveAClass(AClass myac) throws DataAccessException{
if (myac.getAuid() == null) {this.em.persist(myac);}
else {this.em.merge(myac);}
}
The complete stack trace is:
11:51:04.334 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.DispatcherServlet - Handler execution resulted in exception - forwarding to resolved error view: ModelAndView: reference to view with name 'exception'; model is {exception=org.springframework.orm.hibernate3.HibernateJdbcException: JDBC exception on Hibernate data access: SQLException for SQL [n/a]; SQL state [HY000]; error code [1364]; could not execute statement; nested exception is org.hibernate.exception.GenericJDBCException: could not execute statement}
org.springframework.orm.hibernate3.HibernateJdbcException: JDBC exception on Hibernate data access: SQLException for SQL [n/a]; SQL state [HY000]; error code [1364]; could not execute statement; nested exception is org.hibernate.exception.GenericJDBCException: could not execute statement
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:651) ~[spring-orm-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:106) ~[spring-orm-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:517) ~[spring-orm-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:755) ~[spring-tx-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:724) ~[spring-tx-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:475) ~[spring-tx-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:270) ~[spring-tx-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94) ~[spring-tx-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) ~[spring-aop-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) ~[spring-aop-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at com.sun.proxy.$Proxy27.saveAClass(Unknown Source) ~[na:na]
at example.controller.SomeModelClassController.persistAClass(SomeModelClassController.java:96) ~[SomeModelClassController.class:na]
at example.controller.SomeModelClassController.processFindForm(SomeModelClassController.java:50) ~[SomeModelClassController.class:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_79]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_79]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_79]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_79]
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) ~[spring-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) ~[spring-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) ~[spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) ~[spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) ~[spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) [spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) [spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) [spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827) [spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) [servlet-api.jar:na]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) [spring-webmvc-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [servlet-api.jar:na]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.15]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) [spring-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.15]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.15]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-3.2.5.RELEASE.jar:3.2.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.15]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [catalina.jar:8.0.15]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.15]
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) [catalina.jar:8.0.15]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.15]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) [catalina.jar:8.0.15]
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085) [tomcat-coyote.jar:8.0.15]
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) [tomcat-coyote.jar:8.0.15]
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) [tomcat-coyote.jar:8.0.15]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556) [tomcat-coyote.jar:8.0.15]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513) [tomcat-coyote.jar:8.0.15]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_79]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_79]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.15]
at java.lang.Thread.run(Thread.java:745) [na:1.7.0_79]
Caused by: org.hibernate.exception.GenericJDBCException: could not execute statement
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:58) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1256) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.action.internal.CollectionRecreateAction.execute(CollectionRecreateAction.java:58) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:364) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:356) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:281) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:328) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1234) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:404) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:75) ~[hibernate-entitymanager-4.2.1.Final.jar:4.2.1.Final]
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:513) ~[spring-orm-3.2.5.RELEASE.jar:3.2.5.RELEASE]
... 57 common frames omitted
Caused by: java.sql.SQLException: Field 'thirdIds_huid' doesn't have a default value
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2617) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2778) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2825) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2156) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2459) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2376) ~[mysql-connector-java-5.1.27.jar:na]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2360) ~[mysql-connector-java-5.1.27.jar:na]
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:133) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
... 71 common frames omitted
11:51:04.336 [http-nio-8080-exec-3] DEBUG o.s.w.s.v.ContentNegotiatingViewResolver - Requested media types are [text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8] based on Accept header types and producible media types [*/*])
11:51:04.336 [http-nio-8080-exec-3] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Invoking afterPropertiesSet() on bean with name 'exception'
11:51:04.337 [http-nio-8080-exec-3] DEBUG o.s.w.s.v.ContentNegotiatingViewResolver - Returning [org.springframework.web.servlet.view.JstlView: name 'exception'; URL [/WEB-INF/jsp/exception.jsp]] based on requested media type 'text/html'
11:51:04.337 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.DispatcherServlet - Rendering view [org.springframework.web.servlet.view.JstlView: name 'exception'; URL [/WEB-INF/jsp/exception.jsp]] in DispatcherServlet with name 'MinimalDbaseExample'
11:51:04.337 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.view.JstlView - Added model object 'exception' of type [org.springframework.orm.hibernate3.HibernateJdbcException] to request in view with name 'exception'
11:51:04.337 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.view.JstlView - Forwarding to resource [/WEB-INF/jsp/exception.jsp] in InternalResourceView 'exception'
11:51:04.380 [http-nio-8080-exec-3] DEBUG o.s.web.servlet.DispatcherServlet - Successfully completed request
ANSWER
The solution came from the part of #VladMihalcea's answer that involved removing the multiple references to HClass in the list of properties of AClass. Specifically, I created types HClassFirst, HClassSecond, and HClassThird, all with the same properties and methods. This way, hibernate did not get confused by multiple properties of AClass linking to the same type. The app's architecture allows for this. I decided against using inheritance because there are already a lot of links in each table, and I don't want to bump into other errors related to an excess number of foreign keys.
Thus, the solution was not in hibernate annotations. Instead, the solution was in adjusting the model that hibernate is being asked to persist.

I think it's much simpler to use cascading in this example:
#Entity(name = "AClass")
#Table(name = "a_class")
public class AClass {
private Long auid;
private HClass firstId;
private List<HClass> secondIds = new ArrayList<>();
private List<HClass> thirdIds = new ArrayList<>();
#Id
#Column(name = "auid")
#GeneratedValue(strategy = GenerationType.AUTO)
public Long getAuid(){return auid;}
public void setAuid(Long hid){auid = hid;}
#ManyToOne
public HClass getFirstId(){return firstId;}
public void setFirstId(HClass tid){firstId = tid;}
#OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
public List<HClass> getSecondIds(){return secondIds;}
public void setSecondIds(List<HClass> tid){secondIds = tid;}
#OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
public List<HClass> getThirdIds(){return thirdIds;}
public void setThirdIds(List<HClass> i){thirdIds = i;}
}
Then the persisting logic becomes just that:
public void persistAClass(AClass ac){
this.serviceLayer.saveAClass(ac);
}
The original issue might be due to this:
at org.hibernate.action.internal.CollectionRecreateAction.execute(CollectionRecreateAction.java:58) ~[hibernate-core-4.2.1.Final.jar:4.2.1.Final]
This is how you should initialize collections in your entities:
private List<HClass> secondIds = new ArrayList<>();
private List<HClass> thirdIds = new ArrayList<>();
So, when you want to modify the collections, you don't reset them, but rather rely on the dirty checking mechanism to add/remove elements:
AClass ac = new AClass();
HClass hc = new HClass();
hc.setSomefield("some value goes here");
ac.getSecondIds().add(hc);
HClass hc2 = new HClass();
hc2.setSomefield("another value goes here");
ac.getThirdIds().add(hc2);
persistAClass(ac);
During a merge, you should remove the children that no longer belong to a parent and add the new ones coming from your web request.
Edit
I tried your example on my local machine and like the problem is the way you do the mappings. Because you link the Aclass with HClass on 3 different relations (one many-to-one and 2 one-to-many), this is what you get:
create table a_class (auid bigint generated by default as identity (start with 1), firstId_huid bigint, primary key (auid))
create table a_class_h_class (a_class_auid bigint not null, thirdIds_huid bigint not null, secondIds_huid bigint not null)
create table h_class (huid bigint generated by default as identity (start with 1), somefield varchar(255), primary key (huid))
alter table a_class_h_class add constraint UK_qtt8gi008ssnfi4t3mo3tq310 unique (thirdIds_huid)
alter table a_class_h_class add constraint UK_35k583bmbiomo0rc6t74ba41g unique (secondIds_huid)
alter table a_class add constraint FK_1hw1d6sy2yhp9hirqgb6rx6yr foreign key (firstId_huid) references h_class
alter table a_class_h_class add constraint FK_qtt8gi008ssnfi4t3mo3tq310 foreign key (thirdIds_huid) references h_class
alter table a_class_h_class add constraint FK_jng9ogc4rmlmojd31weygk6l9 foreign key (a_class_auid) references a_class
alter table a_class_h_class add constraint FK_35k583bmbiomo0rc6t74ba41g foreign key (secondIds_huid) references h_class
So when you try to enter an entity:
Query:{[insert into a_class (auid, firstId_huid) values (default, ?)][-5]}
Query:{[insert into h_class (huid, somefield) values (default, ?)][some value goes here]}
Query:{[insert into h_class (huid, somefield) values (default, ?)][another value goes here]}
Query:{[insert into a_class_h_class (a_class_auid, secondIds_huid) values (?, ?)][1,1]}
WARN [Alice]: o.h.e.j.s.SqlExceptionHelper - SQL Error: -10, SQLState: 23502
ERROR [Alice]: o.h.e.j.s.SqlExceptionHelper - integrity constraint violation: NOT NULL check constraint; SYS_CT_10096 table: A_CLASS_H_CLASS column: THIRDIDS_HUID
The only fix is to change the Mapping. Instead of 3 HClass associations you should have something else, maybe an inheritance model or something. Always try to model your domain entities on a valid schema.

the "persist detached entity error" is because new transaction is opened for each persist action. For new opened transaction, the entity persisted(the HCClass) in last transaction become "detached".
I suggest you group all you persist action in one transaction, you can do it by move persistAClass to service layer and annotate it #Transactional.