Getting 404 error while calling rest service methods in java(RestEasy)

Getting 404 error while calling rest service methods in java(RestEasy) - java

I have designed a simple service to insert customer details to db and retrieve data from it. But when ever i am calling any service , i am getting 404 error.
I have provided my code below .
Customer.java
package com.fetch;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Id;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
#XmlRootElement(name = "Customer")
#XmlType(name = "Customer")
#XmlAccessorType(XmlAccessType.FIELD)
public class Customer //implements Serializable
{
#Id
private long id;
#Column(name = "NAME")
private String name;
public Customer(int id, String name)
{
this.id = id;
this.name = name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
MyAccount.Java
package com.fetch;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.persistence.Entity;
import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
//#WebService()
//#Entity
#Path("user")
public class MyAccount
{
#POST
#Path("fetch")
//#WebMethod(operationName = "insert")
#Consumes(MediaType.TEXT_PLAIN)
public String insert(#QueryParam("name") String name)
{
try
{
// Class.forName("com.mysql.jdbc.Driver");
// Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/studentinfo", "root", "root");
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:#localhost:1521:orcl", "scott", "tiger");
String query = "insert into CUSTOMER"+"(NAME) VALUES"+"(?)";
PreparedStatement st = con.prepareStatement(query);
st.setString(1,name);
st.executeUpdate();
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
return"Record inserted successfully";
}
#GET
#Path("retrive")
#Produces("text/html")
//#WebMethod(operationName = "retrive")
public String retrive()
{
ResultSet rs = null;
String details = "";
try
{
//Class.forName("com.mysql.jdbc.Driver");
//Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/studentinfo", "root", "root");
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:#localhost:1521:orcl", "scott", "tiger");
String query = "select ID,NAME from CUSTOMER";
PreparedStatement st = con.prepareStatement(query);
rs = st.executeQuery();
details = "<html><body>";
details = details + "<table border=1>";
details = details + "<tr><td><Strong>Id </Strong></td>" +
"<td><Strong>Name </Strong></td>" + "</tr>";
while (rs.next())
{
details = details + "<tr><td>" + rs.getInt("ID") + "</td>" +
"<td>" + rs.getString("NAME") + "</td></tr>";
}
details += "</table></body></html>";
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
return details;
}
}
insert.jsp
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js">
</script>
<script type="text/javascript">
$(document).ready(function() {
$('#call').click(function ()
{
$.ajax({
type: "post",
url: "rest/user/fetch", //this is my servlet
data: "name=" +$('#name').val(),
success: function(msg){
$('#output').html(msg);
}
});
});
$('#take').click(function ()
{
$.ajax({
type: "get",
url: "rest/user/retrive",
success: function(msg){
$('#output').html(msg);
}
});
});
});
</script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="">
<!-- <form action="rest/user/fetch" method="POST"> -->
<p>
Name : <input id="name" name="name" />
</p>
<input type="button" name="call" id="call" value="Insert"/>
<!-- </form> -->
<!-- <form action="rest/user/retrive" method="GET"> -->
<input type="button" name="take" id="take" value="Retrive"/>
<!-- </form> -->
<p>
Response : <div type="text" id="output"></div>
</p>
</form>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>FetchAndInsert</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>REST Servlet</servlet-name>
<servlet-
class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.fetch</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>REST Servlet</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
JAR DETAILS:
javax.ws.rs-api-2.0-m02.jar
ojdbc14.jar
persistence-api-2.0.jar

Check if the rest service started successfully with no failure in logs.
Have you included jersey API in jar list?
Are you calling the web service with proper URL? (ex: http:servername:portno/FetchAndInsert/rest/user/fetch with POST and http:servername:portno/FetchAndInsert/rest/user/retrive as GET)
Check if you would need POST or GET for fetch web service?
com.sun.jersey is the old API. You can use glassfish version.

Related

Registration form using JDBC and Servlet in java

I have problem accessing database with servlet java. I want to add users with an html registration form. this is the html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Registration Page</title>
<!---Custom CSS File--->
<link rel="stylesheet" href="style.css" />
</head>
<body>
<header>Registration Form</header>
<form action="register" method="post" class="form">
<div class="input-box">
<label>Full Name</label>
<input type="text" name="txtUname" placeholder="Enter full name" required />
</div>
<div class="input-box">
<label>Email Address</label>
<input type="email" name="Email" placeholder="Enter email address" required />
</div>
<div class="input-box">
<label>Password</label>
<input type="password" name="Pass" placeholder="Password" required />
</div>
<button>REGISTER</button>
</form>
</body>
</html>
This is the servlet (RegistrationControllerServlet.java)
package com.loginpagedemo.controller;
import java.io.IOException;
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 com.loginpagedemo.dao.UserDao;
import com.loginpagedemo.daoimpl.UserDaoImpl;
import com.loginpagedemo.pojo.User;
#WebServlet("/register")
public class RegistrationControllerServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String uname = request.getParameter("txtUname");
String password = request.getParameter("Pass");
String email = request.getParameter("Email");
User u = new User(uname,password,email);
UserDao daoImpl = new UserDaoImpl();
if(daoImpl.addNewUser(u)) {
response.sendRedirect("Success?msg=regsuccess");
}
else {
response.sendRedirect("error?msg=regerror");
}
}
}
This is the java class (User.java):
package com.loginpagedemo.pojo;
public class User {
private String username;
private String emailaddress;
private String password;
public User() {
}
public User(String username,String emailaddress,String password){
this.username = username;
this.emailaddress =emailaddress;
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getEmailaddress() {
return emailaddress;
}
public void setEmailaddress(String emailaddress) {
this.emailaddress = emailaddress;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
This is the java Interface (UserDao.java):
package com.loginpagedemo.dao;
import com.loginpagedemo.pojo.User;
public interface UserDao {
boolean checkUserCredentials(User user);
boolean addNewUser(User user);
}
This is the java class (DbConnection.java):
package com.loginpagedemo.connection;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DbConnection {
public static Connection getDatabaseConnection(){
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con =
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/28thnovadv",
"root","ROOT#123");
return con;
}
catch(ClassNotFoundException | SQLException exc) {
exc.printStackTrace();
return null;
}
}
}
This is the java class (UserDaoImpl.java):
package com.loginpagedemo.daoimpl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.loginpagedemo.connection.DbConnection;
import com.loginpagedemo.dao.UserDao;
import com.loginpagedemo.pojo.User;
public class UserDaoImpl implements UserDao {
#Override
public boolean checkUserCredentials(User user) {
try(Connection con =
DbConnection.getDatabaseConnection()){
PreparedStatement st = con.prepareStatement(
"SELECT * FROM userdata WHERE username=? AND email=? AND password=?");
st.setString(1, user.getUsername());
st.setString(2, user.getEmailaddress());
st.setString(3, user.getPassword());
ResultSet rs =st.executeQuery();
if(rs.isBeforeFirst())
return true;
else
return false;
}
catch(SQLException | NullPointerException exc){
exc.printStackTrace();
return false;
}
}
#Override
public boolean addNewUser(User user) {
try(Connection con =
DbConnection.getDatabaseConnection()){
PreparedStatement st = con.prepareStatement(
"INSERT INTO userdata VALUES(?,?,?)");
st.setString(1, user.getUsername());
st.setString(2, user.getEmailaddress());
st.setString(3, user.getPassword());
int count = st.executeUpdate();
if(count > 0)
return true;
else
return false;
}
catch(SQLException | NullPointerException exc){
exc.printStackTrace();
return false;
}
}
}
This is the Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
<display-name>LoginpageJDBC</display-name>
<welcome-file-list>
<welcome-file>RegistartionFrom.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>registration</servlet-name>
<servlet-class>com.loginpagedemo.controller.RegistrationControllerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>registration</servlet-name>
<url-pattern>/register</url-pattern>
</servlet-mapping>
</web-app>
Folder Structure
error after updated
I'm sorry that is a long question, but I am in despair

Looks like your implementation of method dopost() is wrong.
It should be doPost().
https://jenkov.com/tutorials/java-servlets/httpservlet.html
Like this:
protected void doPost(HttpServletRequest request, HttpServletResponse response) {
You can also try to configure manually the servlet in WEB-INF/web.xml.
Something like:
<web-app>
<servlet>
<servlet-name>registration</servlet-name>
<servlet-class>com.loginpagedemo.controller.RegistrationControllerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>registration</servlet-name>
<url-pattern>/register</url-pattern>
</servlet-mapping>
</web-app>
https://javapapers.com/servlet/what-is-servlet-mapping/

Login form with MySQL via JDBC: Model driven in Struts 2

I am new to struts2. I am using NetBeans8, Glassfish4 and MySql6.
I am making a login form. The problem I am having is is that I am not getting either an error or any output.
I can run my application and at my login page after clicking on submit nothing happens, but my url changes to http://localhost:8080/Pharma/loginAction.action
Please could somebody help, your suggestions would be highly appreciated
LoginAction.java
package package_login;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.lang3.StringUtils;
public class LoginAction extends ActionSupport implements ModelDriven<User>{
User user=new User();
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
#Override
public User getModel() {
return user;
}
public void validate(){
if(StringUtils.isEmpty(user.getEmail())){
addFieldError("email","Please entered your email");
}
if(StringUtils.isEmpty(user.getPassword())){
addFieldError("password","Please entered your password");
}
}
public String execute() throws ClassNotFoundException, SQLException {
LoginService loginService= new LoginService();
if(loginService.verifyLogin(user)){
return "logged";
}
return "login";
}
}
LoginService.java
package package_login;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
class LoginService {
public boolean verifyLogin(User user) throws ClassNotFoundException, SQLException{
Class.forName("com.mysql.jdbc.Driver");
Connection con= DriverManager.getConnection("jdbc:mysql://localhost:3306/erp","root","ali$");
Statement st= con.createStatement();
ResultSet rs= st.executeQuery("select password,email from login where email='"+user.getEmail()+"'" );
while(rs.next()){
// if(user.getEmail().equals(rs.getString("email"))&& user.getPassword().equals("password")){
// return true;
}
// }
return false;
}
}
User.java
package package_login;
class User {
private String email;
private String password;
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
login.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<!-- Configuration for the default package. -->
<package name="package_login" extends="struts-default">
<action name="loginAction" class="package_login.LoginAction">
<result name="logged">/welcome.jsp</result>
<result name="login">/login.jsp</result>
<result name="input">/login.jsp</result>
</action>
</package>
</struts>
login.jsp
<%#taglib uri="/struts-tags" prefix="s"%>
<%#page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<s:form action="loginAction">
<s:textfield key="email" label="Email"/>
<s:password key="password" label="Password"/>
<s:submit value="login"/>
</s:form>
</body>
</html>

ResultSet rs= st.executeQuery("select email from login where email='"+user.getEmail()+"' and password='"+user.getPassword()+"'" );
if(rs.next())
{
return true;//if valid user, return true
}
else
return false;
and
your are using struts configuration file name login.xml.
The struts configuration file name instead of login.xml should use struts.xml
Instead of Statement, use PrepareStatement or callablestatement to avoid sql injection.
Link

insert update delete in Struts 2 but showing NullPointerException

Here I come up with problem with Operation like update,delete and view so now insert is working but other operation like update, delete, view showing error like. Could some one can guide to go right direction? This what I have tried up to now
Error:
HTTP Status 500 - java.lang.NullPointerException
type Exception report
message java.lang.NullPointerException
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NullPointerException
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:515)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:419)
root cause
java.lang.NullPointerException
Action.Testiue.view(Testiue.java:115)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:404)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:229)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:221)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48)
struts.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<include file="struts-default.xml" />
<package name="a" extends="struts-default">
<action name="adduser" class="Action.Testiue" method="add">
<result name="success">/insert.jsp</result>
<result name="success">/ssuccess.jsp</result>
</action>
<action name="viewuser" class="Action.Testiue" method="view">
<result name="success">/view.jsp</result>
<result name="error">/error.jsp</result>
</action>
<action name="updateuser" class="Action.Testiue" method="update">
<result name="success">/edit.jsp</result>
<result name="error">/error.jsp</result>
</action>
<action name="deleteuser" class="Action.Testiue" method="delete">
<result name="success">/dsuccess.jsp</result>
<result name="error">/error.jsp</result>
</action>
</package>
</struts>
Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
TestIUE.java
package Action;
import com.opensymphony.xwork2.ActionSupport;
import dao.UserDao;
import dbBean.UseBean;
public class Testiue
{
private String Name;
private String Password;
private String EmailID;
private String Phoneo;
private int ID;
public String getName()
{
return Name;
}
public void setName(String name)
{
Name = name;
}
public String getPassword()
{
return Password;
}
public void setPassword(String password)
{
Password = password;
}
public String getEmailID()
{
return EmailID;
}
public void setEmailID(String emailID)
{
EmailID = emailID;
}
public String getPhoneo()
{
return Phoneo;
}
public void setPhoneo(String phoneo)
{
Phoneo = phoneo;
}
public int getID()
{
return ID;
}
public void setID(int i)
{
ID = i;
}
#Override
public String toString()
{
return "UseBean [id=" + ID + ", Name=" + Name+ ", Password=" + Password + ", EmailID=" + EmailID + ", Phoneo="+ Phoneo + "]";
}
private UserDao dao;
private UseBean bean;
public String add()
{
dao=new UserDao();
bean=new UseBean();
System.out.println(getName()+""+getPassword()+""+getPhoneo()+""+getEmailID());
bean.setID(ID);
bean.setName(Name);
bean.setPassword(Password);
bean.setPhoneo(Phoneo);
bean.setEmailID(EmailID);
dao.addUser(bean);
return ActionSupport.SUCCESS;
}
public String update()
{
dao=new UserDao();
bean=new UseBean();
//System.out.println(getName()+""+getPassword()+""+getPhoneo()+""+getEmailID());
bean.setID(ID);
bean.setName(Name);
bean.setPassword(Password);
bean.setPhoneo(Phoneo);
bean.setEmailID(EmailID);
dao.updateUser(bean);
return ActionSupport.SUCCESS;
}
public String delete()
{
int userId =0;
dao.deleteUser(userId);
return ActionSupport.SUCCESS;
}
public String edit()
{
int userId =0;
bean = dao.getUserById(userId);
return ActionSupport.SUCCESS;
}
public String view()
{
dao.getAllUsers();
return ActionSupport.SUCCESS;
}
}
Index.jsp
<META HTTP-EQUIV="Refresh" CONTENT="0;URL=viewuser.action">
view.jsp;
<%# taglib prefix="s" uri="/struts-tags"%>
<%#page import="java.util.*,dbBean.*,Dbconnect.*,java.util.*"%>
Insert
<table border=1>
<thead>
<tr>
<th>Id</th>
<th>Name</th>
<th>password</th>
<th>phoneno</th>
<th>emailid</th>
<th colspan=2>Action</th>
</tr>
</thead>
<jsp:useBean id="users" class="java.util.ArrayList" scope="request" />
<% for(int i = 0; i < users.size(); i+=1)
{
UseBean user = (UseBean)users.get(i);
%>
<tbody>
<tr>
<td><%= user.getID() %></td>
<td><%= user.getName() %></td>
<td><%= user.getPassword() %></td>
<td><%= user.getEmailID() %></td>
<td><%= user.getPhoneo() %></td>
<td>Update</td>
<td>Delete</td>
</tr>
<%
}
%>
</tbody>
</table>
edit.jsp:
<%# page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!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>
</head>
<body>
<form action="updateuser">
id:<input type="text" name="ID" ><br/>
Name:<input type="text" name="Name" ><br/>
Password:<input type="text" name="password" ><br/>
phoneno:<input type="text" name="Phoneo" ><br/>
Emailid:<input type="text" name="Emailid" > <br/>
<input type="submit" value="Submit" />
</form>
</body>
</html>
UserDao.java
package dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import dbBean.UseBean;
import Dbconnect.*;
public class UserDao
{
private Connection conn;
public UserDao()
{
conn=Dbconnect.getConnection();
}
public void addUser(UseBean bean)
{
try
{
String sql="insert into senthil (name,pass,phoneno,emailid) values(?,?,?,?)";
PreparedStatement ps=conn.prepareStatement(sql);
ps.setString(1,bean.getName());
ps.setString(2,bean.getPassword());
ps.setString(3,bean.getPhoneo());
ps.setString(4,bean.getEmailID());
ps.executeUpdate();
}
catch (Exception e)
{
// TODO: handle exception
}
}
public void deleteUser(int userId)
{
try
{
PreparedStatement ps = conn.prepareStatement("delete from senthil where id=?");
// Parameters start with 1
ps.setInt(1, userId);
ps.executeUpdate();
} catch (SQLException e)
{
e.printStackTrace();
}
}
public void updateUser(UseBean bean)
{
try
{
PreparedStatement preparedStatement = conn.prepareStatement("update senthil set name=?, pass=?, phoneno=?, emailid=?"+ "where id=?");
// Parameters start with 1
preparedStatement.setString(1, bean.getName());
preparedStatement.setString(2, bean.getPassword());
preparedStatement.setString(3, bean.getPhoneo());
preparedStatement.setString(4, bean.getEmailID());
preparedStatement.setInt(5, bean.getID());
preparedStatement.executeUpdate();
}
catch (SQLException e)
{
e.printStackTrace();
}
}
public List<UseBean> getAllUsers()
{
List<UseBean> users = new ArrayList<UseBean>();
try
{
Statement statement = conn.createStatement();
ResultSet rs = statement.executeQuery("select * from senthil");
while (rs.next())
{
UseBean user = new UseBean();
user.setID(rs.getInt("id"));
user.setName(rs.getString("name"));
user.setPassword(rs.getString("pass"));
user.setPhoneo(rs.getString("phoneno"));
user.setEmailID(rs.getString("emailid"));
users.add(user);
}
}
catch (SQLException e)
{
e.printStackTrace();
}
return users;
}
public UseBean getUserById(int userId)
{
UseBean user = new UseBean();
try
{
PreparedStatement preparedStatement = conn.prepareStatement("select * from senthil where id=?");
preparedStatement.setInt(1, userId);
ResultSet rs = preparedStatement.executeQuery();
if (rs.next())
{
user.setID(rs.getInt("id"));
user.setName(rs.getString("name"));
user.setPassword(rs.getString("pass"));
user.setPhoneo(rs.getString("phoneno"));
user.setEmailID(rs.getString("emailid"));
}
} catch (SQLException e)
{
e.printStackTrace();
}
return user;
}
}

In the JSP the users should be available to the request scope.
public String view() {
UserDao userDao = new UserDao();
List<UseBean> users = userDao.getAllUsers();
ServletActionContext.getRequest().setAttribute("users", users);
return Action.SUCCESS;
}
public String update() {
UserDao dao = new UserDao();
UseBean bean=new UseBean();
HttpServletRequest request ServletActionContext.getRequest();
bean.setID(request.getParameter("ID");
bean.setName(request.getParameter("Name");
bean.setPassword(request.getParameter("Password");
bean.setPhoneo(request.getParameter("Phoneo");
bean.setEmailID(request.getParameter("EmailID");
//System.out.println(getName()+""+getPassword()+""+getPhoneo()+""+getEmailID());
dao.updateUser(bean);
return Action.SUCCESS;
}
public String delete() {
HttpServletRequest request ServletActionContext.getRequest();
int userId = request.getParameter("ID");
dao.deleteUser(userId);
return Action.SUCCESS;
}
for delete action
<s:param name='ID'><%=user.getID()%></s:param></s:url>">Delete

Inside view method you haven't initialized the dao object(i.e reference is null), add the following code :
In TestIUE.java add one more member variable :
List<UseBean> users = new ArrayList<UseBean>();
Also add Accessor method :
public List<UseBean> getUsers()
{
return users;
}
Now modify your view method as follows :
public String view()
{
dao = new UseDao();
users = dao.getAllUsers();
return ActionSupport.SUCCESS;
}

SelectOneMenu doesn't have any value to choose from

when I try to display employee.jsp page I am not able to select employee.
It looks like SelectOneMenu doesn't work. Am I missing something in that tag (line 20)?
I checked and the database has table employee with some employee data.
I have connection to database. I use mysql database. You can see connection to this database in persistance.xml file.
<%# page language="java" contentType="text/html;
charset=US-ASCII" pageEncoding="US-ASCII"%>
<%# taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%# taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!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=ISO-8859-1">
<title>Employee Details</title>
</head>
<body>
<f:view>
<h2><center>Welcome to Employee Home Page</center></h2>
<br><br>
<h:form>
<h2>
Select an Employee Number from the drop down:
</h2>
<br><br>
<h:selectOneMenu id="selEmpNo"
valueChangeListener="#{employee.employeeReport}"
onchange="submit()">
<f:selectItem itemLabel="select" />
<f:selectItems value="#{employee.empNoList}" id="emp"/>
</h:selectOneMenu>
</h:form>
<br><br>
<h2>
<h:outputText value="Employee Name: "></h:outputText>
<h:outputText value="#{employee.empName}"/>
<br><br>
<h:outputText value="Employee Number: "/>
<h:outputText value="#{employee.empNo}"/>
<br><br>
<h:outputText value="Name of the IBU: "/>
<h:outputText value="#{employee.ibu}"/>
<br><br>
<h:outputText value="Designation: "/>
<h:outputText value="#{employee.designation}"/> </h2>
</f:view>
</body>
</html>
<%# page language="java" contentType="text/html;
charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%# taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%# taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!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=US-ASCII">
<title>Home</title>
</head>
<body>
<f:view>
<h2>
<center>
<h:outputLabel> Welcome!!!</h:outputLabel>
</center>
<h:outputLink value="employee.jsp">Employee Details</h:outputLink>
</h2>
</f:view>
</body>
</html>
</html>
package employee;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.faces.event.ValueChangeEvent;
import javax.faces.model.SelectItem;
public class EmployeeBean {
private String empName;
private String ibu;
private String designation;
private int empNo;
//This is used to dynamically populate the drop down with employee numbers
List<SelectItem> empNoList;
List<EmployeeEntity>empList;
public EmployeeBean(){
this.empNoList = new ArrayList<SelectItem>();
/*Populating Employee Number in the drop down - Dynamic */
empList = new EmployeeService().getEmployeeList();
Iterator<EmployeeEntity>iterator = empList.iterator();
while(iterator.hasNext()){
EmployeeEntity employee = iterator.next();
SelectItem item = new SelectItem(employee.getEmpNo());
empNoList.add(item);
}
System.out.println(empNoList);
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
public String getIbu() {
return ibu;
}
public void setIbu(String ibu) {
this.ibu = ibu;
}
public String getDesignation() {
return designation;
}
public void setDesignation(String designation) {
this.designation = designation;
}
public int getEmpNo() {
return empNo;
}
public void setEmpNo(int empNo) {
this.empNo = empNo;
}
public List<SelectItem> getEmpNoList() {
return empNoList;
}
public void setEmpNoList(List<SelectItem> empNoList) {
this.empNoList = empNoList;
}
public List<EmployeeEntity> getEmpList() {
return empList;
}
public void setEmpList(List<EmployeeEntity> empList) {
this.empList = empList;
}
/*Eventlistener - for fetching an employee record based on the selection of employee
number from the drop down*/
public void employeeReport(ValueChangeEvent event){
int empNo = Integer.parseInt((String)event.getNewValue());
EmployeeEntity employee = new EmployeeService().getEmployee(empNo);
this.empNo = employee.getEmpNo();
this.empName = employee.getEmpName();
this.ibu = employee.getIbu();
this.designation = employee.getDesignation();
}
}
package employee;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="employee")
public class EmployeeEntity {
#Id
private int empNo;
private String empName;
private String ibu;
private String designation;
public int getEmpNo() {
return empNo;
}
public void setEmpNo(int empNo) {
this.empNo = empNo;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
public String getIbu() {
return ibu;
}
public void setIbu(String ibu) {
this.ibu = ibu;
}
public String getDesignation() {
return designation;
}
public void setDesignation(String designation) {
this.designation = designation;
}
}
package employee;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.Query;
public class EmployeeService {
public List<EmployeeEntity> getEmployeeList(){
List<EmployeeEntity> empList = new ArrayList<EmployeeEntity>();
EntityManager em = null;
try{
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("Employee-
Details");
em = emf.createEntityManager();
EntityTransaction et = em.getTransaction();
et.begin();
Query query = em.createQuery("select empNo from employee ");
empList = query.getResultList();
}
catch(Exception e){
//log the exception
}
return empList;
}
public EmployeeEntity getEmployee(int empNo){
EmployeeEntity employee = new EmployeeEntity();
EntityManager em = null;
try{
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("Employee-Details");
em = emf.createEntityManager();
EntityTransaction et = em.getTransaction();
employee = em.find(EmployeeEntity.class, empNo);
}
catch(Exception e){
//log the exception
}
finally{
if( em != null){
em.clear();
}
}
return employee;
}
}
<faces-config version="1.2"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">
<navigation-rule>
<display-name>Employee</display-name>
<from-view-id>/index.jsp</from-view-id>
</navigation-rule>
<managed-bean>
<managed-bean-name>employee</managed-bean-name>
<managed-bean-class>employee.EmployeeBean
</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
</faces-config>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>Generating Employee Report</display-name>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

you should add the value to the selectOneMenu, the valueChangeListener attribute accepts a method-binding expression representing a value change listener method to be notified when a new value has been set for this input component. A value change listener method must be a public method that takes a ValueChangeEvent parameter, with a return type of void. It's not the same as the value property.
Your page.
<h:selectOneMenu id="selEmpNo"
valueChangeListener="#{employee.employeeReport}"
onchange="submit()" value="#{employee.myvalue}">
<f:selectItem itemLabel="select" />
<f:selectItems value="#{employee.empNoList}" id="emp"/>
</h:selectOneMenu>
EmployeeBean
package employee;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.faces.event.ValueChangeEvent;
import javax.faces.model.SelectItem;
public class EmployeeBean {
private String myValue;
private String empName;
private String ibu;
private String designation;
public String getMyValue() {
return myValue;
}
public void setMyValue(String myValue) {
this.myValue = myValue;
}
Regards
Source here

How to retrieve data from database using webservices (JAX - RS) in eclipse using Java

I have done inserting a record into database but I don't know how to retrieve it.
My code is:
Account.java:
package com.fetch;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Id;
public class Account implements Serializable
{
#Id
private long id;
#Column(name="NAME")
private String name;
public Account()
{
}
public Account(int id, String name)
{
this.id = id;
this.name = name;
}
public long getId()
{
return id;
}
public void setId(long id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
}
MyAccount.java:
package com.fetch;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.Collection;
import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.persistence.Entity;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
#WebService()
#Entity
#Table(name = "CUSTOMER")
#Path("/user")
#NamedQuery(name="loginquery", query="select ID,NAME from CUSTOMER")
public class MyAccount
{
private Account ac;
public MyAccount()
{
// TODO Auto-generated constructor stub
ac = new Account();
}
#POST
#Path("/fetch")
#WebMethod(operationName = "insert")
public String insert(#FormParam("name") String name)
{
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/studentinfo", "root", "root");
String query = "insert into CUSTOMER"+"(NAME) VALUES"+"(?)";
PreparedStatement st = con.prepareStatement(query);
st.setString(1,name);
st.executeUpdate();
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
return"Record inserted successfully";
}
public Account getAc()
{
return ac;
}
public void setAc(Account ac)
{
this.ac = ac;
}
}
insert.html:
<!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>
</head>
<body>
<form action="rest/user/fetch" method="POST">
<p>
Name : <input id="name" name="name" />
</p>
<input type="submit" value="Add" />
<input type="submit" value="Retrive" />
</form>
</body>
</html>
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>FetchAndInsert</display-name>
<servlet>
<servlet-name>REST Servlet</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.fetch</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>REST Servlet</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
How to retrieve the data from the database when the user clicks on the retrieve button, and display all the records in another HTML form?
Please give suggestions on how to do it.
In my application, when the user clicks the retrieve button it is performing the insert operation.
But I want is, when the user clicks it should go to the another page and display the data in table from database.
Can anybody tell the mistake what I have done, and give suggestions for finding solution for it and how to display the dynamic table in other page when the user clicks the retrieve button?

Finally I have done it, Now I am able to perform both insertion and retriving of data from database using jersey(JAX - RS) webservices and able to display it in a html page.
Account.java:
package com.fetch;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Id;
public class Account implements Serializable
{
#Id
private long id;
#Column(name = "NAME")
private String name;
public Account(int id, String name)
{
this.id = id;
this.name = name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
MyAccount.java:
package com.fetch;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.persistence.Entity;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
#WebService()
#Entity
#Path("/user")
public class MyAccount
{
#POST
#Path("/fetch")
#WebMethod(operationName = "insert")
public String insert(#FormParam("name") String name)
{
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/studentinfo", "root", "root");
String query = "insert into CUSTOMER"+"(NAME) VALUES"+"(?)";
PreparedStatement st = con.prepareStatement(query);
st.setString(1,name);
st.executeUpdate();
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
return"Record inserted successfully";
}
#GET
#Path("/retrive")
#Produces("text/html")
#WebMethod(operationName = "retrive")
public String retrive()
{
ResultSet rs = null;
String details = "";
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/studentinfo", "root", "root");
String query = "select ID,NAME from CUSTOMER";
PreparedStatement st = con.prepareStatement(query);
rs = st.executeQuery();
details = "<html><body>";
details = details + "<table border=1>";
details = details + "<tr><td><Strong>Id </Strong></td>" +
"<td><Strong>Name </Strong></td>" + "</tr>";
while (rs.next())
{
details = details + "<tr><td>" + rs.getInt("ID") + "</td>" +
"<td>" + rs.getString("NAME") + "</td></tr>";
}
details += "</table></body></html>";
}
catch (Exception e)
{
System.out.println(e.getMessage());
}
return details;
}
}
insert.html:
<!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>
</head>
<body>
<form action="rest/user/fetch" method="POST">
<p>
Name : <input id="name" name="name" />
</p>
<input type="submit" value="Add" />
</form>
<form action="rest/user/retrive" method="GET">
<input type="submit" value="Retrive" />
</form>
</body>
</html>
my web.xml is:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID" version="3.0">
<display-name>FetchAndInsert</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>REST Servlet</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.fetch</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>REST Servlet</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

Jersey doesn't provide any sort of HTML templating. You need to forward your response to a jsp page or use Ajax to fetch the data and lay it out on the page.

We Keep Coding

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

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How to retrieve data from database using webservices (JAX - RS) in eclipse using Java

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