We Keep Coding

Error while getting connections from JDBC template

I'm using tomcat 8 and and deployed the ANT build war file to the tomcat which was previously deployed on Weblogic. I have sorted out most the things and deployment is success too on tomcat locally. However, when i'm trying to test the application thru Postman scripts, I'm having trouble getting the DB connections. The Error is as below:
Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create JDBC driver of class '' for connect URL 'null'
org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:573)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:637)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:662)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:142)
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:148)
//Later part of the error logs:
--------------------------------
Caused by: java.sql.SQLException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:2224)
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2104)
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1563)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
... 53 more
Caused by: java.lang.NullPointerException
at oracle.jdbc.driver.OracleDriver.acceptsURL(OracleDriver.java:981)
at java.sql.DriverManager.getDriver(DriverManager.java:299)
at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:2209)
... 57 more
Please help me to understand where the problem is. My configurations are as below:
web.xml:
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/MatchDS_DEV</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
Context.xml : under tomcat/webapp/manager
<Context antiResourceLocking="false" privileged="true" >
<Valve className="org.apache.catalina.valves.RemoteAddrValve"
allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1" />
<Resource name="jdbc/DEV" auth="Container" type="javax.sql.DataSource"
maxTotal="100" maxIdle="30" maxWaitMillis="10000"
username="USER"
password="Admin_1"
driverClassName="oracle.jdbc.xa.client.OracleXADataSource"
url="jdbc:oracle:thin:#//mcpsecv01-***/MCPRM01V"/>
</Context>
DAO Class:
import javax.sql.DataSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
Class XX{
DataSource dataSource;
private NamedParameterJdbcTemplate jdbcTemplate;
public void setDataSource(DataSource dataSource)
{
jdbcTemplate = new NamedParameterJdbcTemplate(dataSource);
}
//more source code
//within a method, m calling this jdbcTemplate like this:
Object value = jdbcTemplate.query(params); // this is where it throws error.
//more source code
}//End of class X
I have placed below jars in tomcat/lib:
ojdbc14 , spring-jdbc-3.2.0.RELEASE , commons-dbcp2-2.1.1

Datasource Connection with Standalone Java Application

I have been able to configure my datasource in a web app but am unable to replicate that in a stand alone app.
Datasource is configured as server.xml file in tomcat server in config folder. How can I load the datasource from this file in a stand alone Java application?
If I try with
Context initialContext = new InitialContext();
DataSource dataSource = (DataSource) csDBEnvContext.lookup(DATASOURCE_NAME);
Its gives the following exception:
javax.naming.NoInitialContextException: Need to specify class name in
environment or system property, or as an applet parameter, or in an
application resource file: java.naming.factory.initial
Same code when tried using web application is executed fine.
username, password are redacted since it is production environment.
Here is the jdbc.java :
public static void main(String[] args) throws Exception {
Context initContext = new InitialContext();
Context envContext = (Context) initContext.lookup("java:comp/env");
DataSource ds = (DataSource) envContext.lookup("jdbc/haryana");
//Connection conn = ds.getConnection();
try {
DatabaseMetaData dataSource = null;
conn = ds.getConnection();
} catch (Exception e) {
System.out.println("Exception while getting local JDBC Connection getLogsJdbcConnection(): " + e.getMessage());
}
Context.xml :
<Context crossContext="true">
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<Resource name="jdbc/haryana" auth="Container"
type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="postgres"
password="postgres"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://localhost:5432/fps_ws_db_feb17"/>
</Context>
web.xml file :
<resource-ref>
<description>Database connection resource</description>
<res-ref-name>jdbc/haryana</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
can anyone please help me to rectify the this Exception.

Unable to get jndi data source

Unable to get jndi data source.
Error :
javax.naming.NameNotFoundException: Name [jdbc/MyLocalDB] is not bound in this Context. Unable to find [jdbc]
Environment : netbeans 8.0 + tomcat 8 + jdk8
In tomcat server at /conf/context.xml added below block:
<Resource name="jdbc/MyLocalDB"
global="jdbc/MyDB"
type="javax.sql.DataSource" auth="Container"/>
In tomcat server at /conf/server.xml added below block:
<Resource name="jdbc/MyDB"
global="jdbc/MyDB"
type="javax.sql.DataSource"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://localhost:5432/ARBADMIN"
username="postgres"
password="postgres"
maxActive="100"
maxIdle="20"
minIdle="5"
maxWait="10000"/>
Kept postgresql-9.3-1103.jdbc3 to tomcat /lib folder
Java code :
ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("java:/comp/env/jdbc/MyLocalDB");
con = ds.getConnection();
stmt = con.createStatement();
In netbeans ide whether i need to do any thing?

Tomcat war deployed via IntelliJ IDEA 13 is returning error

I'm getting the following error deploying my first WAR file in IntelliJ. It is a local issue, supposedly, as this is just a WAR file we deploy to test our setup.
All 80 Maven tests are passing, but when I browse to the web app, I get this error:
java.lang.IllegalArgumentException: javax.naming.NameNotFoundException: Name [jdbc/ipam] is not bound in this Context. Unable to find [jdbc].
com.myapp1.ipam.rest.JaxRsApplication.<init>(JaxRsApplication.java:26)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.lang.reflect.Constructor.newInstance(Constructor.java:526)
org.glassfish.hk2.utilities.reflection.ReflectionHelper.makeMe(ReflectionHelper.java:1104)
org.jvnet.hk2.internal.Utilities.justCreate(Utilities.java:902)
org.jvnet.hk2.internal.ServiceLocatorImpl.create(ServiceLocatorImpl.java:872)
org.jvnet.hk2.internal.ServiceLocatorImpl.createAndInitialize(ServiceLocatorImpl.java:964)
org.jvnet.hk2.internal.ServiceLocatorImpl.createAndInitialize(ServiceLocatorImpl.java:956)
org.glassfish.jersey.server.ApplicationHandler.createApplication(ApplicationHandler.java:336)
org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:315)
org.glassfish.jersey.server.ApplicationHandler.<init>(ApplicationHandler.java:285)
org.glassfish.jersey.servlet.WebComponent.<init>(WebComponent.java:310)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:170)
org.glassfish.jersey.servlet.ServletContainer.init(ServletContainer.java:358)
javax.servlet.GenericServlet.init(GenericServlet.java:158)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:745)
This seems to be where the problem lies:
public JaxRsApplication() {
DataSource datasource;
try {
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
datasource = (DataSource) envCtx.lookup("jdbc/ipam");
} catch (NamingException e) {
throw new IllegalArgumentException(e);
}
this.init(new SystemConfiguration(datasource));
}
This is my first time using IntelliJ, and I am new to Java, so I'm not sure what to do here.
Here is context-fragment.xml
<?xml version='1.0' encoding='utf-8'?>
<Context>
<Resource name="jdbc/ipam"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
auth="Container"
type="javax.sql.DataSource"
initialSize="2"
maxActive="5"
maxIdle="5"
minIdle="1"
maxWait="10000"
removeAbandoned="true"
removeAbandonedTimeout="60"
logAbandoned="true"
defaultReadOnly="false"
username="**********"
password="**********"
driverClassName="org.postgresql.Driver"
validationQuery="select 1"
validationQueryTimeout="5"
logValidationErrors="true"
testOnBorrow="true"
testWhileIdle="true"
url="jdbc:postgresql://db1host/ipam_dev_table_here"/>
</Context>

Make sure that you have setup IntelliJ to deploy the context.xml file when it starts tomcat. You can do this by
Select "Project Structure" from the File menu
From there, select the "Facets" option. Make sure that you have a Web facet configured. If not, add one.
Once the web facet is added, select "Add Application Server specific descriptor..."
Select Tomcat Context Descriptor from the options and click OK.
By default IntelliJ will point to META-INF/context.xml. If this is not the location of your context file, you will need to edit the Path to the file.

SEVERE: Unable to create initial connections of pool - tomcat 7 with context.xml file

I tried to run project on tomcat 7.0.52 and initialize to DB through context.xml file.
But it throws bunch of exceptions, I couldn't figure out what is wrong there.
Here is console output:
java.sql.SQLException: com.mysql.jdbc.Driver
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254)
at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)
at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635)
at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:486)
at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:144)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103)
at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:554)
at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:242)
at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:141)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
Here is full stack trace.
Here is output to tomcat catalina log
snippet of web.xml:
<resource-ref>
<description>Travel Agency Datasource</description>
<res-ref-name>jdbc/onlinedb</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
context.xml:
<Context>
<Resource name="jdbc/onlinedb"
type="javax.sql.DataSource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
maxActive="20" maxIdle="10"
maxWait="-1"
username="root"
password="secret"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/travelagency?characterEncoding=utf8"/>
</Context>
ConnectionManager class:
public class ConnectionManager {
private static Logger log = Logger.getLogger(ConnectionManager.class);
public static Connection getConnection() throws SQLException {
Connection con = null;
try {
Context initContext = new InitialContext();
Context envContext = (Context) initContext.lookup("java:/comp/env");
DataSource datasource = (DataSource) envContext.lookup("jdbc/onlinedb");
con = datasource.getConnection();
} catch (NamingException e) {
log.error(e);
}
return con;
}
}
mysql-connector-java-5.1.27-bin.jar is added to cp:
I tried to change content of context.xml file:
<resource-env-ref>
<description>Travel Agency Datasource</description>
<resource-env-ref-name>jdbc/onlinedb</resource-env-ref-name>
<resource-env-ref-type>javax.sql.DataSource</resource-env-ref-type>
</resource-env-ref>
But it keep failing.
How to solve this trouble?

You have to add a MySQL jdbc driver to the classpath.
Either put a MySQL binary jar to tomcat lib folder or add it to we application WEB-INF/lib folder.
You can find binary jar (Change version accordingly): https://mvnrepository.com/artifact/mysql/mysql-connector-java/5.1.27

When you encounter exceptions like this, the most useful information is generally at the bottom of the stacktrace:
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
...
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246)
The problem is that Tomcat can't find com.mysql.jdbc.Driver. This is usually caused by the JAR containing the MySQL driver not being where Tomcat expects to find it (namely in the webapps/<yourwebapp>/WEB-INF/lib directory).

I use sprint-boot (2.1.1), and mysql version is 8.0.13. I add dependency in pom, solve my problem.
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.13</version>
</dependency>
MySQL Connector/J » 8.0.13 link: https://mvnrepository.com/artifact/mysql/mysql-connector-java/8.0.13
MySQL Connector/J » All the version link:
https://mvnrepository.com/artifact/mysql/mysql-connector-java

I have also dealt with this exception after a fully working context.xml setup was adjusted. I didn't want environment details in the context.xml, so I took them out and saw this error. I realized I must fully create this datasource resource in code based on System Property JVM -D args.
Original error with just user/pwd/host removed:
org.apache.tomcat.jdbc.pool.ConnectionPool init
SEVERE: Unable to create initial connections of pool.
Removed entire contents of context.xml and try this:
Initialize on startup of app server the datasource object sometime before using first connection. If using Spring this is good to do in an #Configuration bean in #Bean Datasource constructor.
package to use: org.apache.tomcat.jdbc.pool.*
PoolProperties p = new PoolProperties();
p.setUrl(jdbcUrl);
p.setDriverClassName(driverClass);
p.setUsername(user);
p.setPassword(pwd);
p.setJmxEnabled(true);
p.setTestWhileIdle(false);
p.setTestOnBorrow(true);
p.setValidationQuery("SELECT 1");
p.setTestOnReturn(false);
p.setValidationInterval(30000);
p.setValidationQueryTimeout(100);
p.setTimeBetweenEvictionRunsMillis(30000);
p.setMaxActive(100);
p.setInitialSize(5);
p.setMaxWait(10000);
p.setRemoveAbandonedTimeout(60);
p.setMinEvictableIdleTimeMillis(30000);
p.setMinIdle(5);
p.setLogAbandoned(true);
p.setRemoveAbandoned(true);
p.setJdbcInterceptors(
"org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;"+
"org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer");
org.apache.tomcat.jdbc.pool.DataSource ds = new org.apache.tomcat.jdbc.pool.DataSource();
ds.setPoolProperties(p);
return ds;