Configuring hibernate to connect to the database through JNDI Datasource

Question

Hello everyone. I am using Hibernate + Struts2 + Tomcat6 + Mysql as a J2EE platform. I use hibernate's built-in pooling mechanism, but it turned out that this is a problem when mysql closes its connections after 8 hours. In any case, I did a bit of searching and found that I needed to connect through the JNDI data source, but I could not find a good and complete tutorial on this. What steps should I take to do this? please provide me enough details, I am new to this. here is my hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url"> jdbc:mysql://localhost/hposg?characterEncoding=UTF-8 </property> <property name="connection.username">root</property> <property name="connection.password"></property> <property name="show_sql">true</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <property name="current_session_context_class">thread</property> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <property name="hbm2ddl.auto">update</property> <property name="hibernate.max_fetch_depth">3</property> <property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property> <property name="hibernate.c3p0.acquire_increment">2</property> <property name="hibernate.c3p0.idle_test_period">300</property> <property name="hibernate.c3p0.timeout">1800</property> <property name="hibernate.c3p0.max_size">25</property> <property name="hibernate.c3p0.min_size" >3</property> <property name="hibernate.c3p0.max_statement">0</property> <property name="hibernate.c3p0.preferredTestQuery">select 1;</property> <property name="hibernate.c3p0.testConnectionOnCheckout">true</property> <property name="hibernate.c3p0.validate">true</property> <!-- Mapping files --> <mapping resource="com/hposg/hibernate/resources/Player.hbm.xml"/> <mapping resource="com/hposg/hibernate/resources/Game.hbm.xml"/> ... </session-factory> </hibernate-configuration> 

I tried this too, but that didn't work: Creating a context.xml in WebContent / META-INF containing:

 <Context path="" docBase="../RSGames" debug="0" reloadable="true"> <Resource name="jdbc/RSGames" auth="Container" type="javax.sql.DataSource" username="root" password="" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/hposg?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=utf8" maxActive="15" maxIdle="7" validationQuery="Select 1" /> </Context> 

putting this in web.xml:

 <resource-ref> <description>Connection Pool</description> <res-ref-name>jdbc/RSGames</res-ref-name> <res-type>javax.sql.Datasource</res-type> <res-auth>Container</res-auth> </resource-ref> 

and change the sleep configuration as follows:

 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> ... <property name="connection.datasource">java:comp/env/jdbc/RSGames</property> ... </session-factory> </hibernate-configuration> 

as I mentioned earlier, it does not connect to the database this way. any ideas?

[EDIT] When I run the application, I get this exception:

 Mar 16, 2011 12:29:13 AM com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run WARNING: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1f18cbe -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(Unknown Source) at java.sql.DriverManager.getDriver(Unknown Source) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:224) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:120) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:143) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:132) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547) Mar 16, 2011 12:29:13 AM com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run WARNING: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@14f1726 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(Unknown Source) at java.sql.DriverManager.getDriver(Unknown Source) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:224) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:120) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:143) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:132) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547) Mar 16, 2011 12:29:13 AM com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run WARNING: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@cad437 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(Unknown Source) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(Unknown Source) at java.sql.DriverManager.getDriver(Unknown Source) at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:224) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:120) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:143) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:132) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547) 29994 [http-8081-3] WARN org.hibernate.cfg.SettingsFactory - Could not obtain connection to query metadata java.sql.SQLException: Connections could not be acquired from the underlying database! at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128) at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:78) at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:114) at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2163) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2159) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1383) at com.hposg.hibernate.util.HibernateUtil.buildSessionFactory(HibernateUtil.java:12) at com.hposg.hibernate.util.HibernateUtil.<clinit>(HibernateUtil.java:7) at com.hposg.login.LoginFactory.doLogin(LoginFactory.java:25) at com.hposg.controller.struts.LoginAction.execute(LoginAction.java:59) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441) at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176) at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237) at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488) at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Unknown Source) Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source. at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1319) at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557) at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525) ... 74 more 

Answer 1

Apparently, you did everything right. But here is a list of things you will need with examples from a working application:

1) The context.xml file in META-INF, specifying the data source:

 <Context> <Resource name="jdbc/DsWebAppDB" auth="Container" type="javax.sql.DataSource" username="sa" password="" driverClassName="org.h2.Driver" url="jdbc:h2:mem:target/test/db/h2/hibernate" maxActive="8" maxIdle="4"/> </Context> 

2) web.xml, which tells the container that you are using this resource:

 <resource-env-ref> <resource-env-ref-name>jdbc/DsWebAppDB</resource-env-ref-name> <resource-env-ref-type>javax.sql.DataSource</resource-env-ref-type> </resource-env-ref> 

3) Hibernate configuration that consumes a data source. In this case, it is a persistence.xml , but similar in hibernate.cfg.xml

 <persistence-unit name="dswebapp"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" /> <property name="hibernate.connection.datasource" value="java:comp/env/jdbc/DsWebAppDB"/> </properties> </persistence-unit> 

Answer 2

JNDI Tomcat-7 Configuration:

Steps:

• Open server.xml in tomcat-dir / conf
• Add a <Resource> with your database data inside <GlobalNamingResources>

 <Resource name="jdbc/mydb" global="jdbc/mydb" auth="Container" type="javax.sql.DataSource" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/test" username="root" password="" maxActive="10" maxIdle="10" minIdle="5" maxWait="10000"/> 

3. Save server.xml file
4. Open the .xml context in the tomcat-dir / conf file
5. Add the <ResourceLink> tag to the <Context> .

 <ResourceLink name="jdbc/mydb" global="jdbc/mydb" auth="Container" type="javax.sql.DataSource" /> 

6. Save .xml context
7. Open the hibernate-cfg.xml file and add and remove the properties below.

 Adding: ------- <property name="connection.datasource">java:comp/env/jdbc/mydb</property> Removing: -------- <!--<property name="connection.url">jdbc:mysql://localhost:3306/mydb</property> --> <!--<property name="connection.username">root</property> --> <!--<property name="connection.password"></property> --> 

8. Save the file and put the last .WAR file in tomcat.
9. Restart tomcat. connection to the database will work.

Answer 3

I was getting the same error in my IBM Websphere with jar c3p0 files. I have an Oracle 10g database. I just added the oraclejdbc.jar files to the application server JVM in the IBM Classpath using the Websphere Console, and the error was resolved.

Oraclejdbc.jar should be installed with your C3P0 container files in your server class path, whatever it is, tomcat, glassfish of IBM.

Answer 4

Inside the applicationContext.xml file of the maven Hibernet web application project, I worked under the settings for me.

 <?xml version="1.0" encoding="UTF-8"?> <beans:beans xmlns="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd"> 

  <jee:jndi-lookup id="dataSource" jndi-name="Give_DataSource_Path_From_Your_Server" expected-type="javax.sql.DataSource" /> 

Hope this helps someone. Thank!