Chris Stepnitz [http://community.jboss.org/people/cstepnitz] created the discussion
"JBoss 5.0 and 5.1 MySql-Hibernate Dialect Class Cast error--works in JBoss 4.2.3" To view the discussion, visit: http://community.jboss.org/message/548056#548056 -------------------------------------------------------------- Hi, I'm trying to migrate my application to JBoss 5.1 or JBoss 5.0.1 from JBoss 4.2.3, and I'm having some issues with the hibernate-to-mysql database connection. Both new versions of JBoss give me the same error, while the same configuration works in JBoss 4.2.3. In short, I've successfully set up a data source connection and jndi name for my war to a local mysql database. My app itself uses hibernate to 'talk' to the database, and on deployment I get a ClassCast exception stating that the default MySql dialect doesn't extend the right class (but it does!). "Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQLDialect cannot be cast to org.hibernate.dialect.Dialect" I'm mystified. Any guesses? Details below. *Stack Trace:* 08:32:31,453 INFO [Version] Hibernate Commons Annotations 3.1.0.GA 08:32:31,453 INFO [Version] Hibernate EntityManager 3.4.0.GA 08:32:31,500 INFO [Ejb3Configuration] Processing PersistenceUnitInfo [ name: MyPersistence ...] 08:32:31,546 WARN [Ejb3Configuration] Persistence provider caller does not impl ement the EJB3 spec correctly. PersistenceUnitInfo.getNewTempClassLoader() is null. 08:32:31,625 INFO [HibernateSearchEventListenerRegister] Unable to find org.hibernate.search.event.FullTextIndexEventListener on the classpath. Hibernate Search is not enabled. 08:32:31,640 INFO [InjectedDataSourceConnectionProvider] Using provided datasource 08:32:32,093 ERROR [AbstractKernelController] Error installing to Start: name=persistence.unit:unitName=#MyPersistence state=Create javax.persistence.PersistenceException: [PersistenceUnit: MyPersistence] Unable to build EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:132) at org.jboss.jpa.deployment.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:301) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.reflect.plugins.introspection.ReflectionUtils.invoke(ReflectionUtils.java:59) at org.jboss.reflect.plugins.introspection.ReflectMethodInfoImpl.invoke(ReflectMethodInfoImpl.java:150) at org.jboss.joinpoint.plugins.BasicMethodJoinPoint.dispatch(BasicMethodJoinPoint.java:66) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction$JoinpointDispatchWrapper.execute(KernelControllerContextAction.java:241) at org.jboss.kernel.plugins.dependency.ExecutionWrapper.execute(ExecutionWrapper.java:47) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchExecutionWrapper(KernelControllerContextAction.java:109) at org.jboss.kernel.plugins.dependency.KernelControllerContextAction.dispatchJoinPoint(KernelControllerContextAction.java:70) at org.jboss.kernel.plugins.dependency.LifecycleAction.installActionInternal(LifecycleAction.java:221) at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:54) at org.jboss.kernel.plugins.dependency.InstallsAwareAction.installAction(InstallsAwareAction.java:42) at org.jboss.dependency.plugins.action.SimpleControllerContextAction.simpleInstallAction(SimpleControllerContextAction.java:62) at org.jboss.dependency.plugins.action.AccessControllerContextAction.install(AccessControllerContextAction.java:71) at org.jboss.dependency.plugins.AbstractControllerContextActions.install(AbstractControllerContextActions.java:51) at org.jboss.dependency.plugins.AbstractControllerContext.install(AbstractControllerContext.java:348) at org.jboss.dependency.plugins.AbstractController.install(AbstractController.java:1631) at org.jboss.dependency.plugins.AbstractController.incrementState(AbstractController.java:934) [CUT HERE FOR LENGTH] Caused by: org.hibernate.HibernateException: Could not instantiate dialect class at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:84) at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:66) at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39) at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:426) at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:128) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2073) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1298) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669) ... 61 more Caused by: java.lang.ClassCastException: org.hibernate.dialect.MySQLDialect cannot be cast to org.hibernate.dialect.Dialect at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:78) ... 69 more 08:32:34,234 INFO [TomcatDeployment] deploy, ctxPath=/myCtx 08:33:03,250 INFO [[/myCtx]] Initializing log4j from [classpath:log4j.xml] 08:33:03,281 INFO [[/myCtx]] Initializing Spring root WebApplicationContext *My Data Source:* <?xml version="1.0" encoding="UTF-8"?> <datasources> <local-tx-datasource> <jndi-name>MyPersistence</jndi-name> <jta-data-source>MyPersistence</jta-data-source> <connection-url>jdbc:mysql://localhost:3306/myApp</connection-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <user-name>FAKEUSER</user-name> <password>FAKEPASSWORD</password> <min-pool-size>5</min-pool-size> <max-pool-size>20</max-pool-size> <idle-timeout-minutes>0</idle-timeout-minutes> <track-statements/> <application-managed-security/> <prepared-statement-cache-size>32</prepared-statement-cache-size> </local-tx-datasource> </datasources> *My Persistence.xml in my.war* <persistence xmlns=" /java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence" version="1.0"> <persistence-unit transaction-type="JTA"> <jta-data-source>java:/MyPersistence</jta-data-source> </persistence-unit> </persistence> -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/548056#548056] Start a new discussion in Datasource Configuration at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2077]
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