[hibernate-issues] [Hibernate-JIRA] Created: (HHH-7084) Caused by: java.lang.ClassCastException: cannot be cast to org.hibernate.dialect.Dialect

[Artem V. Navrotskiy (JIRA)]

Caused by: java.lang.ClassCastException: cannot be cast to org.hibernate.dialect.Dialect
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                 Key: HHH-7084
                 URL: https://hibernate.onjira.com/browse/HHH-7084
             Project: Hibernate ORM
          Issue Type: Bug
          Components: core
    Affects Versions: 4.1.0
         Environment: Idea 11.0.02, JDK 7, GWT 2.4.0 Dev Mode, Hibernate 4.0.0+
            Reporter: Artem V. Navrotskiy
         Attachments: classloader.patch

If you run GWT application from JetBrains Idea in Dev Mode, GWT builds custom ClassLoader.
When Hibernate creates of any object by it's name (Dialect for example), if class available for SystemClassLoader it's will be created by SystemClassLoader. Not by a current ClassLoader.
This is due to the fact that the class ClassLoaderServiceImpl$1 uses SystemClassLoader as parent ClassLoader.

Stacktrace:

javax.persistence.PersistenceException: Unable to build EntityManagerFactory
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:889)
	at ru.buzzsoft.common.HibernateHelper.createEntityManagerFactory(HibernateHelper.java:180)
	at ru.buzzsoft.delivery.PersistentFactory.getEntityPersonalFactory(PersistentFactory.java:21)
	at ru.buzzsoft.delivery.server.api.impl.ContextImpl.<init>(ContextImpl.java:126)
	at ru.buzzsoft.delivery.server.api.impl.ContextImpl.<init>(ContextImpl.java:89)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at java.lang.Class.newInstance0(Class.java:372)
	at java.lang.Class.newInstance(Class.java:325)
	at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
	at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:253)
	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
	at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:616)
	at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
	at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
	at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513)
	at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
	at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468)
	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
	at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115)
	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
	at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
	at org.mortbay.jetty.Server.doStart(Server.java:222)
	at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
	at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672)
	at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
	at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
	at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
	at com.google.gwt.dev.DevMode.main(DevMode.java:311)
Caused by: org.hibernate.HibernateException: Could not instantiate dialect class
	at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.constructDialect(DialectFactoryImpl.java:82)
	at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:64)
	at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:146)
	at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
	at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)
	at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2273)
	at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2269)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1738)
	at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:88)
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904)
	... 32 more
Caused by: java.lang.ClassCastException: org.hibernate.dialect.H2Dialect cannot be cast to org.hibernate.dialect.Dialect
	at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.constructDialect(DialectFactoryImpl.java:73)
	... 43 more


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