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

Caused by: java.lang.ClassCastException: cannot be cast to org.hibernate.dialect.Dialect ---------------------------------------------------------------------------------------- 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 Labels: GWT, hibernate Attachments: classloader.patch, ClassLoaderServiceImplTest.java, ClassLoaderServiceImplTest.java 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