I upgraded from M4 to M5a using http://download.jboss.org/jbosstools/builds/development/3.3.0.M5a.core/2011-12-14_19-42-13-H61. When opening the "Session Factory" in the Hibernate Console I get the following stacktrace:

!ENTRY org.hibernate.eclipse.console 4 4 2011-12-16 10:24:32.898
!MESSAGE Problems while creating sessionfactory
!SUBENTRY 1 org.hibernate.eclipse.console 4 150 2011-12-16 10:24:32.898
!MESSAGE org.hibernate.HibernateException: could not instantiate RegionFactory []
!STACK 0
org.hibernate.HibernateException: could not instantiate RegionFactory []
at org.hibernate.cfg.SettingsFactory.createRegionFactory(SettingsFactory.java:432)
at org.hibernate.cfg.AnnotationBinder.determineCacheConcurrencyStrategy(AnnotationBinder.java:1039)
at org.hibernate.cfg.AnnotationBinder.buildCacheMock(AnnotationBinder.java:1009)
at org.hibernate.cfg.AnnotationBinder.determineCacheSettings(AnnotationBinder.java:966)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:576)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3395)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3349)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1323)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1713)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0$1.execute(HibernateExtension4_0.java:143)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:63)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0.execute(HibernateExtension4_0.java:248)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0.buildSessionFactory(HibernateExtension4_0.java:135)
at org.hibernate.console.ConsoleConfiguration.buildSessionFactory(ConsoleConfiguration.java:273)
at org.hibernate.eclipse.console.workbench.LazySessionFactoryAdapter.getChildren(LazySessionFactoryAdapter.java:43)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.getChildren(BasicWorkbenchAdapter.java:100)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.fetchDeferredChildren(BasicWorkbenchAdapter.java:106)
at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:235)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.ClassNotFoundException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)
at org.hibernate.cfg.SettingsFactory.createRegionFactory(SettingsFactory.java:417)
... 18 more
!SUBENTRY 2 org.hibernate.eclipse.console 4 150 2011-12-16 10:24:32.898
!MESSAGE org.hibernate.HibernateException: could not instantiate RegionFactory []
!STACK 0
org.hibernate.HibernateException: could not instantiate RegionFactory []
at org.hibernate.cfg.SettingsFactory.createRegionFactory(SettingsFactory.java:432)
at org.hibernate.cfg.AnnotationBinder.determineCacheConcurrencyStrategy(AnnotationBinder.java:1039)
at org.hibernate.cfg.AnnotationBinder.buildCacheMock(AnnotationBinder.java:1009)
at org.hibernate.cfg.AnnotationBinder.determineCacheSettings(AnnotationBinder.java:966)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:576)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3395)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3349)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1323)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1713)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0$1.execute(HibernateExtension4_0.java:143)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:63)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0.execute(HibernateExtension4_0.java:248)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0.buildSessionFactory(HibernateExtension4_0.java:135)
at org.hibernate.console.ConsoleConfiguration.buildSessionFactory(ConsoleConfiguration.java:273)
at org.hibernate.eclipse.console.workbench.LazySessionFactoryAdapter.getChildren(LazySessionFactoryAdapter.java:43)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.getChildren(BasicWorkbenchAdapter.java:100)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.fetchDeferredChildren(BasicWorkbenchAdapter.java:106)
at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:235)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.ClassNotFoundException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)
at org.hibernate.cfg.SettingsFactory.createRegionFactory(SettingsFactory.java:417)
... 18 more
!SUBENTRY 2 org.hibernate.eclipse.console 4 150 2011-12-16 10:24:32.898
!MESSAGE java.lang.ClassNotFoundException:
!STACK 0
java.lang.ClassNotFoundException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)
at org.hibernate.cfg.SettingsFactory.createRegionFactory(SettingsFactory.java:417)
at org.hibernate.cfg.AnnotationBinder.determineCacheConcurrencyStrategy(AnnotationBinder.java:1039)
at org.hibernate.cfg.AnnotationBinder.buildCacheMock(AnnotationBinder.java:1009)
at org.hibernate.cfg.AnnotationBinder.determineCacheSettings(AnnotationBinder.java:966)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:576)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3395)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3349)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1323)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1713)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0$1.execute(HibernateExtension4_0.java:143)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:63)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0.execute(HibernateExtension4_0.java:248)
at org.jboss.tools.hibernate4_0.HibernateExtension4_0.buildSessionFactory(HibernateExtension4_0.java:135)
at org.hibernate.console.ConsoleConfiguration.buildSessionFactory(ConsoleConfiguration.java:273)
at org.hibernate.eclipse.console.workbench.LazySessionFactoryAdapter.getChildren(LazySessionFactoryAdapter.java:43)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.getChildren(BasicWorkbenchAdapter.java:100)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.fetchDeferredChildren(BasicWorkbenchAdapter.java:106)
at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:235)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)