I have discovered some issues with the latest release of Oracle(BEA) Weblogic Server. First issue is with jpa example. There is already related JIRA issue https://jira.jboss.org/jira/browse/JBSEAM-3350 Second issue is with seam jee5 booking example. After reading steps at http://docs.jboss.com/seam/2.1.0.BETA1/reference/en-US/html/weblogic.html..., which are basically for 10.0MP1, but should work also for version 10.3. And also It seems that some weird class loading issue happens in WLS. Caused by: java.lang.Throwable: Substituted for missing class org.hibernate.HibernateException - Could not instantiate TransactionManagerLookup 'WeblogicTransactionManagerLookup' at org.hibernate.transaction.TransactionManagerLookupFactory.getTransactionManagerLookup(TransactionManagerLookupFactory.java:47) at org.hibernate.cfg.SettingsFactory.createTransactionManagerLookup(SettingsFactory.java:422) at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:140) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:915) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:730) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127) at weblogic.deployment.PersistenceUnitInfoImpl.createEntityManagerFactory(PersistenceUnitInfoImpl.java:330) at weblogic.deployment.PersistenceUnitInfoImpl.<init>(PersistenceUnitInfoImpl.java:123) at weblogic.deployment.AbstractPersistenceUnitRegistry.storeDescriptors(AbstractPersistenceUnitRegistry.java:331) at weblogic.deployment.AbstractPersistenceUnitRegistry.loadPersistenceDescriptor(AbstractPersistenceUnitRegistry.java:245) at weblogic.deployment.ModulePersistenceUnitRegistry.<init>(ModulePersistenceUnitRegistry.java:63) at weblogic.ejb.container.deployer.EJBModule.setupPersistenceUnitRegistry(EJBModule.java:209) at weblogic.ejb.container.deployer.EJBModule$1.execute(EJBModule.java:310) at weblogic.deployment.PersistenceUnitRegistryInitializer.setupPersistenceUnitRegistries(PersistenceUnitRegistryInitializer.java:62) at weblogic.servlet.internal.WebAppModule.prepare(WebAppModule.java:381) -- Marek Novotny -- JBoss Seam Product Lead Red Hat Czech s.r.o. Purkynova 99 612 45 Brno Email: mnovotny(a)redhat.com Office phone: +420 532 294 287, ext. 82-62 087 mobile: +420 608 509 230