Thanks, I added backport jar to my testing lib, and openejb works fine. What confused me is my ear without this jar can still work fine in the Weblogic server (and I searched Weblogic and I didn't find a backport jar there). Could it be the way HibernatePersistence invoked by openejb somehow different from when it's loaded from the server that made the difference? I agree with you on Hibernate/EHCache seems to be using it of course. Regards, - John
________________________________ From: David Blevins [mailto:david.blev...@visi.com] Sent: Mon 10/25/2010 5:22 PM To: users@openejb.apache.org Subject: Re: how to adjust classpath - version 3.1.2 Trimmed down the stack trace to the 'Caused by' clause and it looks Hibernate/EHCache related. On Oct 25, 2010, at 1:28 PM, Yu, Xiaohui wrote: > Caused by: java.lang.NoClassDefFoundError: > edu/emory/mathcs/backport/java/util/concurrent/BlockingQueue > > at > net.sf.ehcache.config.ConfigurationHelper.createCache(ConfigurationHelper.java:401) > > at > net.sf.ehcache.config.ConfigurationHelper.createDefaultCache(ConfigurationHelper.java:334) > > at net.sf.ehcache.CacheManager.configure(CacheManager.java:293) > > at net.sf.ehcache.CacheManager.init(CacheManager.java:225) > > at net.sf.ehcache.CacheManager.<init>(CacheManager.java:212) > > at net.sf.ehcache.CacheManager.create(CacheManager.java:381) > > at > net.sf.ehcache.hibernate.SingletonEhCacheProvider.start(SingletonEhCacheProvider.java:123) > > at > org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.start(RegionFactoryCacheProviderBridge.java:72) > > at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:215) > > at > org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327) > > at > org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867) > > at > org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669) > > at > org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:132) > > at > org.apache.openejb.assembler.classic.PersistenceBuilder.createEntityManagerFactory(PersistenceBuilder.java:185) > > at > org.apache.openejb.assembler.classic.Assembler.createApplication(Assembler.java:490) > > ... 31 more My guess is you need this jar: http://backport-jsr166.sourceforge.net <http://backport-jsr166.sourceforge.net/> We used to include that in 3.1.2 as it was needed by ActiveMQ 4. Now we use ActiveMQ 5 and that jar is no longer required for any code we ship, but it looks like Hibernate still uses it via EHCache. -David
