I am trying to understand the scenarios which could lead to javassist throwing the following error: 2009-07-27 15:49:32,094 INFO [STDOUT] 15:49:32,091 ERROR [BasicLazyInitializer] Javassist Enhancement failed: com.edg.quote.model.SimultaneousFee java.lang.RuntimeException: java.lang.IllegalArgumentException at javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:356) at javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:339) at javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:312) at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:271) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxyFactory(JavassistLazyInitializer.java:138) at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:42) at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:162) at org.hibernate.tuple.entity.AbstractEntityTuplizer.(AbstractEntityTuplizer.java:135) at org.hibernate.tuple.entity.PojoEntityTuplizer.(PojoEntityTuplizer.java:55) at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.(EntityEntityModeToTuplizerMapping.java:56) at org.hibernate.tuple.entity.EntityMetamodel.(EntityMetamodel.java:295) at org.hibernate.persister.entity.AbstractEntityPersister.(AbstractEntityPersister.java:434) at org.hibernate.persister.entity.SingleTableEntityPersister.(SingleTableEntityPersister.java:109) at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55) at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:226) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1300) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33) at com.edg.quote.dao.hibernate.DaoImpl.read(DaoImpl.java:29) at com.edg.quote.generator.States.(States.java:21) at com.edg.quote.generator.StatesFactory.getStates(StatesFactory.java:7) at com.edg.quote.services.ZipResource.validateZip(ZipResource.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:117) at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:260) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:232) at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:166) at org.jboss.resteasy.core.DispatcherUtilities.getJaxrsResponse(DispatcherUtilities.java:142) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:173) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:595) Caused by: java.lang.IllegalArgumentException at sun.reflect.UnsafeStaticObjectFieldAccessorImpl.set(UnsafeStaticObjectFieldAccessorImpl.java:61) at java.lang.reflect.Field.set(Field.java:656) at javassist.util.proxy.ProxyFactory.setField(ProxyFactory.java:352) ... 56 more View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4246769#... 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