Hi, I got the error below on Jboss 5.0.1 (MacOS X). I searched google and found http://www.jboss.org/index.html?module=bb&op=viewtopic&t=145941&a... But to change the values UseJBossWebloader=true and CallByValue = true, didn't help. So does anybody have an hint on that? 20:20:01,832 ERROR [FieldBeanProperty] failed to set value Proxy to jboss.j2ee:jar=TwitterPoCEJB.jar,name=TweetViewerBean,service=EJB3 implementing [interface org.jboss.ejb3.proxy.intf.EjbProxy, interface org.jboss.ejb3.proxy.intf.StatefulSessionProxy, interface de.brotkasting.buki.cep.beans.TwitterSessionBeanRemote, interface org.jboss.ejb3.proxy.intf.SessionProxy] on field private de.brotkasting.buki.cep.beans.TwitterSessionBean de.brotkasting.buki.cep.servlets.TweetViewerServlet.bean; Reason: ClassLoaders of value and target are not equal java.lang.IllegalArgumentException at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63) at java.lang.reflect.Field.set(Field.java:656) at org.jboss.injection.lang.reflect.FieldBeanProperty.set(FieldBeanProperty.java:74) at org.jboss.injection.JndiPropertyInjector.inject(JndiPropertyInjector.java:119) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processInjectors(TomcatInjectionContainer.java:380) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:259) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1006) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:777) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:613) 20:20:01,833 INFO [[/TwitterClient]] Marking servlet TweetViewerServlet as unavailable 20:20:01,834 ERROR [[TweetViewerServlet]] Allocate exception for servlet TweetViewerServlet java.lang.IllegalArgumentException: failed to set value Proxy to jboss.j2ee:jar=TwitterPoCEJB.jar,name=TweetViewerBean,service=EJB3 implementing [interface org.jboss.ejb3.proxy.intf.EjbProxy, interface org.jboss.ejb3.proxy.intf.StatefulSessionProxy, interface de.brotkasting.buki.cep.beans.TwitterSessionBeanRemote, interface org.jboss.ejb3.proxy.intf.SessionProxy] on field private de.brotkasting.buki.cep.beans.TwitterSessionBean de.brotkasting.buki.cep.servlets.TweetViewerServlet.bean; Reason: ClassLoaders of value and target are not equal at org.jboss.injection.lang.reflect.FieldBeanProperty.set(FieldBeanProperty.java:99) at org.jboss.injection.JndiPropertyInjector.inject(JndiPropertyInjector.java:119) at org.jboss.web.tomcat.service.TomcatInjectionContainer.processInjectors(TomcatInjectionContainer.java:380) at org.jboss.web.tomcat.service.TomcatInjectionContainer.newInstance(TomcatInjectionContainer.java:259) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1006) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:777) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:129) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:613) Best regards, Andreas View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4220394#... 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