Hi, I'm usign 4.0.5/EJB3 and an independent Tomcat 5.5 Ububntu 5-10 java 1.5.08. Using StatelessSessionBean with a BusinessDelegate as a facade. Every now an then, sometimes after re-deploying, sometimes after restarting jboss, a call to Business-Method (isUserAuthorized) from my tomcat application (web-service) gives this error Caused by: java.lang.ClassCastException: isoa.users.bean.UserContext | at $Proxy15.isUserAuthorized(Unknown Source) | at isoa.users.bean.UsersServiceBd$3.run(UsersServiceBd.java:91) | at isoa.commons.bean.AbstractBizDelegate$EjbRun.runWithRetries(AbstractBizDelegate.java:150) | ... 37 more UserContext class is in the class-path, I checked the version is always the same in my client and in my server, etc., etc..., all seems pretty ok. Sometimes after calling the method a second time or just re-deploying begins to work OK again. Any Idea where to look for, or what is happening Thanks in advance tonio View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3994031#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...