Hi, I think I've found the reason for this problem. I think it is a bug in combination with richfaces. The error occurd when serving a request for anonymous wrote : /mywebapp/a4j_3_1_1-SNAPSHOTorg/richfaces/renderkit/html/css/modalPanel.xcss/DATB/eAGLZKr5DAADWQHL which is a resource for a richfaces component. As you can see in the stack trace below, this request somehow triggerd the JSF lifecycle, which causes the SeamPhaseListener to run, which again tries to initialize the entity manager, though the conversation context has not been activated yet. SeamManagedEntityManagerFactory.createEntityManager() line: 59 | JpaTransactionManager.createEntityManagerForTransaction() line: 391 | JpaTransactionManager.doBegin(Object, TransactionDefinition) line: 315 | JpaTransactionManager(AbstractPlatformTransactionManager).getTransaction(TransactionDefinition) line: 350 | SpringTransaction.begin() line: 74 | SeamPhaseListener.begin(PhaseId) line: 566 | SeamPhaseListener.handleTransactionsBeforePhase(PhaseEvent) line: 307 | SeamPhaseListener.beforeServletPhase(PhaseEvent) line: 142 | SeamPhaseListener.beforePhase(PhaseEvent) line: 116 | ResourceLifecycle.invokePhaseListener(PhaseListener, PhaseEvent, boolean) line: 201 | ResourceLifecycle.processPhaseListeners(PhaseListener[], PhaseEvent, boolean) line: 177 | ResourceLifecycle.send(ResourceContext, InternetResource) line: 147 | InternetResourceService.load(Object, Object) line: 336 | LRUMapCache.load(Object, Object) line: 116 | LRUMapCache.get(Object, Object) line: 87 | InternetResourceService.serviceResource(String, HttpServletRequest, HttpServletResponse) line: 198 | InternetResourceService.serviceResource(HttpServletRequest, HttpServletResponse) line: 144 | Filter(BaseFilter).doFilter(ServletRequest, ServletResponse, FilterChain) line: 265 | Ajax4jsfFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 60 | SeamFilter$FilterChainImpl.doFilter(ServletRequest, ServletResponse) line: 69 | LoggingFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 58 | SeamFilter$FilterChainImpl.doFilter(ServletRequest, ServletResponse) line: 69 | SeamFilter.doFilter(ServletRequest, ServletResponse, FilterChain) line: 158 | Any comment? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4113972#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...