Hi Guys! I am importing lot of assets to guvnor using rest API. And sometimes I get the following error: 02:33:14,718 WARN [org.apache.jackrabbit.core.session.SessionState] (http--0.0.0.0-8080-80) Attempt to perform session.save() while another thread is concurrently writing to session-guest-3. Blocking until the other thread is finished using this session. Please review your code to avoid concurrent use of a session.: java.lang.Exception: Stack trace of concurrent access to session-guest-3 at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:147) [jackrabbit-core-2.2.8.jar:2.2.8] at org.apache.jackrabbit.core.SessionImpl.perform(SessionImpl.java:355) [jackrabbit-core-2.2.8.jar:2.2.8] at org.apache.jackrabbit.core.SessionImpl.save(SessionImpl.java:758) [jackrabbit-core-2.2.8.jar:2.2.8] at org.drools.repository.RulesRepository.save(RulesRepository.java:1405) [guvnor-repository-5.4.0.Final.jar:5.4.0.Final] at org.drools.guvnor.server.jaxrs.PackageResource.updateAssetBinary(PackageResource.java:791) [guvnor-webapp-core-5.4.0.Final.jar:5.4.0.Final] at sun.reflect.GeneratedMethodAccessor97.invoke(Unknown Source) [:1.7.0_21] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_21] at java.lang.reflect.Method.invoke(Method.java:601) [rt.jar:1.7.0_21] at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:173) [cxf-rt-core-2.4.4.jar:2.4.4] at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:89) [cxf-rt-core-2.4.4.jar:2.4.4] at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:164) [cxf-rt-frontend-jaxrs-2.4.4.jar:2.4.4] at org.apache.cxf.jaxrs.JAXRSInvoker.invoke(JAXRSInvoker.java:91) [cxf-rt-frontend-jaxrs-2.4.4.jar:2.4.4] at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58) [cxf-rt-core-2.4.4.jar:2.4.4] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_21] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [rt.jar:1.7.0_21] at java.util.concurrent.FutureTask.run(FutureTask.java:166) [rt.jar:1.7.0_21] at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37) [cxf-rt-core-2.4.4.jar:2.4.4] at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:106) [cxf-rt-core-2.4.4.jar:2.4.4] at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263) [cxf-api-2.4.4.jar:2.4.4] at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:121) [cxf-rt-core-2.4.4.jar:2.4.4] at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:206) [cxf-rt-transports-http-2.4.4.jar:2.4.4] at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:209) [cxf-rt-transports-http-2.4.4.jar:2.4.4] at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:152) [cxf-rt-transports-http-2.4.4.jar:2.4.4] at org.apache.cxf.transport.servlet.CXFNonSpringServlet.invoke(CXFNonSpringServlet.java:114) [cxf-rt-transports-http-2.4.4.jar:2.4.4] at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:184) [cxf-rt-transports-http-2.4.4.jar:2.4.4] at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPut(AbstractHTTPServlet.java:124) [cxf-rt-transports-http-2.4.4.jar:2.4.4] at javax.servlet.http.HttpServlet.service(HttpServlet.java:757) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final] at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:163) [cxf-rt-transports-http-2.4.4.jar:2.4.4] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] at org.jboss.solder.servlet.exception.CatchExceptionFilter.doFilter(CatchExceptionFilter.java:65) [solder-impl-3.1.1.Final.jar:3.1.1.Final] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] at org.jboss.solder.servlet.event.ServletEventBridgeFilter.doFilter(ServletEventBridgeFilter.java:74) [solder-impl-3.1.1.Final.jar:3.1.1.Final] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:] at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:] at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:] at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_21] Does someone know how guvnor manages JCR sessions, and/or if there is a potential bug somewhere? Thanks! Demian -- View this message in context: http://drools.46999.n3.nabble.com/Problem-importing-assets-using-REST-API... Sent from the Drools: User forum mailing list archive at Nabble.com.