[CXF-2145] Proxy in JCA connector throws exception due to concurrency issues

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1, 2.0.6, 2.2
• Fix Version/s: 2.0.11, 2.1.5, 2.2.1
• Component/s: Integration
• Assignee: Daniel Kulp
• Reporter: Seumas Soltysik
• Created: 31/Mar/09 18:03
• Updated: 24/Apr/09 21:17
• Resolved: 03/Apr/09 19:05

Description

A customer is having a problem with concurrent access to a JCA endpoint that is deployed in WebSphere. The stacktrace is below.
They are running a 2.0.x version of CXF with WebSphere 6.1.0.19, HP/UX version B.11.23, Java 1.5.0.13 .

The problem is that the JCA connector uses a single MDB/EJB proxy for all threads which is causing the exception to be thrown. The solution is to create a pool of proxies which can be accessed so that the proxy is used by no more than 1 thread at a time.

[3/10/09 15:55:19:685 EDT] 0000042f DispatchMDBIn E Failed to obtain service object java:comp/env/GreeterWithWsdlLocalHome
java.lang.IllegalStateException: Multiple threads can not use same MessageEndpoint proxy instance concurrently
at com.ibm.ejs.container.MessageEndpointHandler.throwIllegalStateException(MessageEndpointHandler.java:599)
at com.ibm.ejs.container.MessageEndpointHandler.checkState(MessageEndpointHandler.java:433)
at com.ibm.ejs.container.MessageEndpointHandler.invokeMdbMethod(MessageEndpointHandler.java:889)
at com.ibm.ejs.container.MessageEndpointHandler.invoke(MessageEndpointHandler.java:747)
at $Proxy50.lookupTargetObject(Unknown Source)
at org.apache.cxf.jca.inbound.DispatchMDBInvoker.getServiceObject(DispatchMDBInvoker.java:57)
at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:51)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:56)
at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37)
at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:92)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:221)
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:77)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.serviceRequest(JettyHTTPDestination.java:280)
at org.apache.cxf.transport.http_jetty.JettyHTTPDestination.doService(JettyHTTPDestination.java:254)
at org.apache.cxf.transport.http_jetty.JettyHTTPHandler.handle(JettyHTTPHandler.java:70)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)