| Summary: | Classloader issue for replicated sessions and dynamic proxies | ||
|---|---|---|---|
| Product: | Tomcat 6 | Reporter: | Michael Wyraz <michael> |
| Component: | Catalina | Assignee: | Tomcat Developers Mailing List <dev> |
| Status: | RESOLVED FIXED | ||
| Severity: | critical | ||
| Priority: | P2 | ||
| Version: | unspecified | ||
| Target Milestone: | default | ||
| Hardware: | Other | ||
| OS: | Linux | ||
| Attachments: | Webapp to reproduce the problem | ||
Created attachment 20347 [details]
Webapp to reproduce the problem
Deploy the webapp on a cluster of at least 2 nodes (distributable context,
replicated session). Call one node's url and watch the log of the other.
I have encountered the same problem. Here is my post in the support forum, that includes details, as well as code that can help reproduce the problem. http://www.nabble.com/Problem-serializing-JDK-dynamic-proxies-td16467407.html Hope this helps, Naaman Fixed in trunk http://svn.apache.org/viewvc?view=rev&revision=645184 Will propose backport for 6.0.x branch Filip patch applied to 6.0.x branch, will be available 6.0.17 |
We use 2 tomcats (tomcat 6.0.13) as Cluster with default tcp session replication. Some webapps contains complex session information including dynamic generated proxies. The problem is that the classloader used to deserialize the proxy cannot load any of the proxy interfaces during initialisation. The result is a "ClassNotFoundException" but the interface class is pressent. I will attach a minimal webapp to reproduce the problem. The exception thrown is below. The exception is thrown, when both tomcats are running and the servlet is called on one of them (the other tomcat throws the exception). java.lang.ClassNotFoundException: proxytest.TestProxyInterface at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at java.io.ObjectInputStream.resolveProxyClass(ObjectInputStream.java:676) at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1531) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1493) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.apache.catalina.ha.session.DeltaRequest$AttributeInfo.readExternal(DeltaRequest.java:361) at org.apache.catalina.ha.session.DeltaRequest.readExternal(DeltaRequest.java:255) at org.apache.catalina.ha.session.DeltaManager.deserializeDeltaRequest(DeltaManager.java:619) at org.apache.catalina.ha.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:1363) at org.apache.catalina.ha.session.DeltaManager.messageReceived(DeltaManager.java:1320) at org.apache.catalina.ha.session.DeltaManager.messageDataReceived(DeltaManager.java:1083) at org.apache.catalina.ha.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:87) at org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:916) at org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:897) at org.apache.catalina.tribes.group.GroupChannel.messageReceived(GroupChannel.java:264) at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79) at org.apache.catalina.tribes.group.interceptors.TcpFailureDetector.messageReceived(TcpFailureDetector.java:110) at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79) at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79) at org.apache.catalina.tribes.group.ChannelCoordinator.messageReceived(ChannelCoordinator.java:241) at org.apache.catalina.tribes.transport.ReceiverBase.messageDataReceived(ReceiverBase.java:225) at org.apache.catalina.tribes.transport.nio.NioReplicationTask.drainChannel(NioReplicationTask.java:185) at org.apache.catalina.tribes.transport.nio.NioReplicationTask.run(NioReplicationTask.java:88) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907) at java.lang.Thread.run(Thread.java:619)