Hello everyone We are having an issue where we have a class that is an entry point to RMI (an rmi proxy). As such, it deserializes remote objects before passing them to the appropriate entity. However, this generic "gate-keeper" is throwing an ClassNotFoundException since it doesn't have a wire for the class that it is trying to deserialize
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: java.lang.ClassNotFoundException: com.foo.SupportedCommand at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:354) at sun.rmi.transport.Transport$1.run(Transport.java:178) at sun.rmi.transport.Transport$1.run(Transport.java:175) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:174) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276) at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162) at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:194) at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:148) at com.sun.proxy.$Proxy1.setParameter(Unknown Source) at com.foo.proxy.GenericProxy.setParameter at com.foo.proxy.AlarmManager$3.setParameter at com.foo.proxy.AlarmManager$3.run at com.foo.ThreadPool$PooledThread.run Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: java.lang.ClassNotFoundException: com.foo.SupportedCommand at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:314) at sun.rmi.transport.Transport$1.run(Transport.java:178) at sun.rmi.transport.Transport$1.run(Transport.java:175) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:174) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ClassNotFoundException: com.foo.SupportedCommand at java.net.URLClassLoader$1.run(URLClassLoader.java:372) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:340) at com.foo.rmi.LoaderHandler.loadClass at com.foo.rmi.LoaderHandler.loadClass at com.foo.rmi.ClassLoaderProvider.loadClass at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:264) at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:214) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371) at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:326) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:308) ... 10 more We hacked it by adding an explicit import-package in the bundle of the proxy to com.foo since it is the package that contains SupportedCommand; it works, but maintaining an explicit list of import-packages is always a red-flag to me since it seems error-prone and a pain to maintain in the long run. So I'm wondering what is the clean way to do this. It seems that the model of static import-package doesn't work well in such a bundle (i.e. the bundle that contains and RMI proxy which should be allowed to know any class that might come via RMI), is this a justified case for a dynamicImport-package or is there a better idiom for these cases?? I would appreciate any thoughts on this, how have others solved this issue? Thank you, Alejandro DISCLAIMER: Privileged and/or Confidential information may be contained in this message. If you are not the addressee of this message, you may not copy, use or deliver this message to anyone. In such event, you should destroy the message and kindly notify the sender by reply e-mail. It is understood that opinions or conclusions that do not relate to the official business of the company are neither given nor endorsed by the company. Thank You.
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