Spring DM and RmiProxyFactoryBean

[dlinsin]

Hi there,

I have a Bundle A which uses a Service defined by a Spring-Bean using a RmiProxyFactoryBean. The Service runs on a remote server. I have a Bundle B which contains business object, which are being used by Bundle A (Import-Package) and the remote Service.

When Bundle A calls the remote Service, the remote method is being called and the Service returns the business object. However, when it's being unmarshalled, I get the following Exception:

java.rmi.UnmarshalException: error unmarshalling return; nested exception is: 
	java.lang.ClassNotFoundException: Vertrieb (no security manager: RMI class loader disabled)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:178)
	at org.springframework.remoting.rmi.RmiInvocationWrapper_Stub.invoke(Unknown Source)
	at org.springframework.remoting.rmi.RmiClientInterceptor.doInvoke(RmiClientInterceptor.java:393)
	at org.springframework.remoting.rmi.RmiClientInterceptor.doInvoke(RmiClientInterceptor.java:339)
	at org.springframework.remoting.rmi.RmiClientInterceptor.invoke(RmiClientInterceptor.java:258)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
	at $Proxy7.readAll(Unknown Source)
	at 
....

Caused by: java.lang.ClassNotFoundException: Vertrieb (no security manager: RMI class loader disabled)
	at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:375)
	at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165)
	at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620)
	at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247)
	at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
	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 java.util.ArrayList.readObject(ArrayList.java:593)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1846)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
	at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:155)
	... 96 more

Now I introduced another Bundle B, which wraps a Proxy around the remote Service and simply delegates all calls to the Service. I exposed the interface of Bundle B using osgi:service. Bundle A simply references this service using osgi:reference. Now Bundle A calls Bundle B, which then calls the remote Service and the funny thing is, it works. No Exception!

Any ideas or comments? I suppose it's a classloader issues....

[Costin Leau]

The error indicates the there is no security used and thus the RMI class loader fails. Adding a proxy still depends on RMI which means the same behaviour should apply - however, probably since things are done locally to the RMI bundle, you don't have to expose the internals so much but just a simple interface signature which is already loaded and known to both A and B (and which doesn't require any RMI loading).