Java RMI not closing socket after lease expiration

Question

My RMI enabled application seems to be leaking sockets. I have a Java application providing a service over RMI. It is using the Java SE 1.6 RMI implementation running on Linux

Answer 1

public class MySocketFactorySettingKeepAlive ... {
  // overwrite createSocket methods, call super.createSocket, add keepAlive
}

Socket.setSocketImplFactory(youFactoryDemandingKeepAlive);

and then just use RMI.

The trick, if I remember right, is to manage to set the factory before the system opens first socket -- Java disallows to overwrite the factory; in worst case, use reflection to overwrite it :))) (kidding; would be a hack)

Also, you may need to allow specific operation in SecurityManager.