rmi in Netscape 3.x

I have an applet that use rmi. I use JDK 1.0.2 plus latest rmi for 1.0.2. My applet run perfectly with the applet viewer. But when trying to laod in Netscape 3.0.1 I got those exception...

# Security Exception: properties
# Security Exception: properties
# Security Exception: properties
# Security Exception: properties
# Security Exception: properties
# Security Exception: properties
# Security Exception: properties
# Security Exception: properties
# Applet exception: error: java.lang.NoClassDefFoundError
java.lang.NoClassDefFoundError
  at java.io.ObjectOutputStream.writeObject(Compiled Code)
  at sun.rmi.registry.RegistryImpl_Stub.lookup(Compiled Code)
  at java.rmi.Naming.lookup(Compiled Code)
  at domtar.client.rmiClient.<init>(Compiled Code)
  at Client.init(Compiled Code)
  at netscape.applet.EmbeddedAppletFrame.run(Compiled Code)
  at java.lang.Thread.run(Compiled Code)

When I try to run it on Netscape 4.0b3 I got different exception. The Security Exception: properties line is no there.

Is it possible to run rmi on a Netscape?