com/sun/jndi/rmi/registry/RegistryContext/ContextWithNullProperties.java failed in Mach5 with following error message:

java.rmi.server.ExportException: Port already in use: 64684; nested exception is:
java.net.BindException: Address already in use
at sun.rmi.transport.tcp.TCPTransport.listen(java.rmi@9-ea/TCPTransport.java:336)
at sun.rmi.transport.tcp.TCPTransport.exportObject(java.rmi@9-ea/TCPTransport.java:244)
at sun.rmi.transport.tcp.TCPEndpoint.exportObject(java.rmi@9-ea/TCPEndpoint.java:411)
at sun.rmi.transport.LiveRef.exportObject(java.rmi@9-ea/LiveRef.java:147)
at sun.rmi.server.UnicastServerRef.exportObject(java.rmi@9-ea/UnicastServerRef.java:206)
at sun.rmi.registry.RegistryImpl.setup(java.rmi@9-ea/RegistryImpl.java:157)
at sun.rmi.registry.RegistryImpl.<init>(java.rmi@9-ea/RegistryImpl.java:142)
at java.rmi.registry.LocateRegistry.createRegistry(java.rmi@9-ea/LocateRegistry.java:203)
at TestLibrary.createRegistryOnUnusedPort(TestLibrary.java:412)
at ContextWithNullProperties.main(ContextWithNullProperties.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(java.base@9-ea/Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(java.base@9-ea/NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(java.base@9-ea/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@9-ea/Method.java:531)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:226)
at java.lang.Thread.run(java.base@9-ea/Thread.java:804)
Caused by: java.net.BindException: Address already in use
at java.net.PlainSocketImpl.socketBind(java.base@9-ea/Native Method)
at java.net.AbstractPlainSocketImpl.bind(java.base@9-ea/AbstractPlainSocketImpl.java:442)
at java.net.ServerSocket.bind(java.base@9-ea/ServerSocket.java:376)
at java.net.ServerSocket.<init>(java.base@9-ea/ServerSocket.java:238)
at java.net.ServerSocket.<init>(java.base@9-ea/ServerSocket.java:130)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createServerSocket(java.rmi@9-ea/RMIDirectSocketFactory.java:45)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createServerSocket(java.rmi@9-ea/RMIMasterSocketFactory.java:341)
at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(java.rmi@9-ea/TCPEndpoint.java:666)
at sun.rmi.transport.tcp.TCPTransport.listen(java.rmi@9-ea/TCPTransport.java:325)
... 15 more

JavaTest Message: Test threw exception: java.rmi.server.ExportException
JavaTest Message: shutting down test