java/rmi/server/Unreferenced/leaseCheckInterval/LeaseCheckInterval.java fails intermittently with Port already in use

----------System.err:(19/1222)----------

Regression test for bug 4285878

exported remote object
java.lang.RuntimeException: TEST FAILED: unexpected exception: java.rmi.server.ExportException: Port already in use: 6513; nested exception is:
java.net.BindException: Address already in use
at LeaseCheckInterval.main(LeaseCheckInterval.java:117)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:502)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:92)
at java.lang.Thread.run(Thread.java:745)

JavaTest Message: Test threw exception: java.lang.RuntimeException: TEST FAILED: unexpected exception: java.rmi.server.ExportException: Port already in use: 6513; nested exception is:
java.net.BindException: Address already in use
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: TEST FAILED: unexpected exception: java.rmi.server.ExportException: Port already in use: 6513; nested exception is: java.net.BindException: Address already in use