java/net/httpclient/security/Security.java fails intermittently with BindException:

----------System.err:(32/1837)----------
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at Security.directProxyTest(Security.java:325)
at Security.lambda$setupTests$10(Security.java:228)
at Security.runtest(Security.java:347)
at Security.main(Security.java:382)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:520)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:92)
at java.lang.Thread.run(Thread.java:804)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:426)
at Security.getProxy(Security.java:145)
at Security.directProxyTest(Security.java:320)
... 9 more
Caused by: java.net.BindException: Address already in use
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:442)
at java.net.ServerSocket.bind(ServerSocket.java:376)
at java.net.ServerSocket.<init>(ServerSocket.java:238)
at java.net.ServerSocket.<init>(ServerSocket.java:130)
at ProxyServer.<init>(ProxyServer.java:51)
... 15 more