This has been seen once on a windows machine. I re-tried it with the same build and machine, but not reproduced. So probably an one time failure.

----------System.out:(1/11)----------
Test1: OK
----------System.err:(17/948)----------
java.net.SocketTimeoutException: Receive timed out
at java.net.DualStackPlainDatagramSocketImpl.socketReceiveOrPeekData(Native Method)
at java.net.DualStackPlainDatagramSocketImpl.peekData(DualStackPlainDatagramSocketImpl.java:113)
at java.net.DatagramSocket.receive(DatagramSocket.java:724)
at Tests.simpleDataExchange(Tests.java:83)
at UdpTest.test2(UdpTest.java:133)
at UdpTest.main(UdpTest.java:72)
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:484)
at com.sun.javatest.regtest.MainAction$SameVMRunnable.run(MainAction.java:759)
at java.lang.Thread.run(Thread.java:745)

JavaTest Message: Test threw exception: java.net.SocketTimeoutException
JavaTest Message: shutting down test