FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
3.11.0-17-generic #31-Ubuntu SMP Mon Feb 3 21:52:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
If the com.sun.management.jmxremote.rmi.port option is provided it will give a NPE if already in use by a different JVM. Its expected to fail but should provide an appropriate exception.

REGRESSION. Last worked in version 1.0

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run two instances in different JVMs at same time with the following options:

-Dcom.sun.management.jmxremote.port=2222 -Dcom.sun.management.jmxremote.rmi.port=2223 -Dcom.sun.management.jmxremote.authenticate=false


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Error given port already in use like when jmxremote.port is:

Error: Exception thrown by the agent : java.rmi.server.ExportException: Port already in use: 2223
ACTUAL -
Error: Exception thrown by the agent : java.lang.NullPointerException


ERROR MESSAGES/STACK TRACES THAT OCCUR :
Error: Exception thrown by the agent : java.lang.NullPointerException


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class Test {
public static void main(String[] args) throws Exception {
Thread.sleep(100000);
}
}
---------- END SOURCE ----------