This has been seen on Solaris 10 x64 environment.
According with the test output, it looks to need "whoami".
----------System.err:(29/1589)----------
java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:286)
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:155)
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:147)
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)
Caused by: java.lang.RuntimeException: java.io.IOException: Cannot run program "whoami": error=2, No such file or directory
at InfoTest.<clinit>(InfoTest.java:68)
... 10 more
Caused by: java.io.IOException: Cannot run program "whoami": error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1056)
at InfoTest.<clinit>(InfoTest.java:61)
... 10 more
Caused by: java.io.IOException: error=2, No such file or directory
at java.lang.ProcessImpl.forkAndExec(Native Method)
at java.lang.ProcessImpl.<init>(ProcessImpl.java:315)
at java.lang.ProcessImpl.start(ProcessImpl.java:264)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:1035)
... 11 more

On SOlaris, whoami is under /user/ucb/, which could be not in the PATH by default. There is another choice is 'who am i'. '/bin/who' is usually in PATH.