java.io.IOException: Cannot allocate memory

The machine is out of memory.. a Linux top command shows the CPUs are maxing out. Re-boot required.

java.io.IOException: Cannot allocate memory
   at java.lang.UNIXProcess.forkAndExec(Native Method)
   at java.lang.UNIXProcess.(UNIXProcess.java:157)
   at java.lang.ProcHelper.run(ProcHelper.java:60)