JVM appears hung: Timed out waiting for signal from JVM. error in Jetty server

ERROR  | wrapper  | 2014/06/04 15:53:55.147 | JVM appears hung: Timed out waiting for signal from JVM.

ERROR  | wrapper  | 2014/06/04 15:53:55.585 | JVM did not exit on request, terminated STATUS | wrapper  | 2014/06/04 15:54:01.163 | Launching a JVM...