int identifyPidOrNot() {
    try {
      return identifyPid();
    } catch (PidUnavailableException handled) {
      return -1;
    }
  }
Gets the version of GemFire currently running.

@return a String representation of GemFire's version.
geode-core/src/main/java/org/apache/geode/distributed/AbstractLauncher.java