public static String getVersion() {
    return System.getProperty("java.vm.vendor", "UNKNOWN_VM_VENDOR") + ' '
      + System.getProperty("java.version", "UNKNOWN_JAVA_VERSION") + '-'
      + System.getProperty("java.vm.version", "UNKNOWN_VM_VERSION");
  }
Return the current JVM version information.
hbase-server/src/main/java/org/apache/hadoop/hbase/util/JvmVersion.java