src/share/vm/runtime/java.hpp

*** 137,146 ****
--- 137,154 ----
  
    static JDK_Version jdk_update(uint8_t major, uint8_t update_number) {
      return JDK_Version(major, 0, 0, update_number);
    }
    
+   static JDK_Version undefined() {
+     return JDK_Version(0);
+   }
+   
+   bool is_undefined() const {
+     return (_major == 0);
+   }
+ 
    uint8_t major_version() const          { return _major; }
    uint8_t minor_version() const          { return _minor; }
    uint8_t micro_version() const          { return _micro; }
    uint8_t update_version() const         { return _update; }
    uint8_t special_update_version() const { return _special; }