src/share/vm/runtime/arguments.hpp

*** 156,165 ****
--- 156,169 ----
    const char* key() const             { return _key; }
    bool internal() const               { return _internal; }
    SystemProperty* next() const        { return _next; }
    void set_next(SystemProperty* next) { _next = next; }
  
+   bool is_readable() const {
+     return !_internal || strcmp(_key, "jdk.boot.class.path.append") == 0;
+   }
+ 
    // A system property should only have its value set
    // via an external interface if it is a writeable property.
    // The internal, non-writeable property jdk.boot.class.path.append
    // is the only exception to this rule.  It can be set externally
    // via -Xbootclasspath/a or JVMTI OnLoad phase call to AddToBootstrapClassLoaderSearch.
*** 746,756 ****
--- 750,762 ----
  
    static void PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v,
                                        PropertyAppendable append, PropertyWriteable writeable,
                                        PropertyInternal internal);
    static const char* PropertyList_get_value(SystemProperty* plist, const char* key);
+   static const char* PropertyList_get_readable_value(SystemProperty* plist, const char* key);
    static int  PropertyList_count(SystemProperty* pl);
+   static int  PropertyList_readable_count(SystemProperty* pl);
    static const char* PropertyList_get_key_at(SystemProperty* pl,int index);
    static char* PropertyList_get_value_at(SystemProperty* pl,int index);
  
    static bool is_internal_module_property(const char* option);