src/share/classes/java/util/logging/LoggingProxyImpl.java

*** 97,102 ****
--- 97,107 ----
  
      @Override
      public String getLevelName(Object level) {
          return ((Level) level).getName();
      }
+ 
+     @Override
+     public String getProperty(String key) {
+         return LogManager.getLogManager().getProperty(key);
+     }
  }