j2se/src/share/classes/sun/tools/jconsole/resources/JConsoleResources.java
              :
         {"Connect", "Connect", 'C'},
              :
         {"Password: ", "Password: ", 'P'},

It seems that the third element above means the mnemonic character but
the mnemonic implementation using ListResourceBundle should be commonly
expected the key-value pairs like below.

              :
         {"jconsole.connect", "Connect"},
         {"jconsole.connect.mnemonic", new Integer(KeyEvent.VK_C)},
              :
         {"jconsole.password", "Password: "},
         {"jconsole.password.mnemonic", new Integer(KeyEvent.VK_P)},