Online user guide of jconsole points incorrect link. REPRODUCE: (1) run jconsole in windows(japanese) (2) Select [help]-[Online user guide] - JDK6u45 Expected : http://docs.oracle.com/javase/6/docs/technotes/guides/management/jconsole.html Actual : http://www.oracle.com/technetwork/java/index.html - JDK7u21 Expected : http://docs.oracle.com/javase/7/docs/technotes/guides/management/jconsole.html Actual : http://docs.oracle.com/javase/6/docs/technotes/guides/management/jconsole.html (This is for JDK6ux, not for JDK7ux)