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I vaguely remembered some option that was required, but that was to monitor
a Java 1.4.1 VM with VisualGC ; [url http://java.sun.com/performance/jvmstat/]jvmstat ^[url http://java.sun.com/performance/jvmstat/]jvmstat^
The instrumented HotSpot JVM ships with J2SE 1.4.2 and later, providing always-on instrumentation. The HotSpot JVM, verion 1.4.1, also includes the the instrumentation, but it must be enabled with the -XX:+UsePerfData flag.