JMX [MX4J / JDK1.5] - MemoryUsage

JMX [MX4J / JDK1.5] - MemoryUsage

the jvm provides several MemoryMXBeans that provide information about memory usage in form of a MemoryUsage object. the MemoryUsage objects have some properties of type long. i can add the properties as "custom attributes", but they don't seem to be recognized as "numeric", so i can see no chart and i can't enable them for reports.
is there a way to get that working?

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