A DESCRIPTION OF THE PROBLEM :
A CompositeData contains a null value element, MemoryUsage.from(CompositeData) throws NPE.



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import javax.management.openmbean.*;
import java.lang.management.MemoryUsage;

public class MemoryUsageCompositeData {
    public static void main(String[] argv) throws Exception {
        String[] names = {"committed", "init", "max", "used"};
        CompositeData cd = new CompositeDataSupport(
            new CompositeType("MemoryUsage", "MemoryUsage composite type", names, names,
                new OpenType[]{SimpleType.LONG, SimpleType.LONG, SimpleType.LONG, SimpleType.LONG}),
            names,
            new Object[]{null, 1024L, 10240L, 2048L});
        MemoryUsage.from(cd);
    }
}
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