FULL PRODUCT VERSION :
java version "1.5.0_07"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-b03)
Java HotSpot(TM) Client VM (build 1.5.0_07-b03, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
The MemoryUsage.from(CompositeData) method allows invalid "init" values that the MemoryUsage(int,int,int,int) constructor doesn't.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.lang.management.MemoryUsage;

import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.OpenType;
import javax.management.openmbean.SimpleType;

public class MemoryUsageTest {

    public static void main(String[] args) throws Exception {
        try {
            MemoryUsage mu = new MemoryUsage(-2, 2048, 4096, 8128);
            System.err.println("FAILED - Illegal init value did not cause exception");
        } catch (IllegalArgumentException e) {
            System.err.println("PASSED - Illegal init value caused exception");
        }

        // construct MemoryUsage from CompositeData
        String[] itemNames = { "init", "used", "committed", "max" };
        Object[] items = { Long.valueOf(1024), Long.valueOf(2048), Long.valueOf(4096),
                Long.valueOf(8128) };
        CompositeType muType = new CompositeType(MemoryUsage.class.getName(),
                "memory usage snapshot", itemNames, itemNames, new OpenType[] {
                        SimpleType.LONG, SimpleType.LONG, SimpleType.LONG, SimpleType.LONG });
        CompositeData cd = new CompositeDataSupport(muType, itemNames, items);

        try {
            MemoryUsage mu = MemoryUsage.from(cd);
            System.err.println("FAILED - Illegal init value did not cause exception");
        } catch (IllegalArgumentException e) {
            System.err.println("PASSED - Illegal init value caused exception");
        }
    }

}
---------- END SOURCE ----------