Name: viR10068 Date: 09/08/2003


The description for the methods MemoryMBean.updateMemoryPools/updateMemoryManagers
says nothing about the java.util.ConcurrentModificationException but the
RI throws it for second call of these methods (MBean access).

So, the RI or spec should be fixed.

This bug causes the failure of the JCK test:
api/java_lang/management/MemoryMBean/index.html#updateMemory

Source code:
=========================== mupdate.java ====================================
import java.io.PrintStream;
import java.lang.management.*;
import javax.management.*;

public class mupdate {

    public static int run(String argv[], PrintStream out) {
        mupdate mupd = new mupdate();
        try {
            System.out.println("Exit code for updateMemory0101 is " +
mupd.updateMemory0101());
            System.out.println("Exit code for updateMemory0101 is " +
mupd.updateMemory0101());
        } catch (RuntimeMBeanException re) {
            System.out.println("Unexpected exception: " + re.getTargetException());
            return 2;
        }
        return 0;
    }

    public static void main(String argv[]) {
        System.exit(run(argv, System.out) + 95/*STATUS_TEMP*/);
    }

    public int updateMemory0101() {
        final ObjectName objName;
        try {
            objName = new ObjectName("java.lang:type=Memory");
        } catch (MalformedObjectNameException me) {
            System.out.println("Unexpected exception: " + me);
            return 2;
        }
        MBeanServer mbs;
        Object [] paramArr = {};
        String [] signArr = {};
        try {
            mbs = MBeanServerFactory.createMBeanServer();
            ManagementFactory.registerMBeans(mbs);
            mbs.invoke(objName, "updateMemoryPools", paramArr, signArr);
// or
// mbs.invoke(objName, "updateMemoryManagers", paramArr, signArr);
            System.out.println("OKAY");
            return 0;
        } catch (JMException je) {
            System.out.println("Unexpected exception: " + je);
            return 2;
        }
    }
}

=======================================================================
Execution log:
% jdk1.5.0-b18/solaris-sparc/bin/javac mupdate.java && jdk1.5.0-b18/solaris-sparc/bin/java
-showversion -Xfuture mupdate
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b18)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b18, mixed mode)

OKAY
Exit code for updateMemory0101 is 0
Unexpected exception: java.util.ConcurrentModificationException
%

======================================================================