problem with MX4J, JAVA 5.0, dynamic mbeans

How do I force the application to use mx4j instead of JMX shipped with java
5.0?

I tried putting MX4j in the bootclasspath but I am getting following error
while creating the mbeanserver
java.lang.Error: java.lang.NullPointerException
        at mx4j.server.MBeanMetaData$Factory.create(MBeanMetaData.java:180)
        at mx4j.server.MX4JMBeanServer.createMBeanMetaData(
MX4JMBeanServer.java:755)
        at mx4j.server.MX4JMBeanServer.registerMBeanImpl(
MX4JMBeanServer.java:740)
        at mx4j.server.MX4JMBeanServer.access$000(MX4JMBeanServer.java:100)
        at mx4j.server.MX4JMBeanServer$3.run(MX4JMBeanServer.java:772)
        at java.security.AccessController.doPrivileged(Native Method)
        at mx4j.server.MX4JMBeanServer.privilegedRegisterMBean(
MX4JMBeanServer.java:768)
        at mx4j.server.MX4JMBeanServer.<init>(MX4JMBeanServer.java:176)
        at mx4j.server.MX4JMBeanServerBuilder.newMBeanServer(
MX4JMBeanServerBuilder.java:53)
        at javax.management.MBeanServerFactory.createMBeanServerImpl(
MBeanServerFactory.java:209)
        at javax.management.MBeanServerFactory.createMBeanServer(
MBeanServerFactory.java:46)
        at com.aciworldwide.es.mgmt.ACIJMXServer.main(ACIJMXServer.java:94)

I also tried using -
Djavax.management.builder.initial=mx4j.server.MX4JMBeanServerBuilder with
out putting mx4j classes them in the case path, now it comes up propertly
(using the MX4J class to create the mbeanserver, I guess) , but is it not
all replacing all JAVA 5.0 JMX classes with MX4J classes. i.e it is not
using the MX4J implementation of RequiredModelMBean class.

In short how do I force the application to use mx4j instead of Java
5.0JMX.  If that is not possible, is there any way to force the
application to
use MX4J implementation of RequiredModelMBean instead of Java 5.0implemenataion.

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