The MBeanServer implementation class in Java DMK implements the JdmkMBeanServer and MBServerInt interfaces if the property javax.management.builder.initial has been set to use com.sun.jdmk.JdmkMBeanServerBuilder. This implementation of MBeanServer wraps the JMX MBean server.
The older MBeanServerInt interface and the MBeanServerImpl class are still implemented for reasons of backwards compatibility, but in Java DMK 5.1, JdmkMBeanServer is the prefered interface.
The MBeanServerFactory makes the agent application independent of the MBean server implementation, and thus allows applications to provide custom MBeanServer implementations. It resides in the Java virtual machine and centralizes all MBean server instantiation. The MBeanServerFactory class provides two static methods:
createMBeanServer returns a new MBean server instance.
findMBeanServer returns a list of MBean servers in the Java virtual machine.
You must use the MBeanServerFactory classes to create an MBean server so that other objects can obtain its reference by calling the findMBeanServer method. This method enables dynamically loaded objects to find the MBean server in an agent that has already been started.