The following piece of Java code is enough to understand the problem.
Side effect is the user can not discriminate case the mbeanServer argument is faked from the 3 cases listed below.


/* COPY/PASTE OF THE JAVADOC OF javax/management.MBeanServerFactory.releaseMBeanServer()

releaseMBeanServer

public static void releaseMBeanServer(MBeanServer mbeanServer)

    Remove internal MBeanServerFactory references to a created MBeanServer. This allows the garbage collector to remove the MBeanServer object.

    Parameters:
        mbeanServer - the MBeanServer object to remove.
    Throws:
        java.lang.IllegalArgumentException - if mbeanServer was not generated by one of the createMBeanServer methods, or if releaseMBeanServer was already called on it.
        java.lang.SecurityException - if there is a SecurityManager and the caller's permissions do not include or imply MBeanServerPermission("releaseMBeanServer").
*/


import javax.management.* ;

public class MBS
{
    public void run(String args[]) {
            MBeanServer mbs = MBeanServerFactory.newMBeanServer() ;
            
            try {
                System.out.println("1 - release called after new") ;
                MBeanServerFactory.releaseMBeanServer(mbs) ;
                System.out.println("I did not receive any IllegalArgumentException ==> BUG") ;
            } catch(Exception e) {
                e.printStackTrace() ;
            }
            
            try {
                System.out.println("2 - release called twice after new") ;
                MBeanServerFactory.releaseMBeanServer(mbs) ;
                System.out.println("I did not receive any IllegalArgumentException ==> BUG") ;
            } catch(Exception e) {
                e.printStackTrace() ;
            }
            
            MBeanServer mbs2 = MBeanServerFactory.createMBeanServer() ;
            
            try {
                System.out.println("3 - release called twice after create") ;
                MBeanServerFactory.releaseMBeanServer(mbs2) ;
                MBeanServerFactory.releaseMBeanServer(mbs2) ;
                System.out.println("3 did not receive any IllegalArgumentException ==> BUG") ;
            } catch(Exception e) {
                e.printStackTrace() ;
            }
    }
    
    
    public static void main (String args[]) {
        MBS instance = new MBS();
        instance.run(args);
    }
}