is "StateString" member variable writable? Can I somehow set the StateString to "Started" ?
as you can see by the 'R' in JMX-Console. The StateString only represents the content of 'state' variable as a string.
State itself is also read-only. Its transitions are determined by the transitions of the internal MBean state. Most MBeans expose those transitions by create(),start(),stop(),destroy().
Have a look at http://docs.jboss.org/jbossas/jboss4guide/r5/html/ch2.chapter.html#d0e4449