Why my persistent MBean does not persist attribute value changes?

The 1st thing to check is that you have configured your MBean to

be persistent using the XMBean deployment descriptor. The minimum

requirement is to define a persistPolicy and a persistence-manager, e.g:

<xmbean>
   <description>PersistentServiceExample</description>
   <descriptors>
      <persistence persistPolicy="OnUpdate"></persistence>
      <persistence-manager value="org.jboss.mx.persistence.DelegatingPersistenceManager"></persistence-manager>
   </descriptors>
   <class>org.jboss.jmx.examples.persistence.PersistentServiceExample</class>
   ...

The next thing to make sure is that you do not specify in the mbean

descriptor attribute overrides for attributes that you want to be persistent.

The reason is that, those attribute overrides take place after the

persisted values are reloaded to the MBean upon start-up, so the persisted

changes are lost. To avoid this, you should move the attribute overrides

from the mbean descriptor to the xmbean descriptor, using the <value> tag

(see HowCanIInitializeXMBeanAttributes).

The 3rd thing to check is that the persistent attribute value changes

take place through the MBeanServer, so that the persistence interceptor

can kick-in and do its job. If the MBean changes its own attributes,

or someone updates the attributes through a direct reference to the

MBean, then those changes are not persisted.

Finally, you need to make sure you are not trying to persist attributes that

cannot be persisted. For example, the XMLAttributePersistenceManager will

persist attribute types for which a PropertyEditor exists or they are

Serializable.

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