Cannot persist xmbean

[tosca]

Hello!
I used the persistent-service.sar example, made it into a non service jar and deployed it.

I'm able to access the bean from the jmx console, get and set properties, but it is never persisted. Why would that be?

the only changes I made are:

Put this at the beginning of the class
@Service (objectName="jboss.jmx:service=PersistentServiceExample", xmbean="resource:ps-xmbean.xml")

Created ps-xmbean.xml, modified it to confirm to xmbean schema.

Only persistence doesn't work. Any pointer on how to debug would be greatly appreciated.
modified jboss-service.xml (ps-xmbean.xml)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mbean PUBLIC
 "-//JBoss//DTD JBOSS XMBEAN 1.2//EN"
 "http://www.jboss.org/j2ee/dtd/jboss_xmbean_1_2.dtd">
<!-- $Id: jboss-service.xml 23704 2004-09-14 20:29:40Z andd $ -->

<!-- ===================================================================== -->
<!-- -->
<!-- Example Service using "external" XMBean persistence -->
<!-- -->
<!-- ===================================================================== -->




 <!-- Inline xmbean descriptor

 This is a normal XMBean descriptor, the only different being the
 specification of the DelegatingPersistenceManager as a persistence-manager.

 This persistence manager will invoke a factory operations
 (by default apmCreate()) on an external MBean service
 (by default jboss:service=AttributePersistenceService),
 in order to get a reference to an AttributePersistenceManager
 implementation.

 The actual AttributePersistenceManager implementation is instantiated
 by the AttributePersistenceService and shared by many
 DelegatingPersistenceManagers. By default an XMLAttributePersistenceManager
 is instantiated, but other implementations are possible.

 The external AttributePersistenceService can be use to manage at runtime
 the AttributePersistenceManager implementation, i.e. list persisted ids,
 remove persisted images, or specify a particular 'version-tag' for all
 saved information.

 It is important that the external AttributePersistenceService is
 operational when the XMBean that uses it is instantiated. This will
 normally not be a problem since the AttributePersistenceService is most
 probably started by conf/jboss-service.xml
 -->
 <mbean>
 <description>PersistentServiceExample</description>
 <descriptors>
 <persistence persistPolicy="OnUpdate"/>
 <!-- persistLocation is ignored

 persistName="PersistentServiceExample"

 an alternative persistent id may be specified with
 persistName; by default the ObjectName will used -->

 <!-- THIS IS IMPORTANT -->
 <persistence-manager value="org.jboss.mx.persistence.DelegatingPersistenceManager"/>

 <!-- May use a different external AttributePersistenceService; default should be ok.
 <descriptor name="attribute-persistence-service" value="jboss:service=AttributePersistenceService"/>
 <descriptor name="attribute-persistence-operation" value="apmCreate"/>
 -->
 </descriptors>
 <class>org.jboss.jmx.examples.persistence.PersistentServiceExample</class>

 <!-- Attributes -->

 <attribute access="read-write" getMethod="getSomeBigDecimal" setMethod="setSomeBigDecimal">
 <name>SomeBigDecimal</name>
 <type>java.math.BigDecimal</type>
 </attribute>

 <attribute access="read-write" getMethod="isSomeBoolean" setMethod="setSomeBoolean">
 <name>SomeBoolean</name>
 <type>boolean</type>
 </attribute>

 <!-- This is an XML element -->
 <attribute access="read-write" getMethod="getSomeElement" setMethod="setSomeElement">
 <name>SomeElement</name>
 <type>org.w3c.dom.Element</type>
 </attribute>

 <!-- We can specify that an attribute is never persisted
 If we remove the "persistPolicy" - "Never" descriptor we'll
 probably get a warning since the java.io.FileDescriptor
 cannot be persisted. Try it! -->
 <attribute access="read-write" getMethod="getSomeFileDescriptor" setMethod="setSomeFileDescriptor">
 <name>SomeFileDescriptor</name>
 <type>java.io.FileDescriptor</type>
 <descriptors>
 <descriptor name="persistPolicy" value="Never"/>
 </descriptors>
 </attribute>

 <!-- primitive types (e.g. int) are boxed during persistence
 (e.g java.lang.Integer) -->
 <attribute access="read-write" getMethod="getSomeInt" setMethod="setSomeInt">
 <name>SomeInt</name>
 <type>int</type>
 </attribute>

 <attribute access="read-write" getMethod="getSomeInteger" setMethod="setSomeInteger">
 <name>SomeInteger</name>
 <type>java.lang.Integer</type>
 </attribute>

 <attribute access="read-write" getMethod="getSomeString" setMethod="setSomeString">
 <name>SomeString</name>
 <type>java.lang.String</type>
 </attribute>

 <attribute access="read-write" getMethod="getSomeTimestamp" setMethod="setSomeTimestamp">
 <name>SomeTimestamp</name>
 <type>java.sql.Timestamp</type>
 <descriptors>
 <descriptor name="currencyTimeLimit" value="10"/>
 </descriptors>
 </attribute>

 <attribute access="read-write" getMethod="getSomeNullObject" setMethod="setSomeNullObject">
 <name>SomeNullObject</name>
 <type>java.lang.Object</type>
 </attribute>

 <!-- Again, although the java.util.ArrayList is Serializable,
 it cannot be persisted in this case because it contains
 non-serializable content -->
 <attribute access="read-write" getMethod="getSomeArrayList" setMethod="setSomeArrayList">
 <name>SomeArrayList</name>
 <type>java.util.ArrayList</type>
 <descriptors>
 <descriptor name="persistPolicy" value="Never"/>
 </descriptors>
 </attribute>

 </mbean>