setRollbackOnly is not working

[linux__rulez]

In the implemention of an MDB I stumble on something that I really did not expect, maybe someone can tell me where I go wrong?
I,
-declared Container Tx in ejb-jar.xml on my MDB
-inside the onMessage(Message) method I check some values which make me
-want to call setRollBackOnly()

Then I get an IllegalStateException from JBoss with this text:

00:26:11,653 ERROR [LogInterceptor] RuntimeException in method: public abstract void javax.jms.MessageListener.onMessage(javax.jms.Message):
java.lang.IllegalStateException: setRollbackOnly should not be access for user managed Tx
 at org.jboss.ejb.MessageDrivenEnterpriseContext$MessageDrivenContextImpl.setRollbackOnly(MessageDrivenEnterpriseContext.java:202)
 at bank.ejb.TransactionManagerMBean.onMessage(TransactionManagerMBean.java:123)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
<SNAP>

setRollbackOnly should not be access for user managed Tx

It comes from this piece of sourcecode:

<<<<<<<<<<<<<SNAP>>>>>>>>>>>>>>
 /**
 * If transaction type is not Container or there is no transaction
 * then throw an exception.
 *
 * @throws IllegalStateException If transaction type is not Container,
 * or no transaction.
 */
 public void setRollbackOnly()
 {
 if (isUserManagedTx())
 throw new IllegalStateException("setRollbackOnly should not be access for user managed Tx");

 AllowedOperationsAssociation.assertAllowedIn("getRollbackOnly",
 IN_BUSINESS_METHOD | IN_EJB_TIMEOUT);

 if (!isTxRequired()) {
 throw new IllegalStateException
 ("setRollbackOnly must only be called in the context of a transaction (EJB 2.0 - 15.5.1)");
 }

 super.setRollbackOnly();
 }

 /** Helper to check if the tx type is TX_REQUIRED. */
 private boolean isTxRequired()
 {
 MessageDrivenMetaData md = (MessageDrivenMetaData)con.getBeanMetaData();
 return md.getMethodTransactionType() == MetaData.TX_REQUIRED;
 }
 }

This is my ejb-jar.xml

<<<<<<<<<<<<<<SNAP>>>>>>>>>>>>
 <message-driven>
 <ejb-name>TransactionManagerMBean</ejb-name>
 <ejb-class>bank.ejb.TransactionManagerMBean</ejb-class>
 <transaction-type>Bean</transaction-type>
 <message-driven-destination>
 <destination-type>javax.jms.Queue</destination-type>
 </message-driven-destination>
 <ejb-local-ref>
 <ejb-ref-name>ejb/AccountBean</ejb-ref-name>
 <ejb-ref-type>Entity</ejb-ref-type>
 <local-home>bank.ejb.AccountLHome</local-home>
 <local>bank.ejb.Account</local>
 <ejb-link>AccountBean</ejb-link>
 </ejb-local-ref>
 <ejb-local-ref>
 <ejb-ref-name>ejb/TransactionBean</ejb-ref-name>
 <ejb-ref-type>Entity</ejb-ref-type>
 <local-home>bank.ejb.TransactionLHome</local-home>
 <local>bank.ejb.Transaction</local>
 <ejb-link>TransactionBean</ejb-link>
 </ejb-local-ref>
 </message-driven>
 </enterprise-beans>

 <assembly-descriptor>
 <container-transaction>
 <method>
 <ejb-name>TransactionManagerMBean</ejb-name>
 <method-name>*</method-name>
 </method>
 <trans-attribute>Required</trans-attribute>
 </container-transaction>
 </assembly-descriptor>

I know I must be wrong, but where?

Thanks for any hints in advance,

Johannes

[genman]

 <transaction-type>Bean</transaction-type>

change to Container

[linux__rulez]

of course, thanks!