Hi...
I'm quite a newbie to jboss (and j2ee in general), and am having no end of
trouble getting started:
I'm attempting to create a state machine using a number of entity beans:
State, Transition, and ProcessInstance. The ProcessInstance bean
represents an actual instantiation of the state machine. State consists of
some state data, together with a collection of transitions, and transition
consists of a source state, a target state, and a list of validators.
ProcessInstance contains a reference to the current state.
Using xdoclet, I ended up with the jbosscmp-jdbc.xml file shown at the end
of this message (I'm getting an error trying to attach files). When I
attempt to deploy my code with this file, I end up getting a
javax.management.InstanceAlreadyExistsException exception. If I remove the
<relationships> section of the file, the code deploys OK, but then does
not work as desired. I use xdoclet tags similar to the following:
@ejb:relation name="CurrentState-relation"
role-name="current-state"
target-role-name="the-state"
target-ejb="State"
target-multiple="yes"
(I've also tried adding @jboss:relation tags, with no luck)
to indicate that the currentState for a processInstance is a
unidirectional relationship, and that many processInstances could point to
one state. This relation appears in my ProcessInstance file. I have
similar tags to deal with states and processes, with one bidirectional
relation indicating that a transition's source state can hold many
transitions.
As you may be able to tell from this message, I have no idea why none of this is
working. The mistakes (as far as I can tell) could lie in a number of places:
1) I am misunderstanding how to use relationships in CMP
2) I am misusing the xdoclet tags
3) I am misusing jboss.
I'm using postgres 7.2.1 as my backend db, running jboss-3.0.0 (I'm
downloading 3.0.1 as I type), xdoclet 1.1.2, and java 1.4 all under linux.
Any and all help would be greatly appreciated.
Nir Oren
The relations extract of my jbosscmp-jdbc.xml file:
<relationships>
<ejb-relation>
<ejb-relation-name>SourceState-Transition-Relation</ejb-relation-name>
<foreign-key-mapping/>
<ejb-relationship-role>
<ejb-relationship-role-name>state-has-many-possible-transitions</ejb-relationship-role-name>
<key-fields/>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>state-from-which-we-transition</ejb-relationship-role-name>
<key-fields/>
</ejb-relationship-role>
</ejb-relation>
<ejb-relation>
<ejb-relation-name>TargetState-Transition-Relation</ejb-relation-name>
<foreign-key-mapping/>
<ejb-relationship-role>
<ejb-relationship-role-name>target-state</ejb-relationship-role-name>
<key-fields/>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>target-for-transition-state</ejb-relationship-role-name>
<key-fields/>
</ejb-relationship-role>
</ejb-relation>
<ejb-relation>
<ejb-relation-name>CurrentState-relation</ejb-relation-name>
<foreign-key-mapping/>
<ejb-relationship-role>
<ejb-relationship-role-name>current-state</ejb-relationship-role-name>
<key-fields/>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>the-state</ejb-relationship-role-name>
<key-fields/>
</ejb-relationship-role>
</ejb-relation>
</relationships>
-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf
_______________________________________________
JBoss-user mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/jboss-user
