Hello,
I am having difficulty creating a container managed relationship. I am using jboss
3.2 on a windows machine.
My ejb-jar.xml file relationship content is:
<!-- Relationships -->
<ejb-relation >
<ejb-relation-name>split-machines</ejb-relation-name>
<ejb-relationship-role >
<ejb-relationship-role-name>machine-belongs_to-split</ejb-relationship-role-name>
< multiplicity >Many</ multiplicity >
<cascade-delete/>
<relationship-role-source >
<ejb-name>Machine</ejb-name>
</relationship-role-source>
<cmr-field >
<cmr-field-name>splitLocal</cmr-field-name>
</cmr-field>
</ejb-relationship-role>
<ejb-relationship-role >
<ejb-relationship-role-name>splits-has-machines</ejb-relationship-role-name>
< multiplicity >One</ multiplicity >
<relationship-role-source >
<ejb-name>Split</ejb-name>
</relationship-role-source>
<cmr-field >
<cmr-field-name>machines</cmr-field-name>
<cmr-field-type>java.util.Collection</cmr-field-type>
</cmr-field>
</ejb-relationship-role>
</ejb-relation>
So what I'm trying to create is a bidirectional 1:N relationship b/w splits and
machines.
In my SplitEJB file I have the following methods related to Machines:
//Split class
|
| /**
| *
| * -generated May 26, 2004 11:26:34 AM
| * @param machineId
| * @param machineName
| * @ejb.interface-method
| */
| public void addMachine(int machineId, String machineName)
| throws FinderException, CreateException {
| try{
| MachineLocal machine =
| MachineUtil.getLocalHome().create(machineId, machineName);
| getMachines().add(machine);
| } catch(NamingException e) {
| CreateException ce = new CreateException(e.getMessage());
| ce.initCause(e);
| throw ce;
| }
| }
|
| /**
| *
| * -generated May 26, 2004 11:31:45 AM
| * @return
| * @ejb.interface-method
| */
| public Collection getAllMachineValues(){
| List machineValues = new ArrayList();
| for(Iterator iterator = getMachines().iterator(); iterator.hasNext(); ) {
| MachineLocal machine = (MachineLocal)iterator.next();
| machineValues.add(machine.getMachineValue());
| }
|
| return (Collection)machineValues;
| }
|
| /**
| *
| * -generated May 26, 2004 1:21:46 PM
| * @return
| * @ejb.interface-method
| */
| public int getNumberOfMachines() {
| return getMachines().size();
| }
|
| /**
| *
| * -generated May 26, 2004 1:22:54 PM
| * @return
| * @ejb.interface-method
| * view-type = "local"
| * @ejb.relation
| * name = "split-machines"
| * role-name = "splits-has-machines"
| *
| */
| public abstract Collection getMachines();
| public abstract void setMachines(Collection machines);
|
| // End Split class
|
| The pertanent methods in the machine class are:
| //Machine class
| /**
| *
| * -generated May 26, 2004 3:02:26 PM
| * @return
| * @ejb.persistence
| * column-name = "SPLIT_ID"
| *
| */
| public abstract Integer getSplitId();
| public abstract void setSplitId(int splitId);
|
| // -------------------------------------------
| // CMR (Container Managed Relationship) fields
| // -------------------------------------------
|
| /**
| *
| * -generated May 26, 2004 11:14:35 AM
| * @return
| * @ejb.interface-method
| * view-type = "local"
| * @ejb.relation
| * name = "split-machines"
| * role-name = "machine-belongs_to-split"
| * cascade-delete = "yes"
| *
| * @jboss.relation
| * related-pk-field = "id"
| * fk-column = "SPLIT_ID"
| * fk-constraint = "true"
| */
| public abstract SplitLocal getSplitLocal();
| public abstract void setSplitLocal(Split split);
|
| /**
| *
| * -generated May 18, 2004 3:04:10 PM
| * @param id
| * @param name
| * @return
| * @throws CreateException
| * @ejb.create-method
| */
| public Integer ejbCreate(int id, String name) throws CreateException {
| System.out.println("Creating Machine - id: " + id + " name: " + name);
| setId(new Integer(id));
| setName(name);
| return null;
| }
| [/c[de]
| //End Machine class
|
| When I attempt to add machines to a split I get a Create exception saying that
null cannot be passed into the foreign key (see machine create method), I was under
the impression that the this would be taken care of by the Container managed
persistence.
|
| Any light on how to assign a primary key to an entity bean would be very helpful.
|
| Thanks
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