JDO - getObjectId, how to retrieve the id of identity obj after insert

[Philippe Guillard]

Hi,

I wanna create a new data object in datastore without precising the 
primary id, while letting database naming the id autoincremently. But in
the same time, i need to know the id attributed to this object, so that 
i can reuse it later. 
I wrote the code in an xsp like following, but i 
got an error saying :
  "org.apache.cocoon.ProcessingException: Exception in 
ServerPagesGenerator.generate(): javax.jdo.JDOUserException: No 
transaction in progress."
(If i only execute the lines before  Object oid = pm.getObjectId(bean); 
the object is created successfully in the DB with an id incrementally. )

Any idee? Another solution? 

thanks,

Phil

*******
<?xml version="1.0"?>
<xsp:page language="java" xmlns:xsp="http://apache.org/xsp";>

  <xsp:structure>                // import class
      <xsp:include>javax.jdo.PersistenceManager</xsp:include>
      <xsp:include>javax.jdo.Transaction</xsp:include>
      
<xsp:include>org.apache.cocoon.ojb.jdo.components.JdoPMF</xsp:include>
      <xsp:include>javax.jdo.Transaction</xsp:include>
      
<xsp:include>org.apache.cocoon.ojb.samples.bean.Department</xsp:include>
  </xsp:structure>

  <xsp:init-page>                // declare
      JdoPMF pmf = null;
      PersistenceManager pm = null;
      PersistenceManager pm2 = null;
      int id;
  </xsp:init-page>

  <page>
      <content>
          <xsp:logic>
          try {
              /* Get the PersistenceManager */
              try {
                  pmf = (JdoPMF) manager.lookup(JdoPMF.ROLE);
                  pm = pmf.getPersistenceManager();
              } catch (ComponentException cme) {
                  getLogger().error("Could not look up the 
PersistenceManager", cme);
              }              
              pm.currentTransaction().begin();              
              Department bean = new Department();
              bean.setName("JDO Development");              
              pm.makePersistent(bean);                      // add obj 
in datastore
              pm.currentTransaction().commit();

              Object oid = pm.getObjectId(bean);            // 
getObjectId of the identity object
              pm.close();
              pm2 = pmf.getPersistenceManager();
              pm2.currentTransaction().begin();
              Department bean2 = (Department) pm.getObjectById(oid,
true);
              id = bean2.getId();

          </xsp:logic>
          <p> Inserted data:  <xsp:expr>id</xsp:expr></p>
          <xsp:logic>
          }
          finally {
              manager.release((Component)pmf);
          }
      </xsp:logic>
      </content>
  </page>
</xsp:page>


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