exception during deployment

I am new user and not sure this is the right forum, if not please refer
me to the correct location.

 

I am deploying an EE project using EJB 3. I created some entity beans
and then deployed the web application. As the application was deploying
I received the following exception

 

 

Total Deployment Time: 6462 msec, Total EJB Compiler Module Time: 46
msec, Portion spent EJB Compiling: 0%

Breakdown of EJBC Module Time: Total Time for EJBC: 46 msec, CMP
Generation: 0 msec (0%), Java Compilation: 0 msec (0%), RMI Compilation:
0 msec (0%), JAX-RPC Generation: 31 msec (67%), 

|#]

Exception occured in J2EEC Phase

com.sun.enterprise.deployment.backend.IASDeploymentException:
java.lang.NullPointerException

        at
com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.loadPe
rsistenceUnitBundle(PersistenceProcessor.java:458)

        at
com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.genera
teDDLFiles(PersistenceProcessor.java:282)

        at
com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.proces
sAppBundle(PersistenceProcessor.java:170)

        at
com.sun.jdo.spi.persistence.support.ejb.ejbc.PersistenceProcessor.proces
sApplication(PersistenceProcessor.java:112)

        at
com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl
.processApplication(DeploymentEventListenerImpl.java:193)

        at
com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl
.processEvent(DeploymentEventListenerImpl.java:152)

        at
com.sun.jdo.spi.persistence.support.ejb.ejbc.DeploymentEventListenerImpl
.notifyDeploymentEvent(DeploymentEventListenerImpl.java:109)

        at
com.sun.enterprise.deployment.backend.DeploymentEventManager.notifyDeplo
ymentEvent(DeploymentEventManager.java:66)

        at
com.sun.enterprise.deployment.backend.AppDeployer.postDeploy(AppDeployer
.java:418)

        at
com.sun.enterprise.deployment.backend.AppDeployer.deploy(AppDeployer.jav
a:220)

        at
com.sun.enterprise.deployment.backend.AppDeployer.doRequestFinish(AppDep
loyer.java:125)

        at
com.sun.enterprise.deployment.phasing.J2EECPhase.runPhase(J2EECPhase.jav
a:169)

        at
com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(Deplo
ymentPhase.java:95)

        at
com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(
PEDeploymentService.java:842)

        at
com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeplo
ymentService.java:260)

        at
com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeplo
ymentService.java:716)

        at
com.sun.enterprise.management.deploy.DeployThread.deploy(DeployThread.ja
va:165)

        at
com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:
194)

|#]

It seems there is something wrong with the persistent configuration, but
at this I do not know enough to make and educated guess. Any suggestions
are appreciated.