Error description: nullpointer exception databasepersistence policy in jboss
Solution: edit the file server/default/deploy/ejb-deployer.xml and remove all the block J2EE timer service
//--need to erase all this!
name="jboss.ejb:service=EJBTimerService">
jboss.ejb:service=EJBTimerService,retryPolicy=fixedDelay
jboss.ejb:service=EJBTimerService,persistencePolicy=database
org.jboss.ejb.txtimer.BigIntegerTimerIdGenerator
org.jboss.ejb.txtimer.TimedObjectInvokerImpl
jboss:service=TransactionManager
100
jboss.jca:service=DataSourceBinding,name=DefaultDS
org.jboss.ejb.txtimer.GeneralPurposeDatabasePersistencePlugin
TIMERS