i have the same error also.. this is my stack trace :
[Deployer:149033]preparing application bib3_60_0_5[paladion+MEPS_prepaid] on myserver
[Deployer:149033]prepared application bib3_60_0_5[paladion+MEPS_prepaid] on myserver
[Deployer:149033]activating application bib3_60_0_5[paladion+MEPS_prepaid] on myserver
[Deployer:149033]failed application bib3_60_0_5[paladion+MEPS_prepaid] on myserver
[Deployer:149034]An exception occurred for task [Deployer:149026]Deploy application bib3_60_0_5[paladion+MEPS_prepaid] on myserver.:
Exception:weblogic.management.ApplicationException: activate failed for ejb/accessmapper.jar
Module: ejb/accessmapper.jar Error: Exception activating module: EJBModule(ejb/accessmapper.jar,status=PREPARED)
Unable to deploy EJB: EBAccessMapper from ejb/accessmapper.jar:
[EJB:011028]The DataSource with the JNDI name: oraclePool could not be located. Please ensure that the DataSource has been deployed successfully and that the JNDI name in your EJB Deployment descriptor is correct.