java.lang.IllegalArgumentException: Null keys not supported

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java.lang.IllegalArgumentException: Null keys not supported
at weblogic.utils.collections.WeakConcurrentHashMap.get(WeakConcurrentHashMap.java:189)
at weblogic.utils.wrapper.WrapperFactory.getCachedWrapperClass(WrapperFactory.java:51)
at weblogic.utils.wrapper.WrapperFactory.getWrapperClass(WrapperFactory.java:183)
at weblogic.utils.wrapper.WrapperFactory.getWrapperClass(WrapperFactory.java:171)
at weblogic.jdbc.wrapper.JDBCWrapperFactory.getWrapper(JDBCWrapperFactory.java:146)
at weblogic.jdbc.jts.Driver.newConnection(Driver.java:674)
at weblogic.jdbc.jts.Driver.createLocalConnection(Driver.java:196)
at weblogic.jdbc.jts.Driver.connect(Driver.java:154)
at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:305)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.getConnection(RDBMSPersistenceManager.java:2247)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.verifyDatabaseType(RDBMSPersistenceManager.java:2459)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.setup(RDBMSPersistenceManager.java:198)
at weblogic.ejb20.manager.BaseEntityManager.setupPM(BaseEntityManager.java:253)
at weblogic.ejb20.manager.BaseEntityManager.setup(BaseEntityManager.java:210)
at weblogic.ejb20.manager.DBManager.setup(DBManager.java:154)
at weblogic.ejb20.deployer.ClientDrivenBeanInfoImpl.activate(ClientDrivenBeanInfoImpl.java:1057)
at weblogic.ejb20.deployer.EJBDeployer.activate(EJBDeployer.java:1322)
at weblogic.ejb20.deployer.EJBModule.activate(EJBModule.java:610)
at weblogic.j2ee.J2EEApplicationContainer.activateModule(J2EEApplicationContainer.java:3127)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2081)
at weblogic.j2ee.J2EEApplicationContainer.activate(J2EEApplicationContainer.java:2062)
at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.activateContainer(SlaveDeployer.java:2592)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.doCommit(SlaveDeployer.java:2515)
at weblogic.management.deploy.slave.SlaveDeployer$Task.commit(SlaveDeployer.java:2317)
at weblogic.management.deploy.slave.SlaveDeployer$Task.checkAutoCommit(SlaveDeployer.java:2399)
at weblogic.management.deploy.slave.SlaveDeployer$Task.prepare(SlaveDeployer.java:2311)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.java:2479)
at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:798)
at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:507)
at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:465)
at weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:25)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.doCommit(SlaveDeployer.java:2517)
at weblogic.management.deploy.slave.SlaveDeployer$Task.commit(SlaveDeployer.java:2317)
at weblogic.management.deploy.slave.SlaveDeployer$Task.checkAutoCommit(SlaveDeployer.java:2399)
at weblogic.management.deploy.slave.SlaveDeployer$Task.prepare(SlaveDeployer.java:2311)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.java:2479)
at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:798)
at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:507)
at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:465)
at weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:25)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)

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