when ejb.jar file is deployed on weblogic it shows following error


Exception:weblogic.management.ApplicationException: prepare failed for ejb1 Module: ejb1 Error: Exception preparing module: EJBModule(ejb1,status=NEW) Unable to deploy EJB: C: eaweblogic81common emplatesdomainsmyserverejb1.jar from ejb1.jar: weblogic.ejb20.deployer.DeploymentDescriptorException: Unable to load a class specified in your ejb-jar.xml: Class bytes found but defineClass()failed for: 'ejb20.HelloBean' at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(MBeanDeploymentInfoImpl.java:548) at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl. (MBeanDeploymentInfoImpl.java:232) at weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1262) at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:477) at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:2847) at weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.java:1534) at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1188) at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1031) at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareContainer(SlaveDeployer.java:2634) at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer(SlaveDeployer.java:2584) at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.java:2506) at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:833) at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:542) at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:500) 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)

[Deployer]preparing application ejb1 on myserver
[Deployer]failed application ejb1 on myserver
[Deployer]An exception occurred for task [Deployer]Deploy application ejb1 on myserver.: Exception:weblogic.management.ApplicationException: prepare failed for ejb1 Module: ejb1 Error: Exception preparing module: EJBModule(ejb1,status=NEW) Unable to deploy EJB: C: eaweblogic81common emplatesdomainsmyserverejb1.jar from ejb1.jar: weblogic.ejb20.deployer.DeploymentDescriptorException: Unable to load a class specified in your ejb-jar.xml: Class bytes found but defineClass()failed for: 'ejb20.HelloBean' at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(MBeanDeploymentInfoImpl.java:548) at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl. (MBeanDeploymentInfoImpl.java:232) at weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1262) at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:477) at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:2847) at weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.java:1534) at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1188) at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1031) at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareContainer(SlaveDeployer.java:2634) at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer(SlaveDeployer.java:2584) at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.java:2506) at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:833) at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:542) at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:500) 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) .

thanks in advance