java.lang.NoClassDefFoundError: org/apache/log4j/Priority

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java.lang.NoClassDefFoundError: org/apache/log4j/Priority
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:1494)
at weblogic.ejb20.deployer.EJBModule.disableImplClassLoader(EJBModule.java:1082)
at weblogic.ejb20.deployer.EJBModule.setupEJBToImplClassDependencies(EJBModule.java:982)
at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:419)
at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:2792)
at weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.java:1478)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1136)
at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:975)
at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareContainer(SlaveDeployer.java:2571)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer(SlaveDeployer.java:2523)
at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.java:2453)
at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:820)
at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:536)

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