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

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java.lang.NoClassDefFoundError: org/apache/log4j/Logger	at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:701)	at weblogic.servlet.internal.ServletStubImpl.getServlet(ServletStubImpl.java:447)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:287)	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:242)	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:5360)	at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:721)	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3043)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2468)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)