java.lang.NoClassDefFoundError

Anyone can help me solve this ?

Error 500--Internal Server Error
java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileUploadBase$SizeLimitExceededException
      at java.lang.Class.getDeclaredConstructors0(Native Method)
      at java.lang.Class.privateGetDeclaredConstructors(Class.java:2384)
      at java.lang.Class.getConstructor0(Class.java:2698)
      at java.lang.Class.newInstance0(Class.java:325)
      at java.lang.Class.newInstance(Class.java:307)
      at weblogic.servlet.internal.StubSecurityHelper$ServletInitAction.run(StubSecurityHelper.java:250)
      at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
      at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
      at weblogic.servlet.internal.StubSecurityHelper.createServlet(StubSecurityHelper.java:68)
      at weblogic.servlet.internal.StubLifecycleHelper.createOneInstance(StubLifecycleHelper.java:58)
      at weblogic.servlet.internal.StubLifecycleHelper.(StubLifecycleHelper.java:48)
      at weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.java:504)
      at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:235)
      at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)
      at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3214)
      at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
      at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
      at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:1983)
      at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1890)
      at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1344)
      at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
      at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)