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java.lang.NullPointerException at weblogic.servlet.internal.session.SessionData.removeAttribute(SessionData.java:627) at weblogic.servlet.internal.session.SessionData.removeAttribute(SessionData.java:586) at weblogic.servlet.internal.session.ReplicatedSessionData.removeAttribute(ReplicatedSessionData.java:523) at com.mypackage.SomeSessionContext.clear(SomeSessionContext.java:893)