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HttpSession is invalid
java.lang.IllegalStateException: HttpSession is invalid at weblogic.servlet.internal.session.ReplicatedSessionData.removeAttribute(ReplicatedSessionData.java:351) at prov.cont.web.WebCtrl.procCheckEvent(WebCtrl.java:484) at prov.cont.web.WebCtrl.procReq(WebCtrl.java:285) at prov.cont.web.WebCtrl.perfTsk(WebCtrl.java:328) at prov.cont.web.Base.doPost(Base.java:88) at prov.cont.web.Base.doGet(Base.java:72) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:213) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:157) at prov.cont.web.Base.dispServlet(Base.java:136) at prov.cont.web.MainS.perfTsk(MainS.java:16) at prov.cont.web.Base.doPost(Base.java:88) at prov.cont.web.Base.doGet(Base.java:72) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:213) at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:1265) at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:1631) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137) at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)