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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)