The operation could not be completed. One probable cause could be that your session has expired.
Status Code : 500
Message : null
Exception : null
   gr.uoa.di.katoptro.web.user.LoadDocumentListAction.getDocumentSearchResults(LoadDocumentListAction.java:109)
   gr.uoa.di.katoptro.web.user.LoadDocumentListAction.execute(LoadDocumentListAction.java:29)
   org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
   org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
   gr.uoa.di.katoptro.web.KatoptroRequestProcessor.process(KatoptroRequestProcessor.java:33)
   org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
   org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
   org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
   org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
   org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
   org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
   org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
   org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
   org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
   org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
   org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
   org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
   org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
   org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
   org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
   java.lang.Thread.run(Thread.java:701)