How to clear the report from Cache.

Question

Hello all,,,
In my project iam using crystsal report for eclipse to generate reports.
Iam using a .jsp page to call my report.(which i got it from the examples of CRE).
The name of my jsp page is poi.jsp
The name of my Crystal report is Department.rpt
My problem is this....
when i run the report first time i can see my poi.jsp page and user can submit
the parameter and based on the users parameter the report is generated..(ITs working absoultely fine)
but when the user runs the report again, its not showing the parameter page (i.e user cannot see poi.jsp)
rather its showing the old generated report.
When i tried using session.invalidate and session.removeAttribute it was showing me the poi.jsp page
but the problem is when the user clicks on the print icon or any icon on the report its just
showing the poi.jsp page...
When the user closes the report or when the clicks on the button to generate the report it should
show the parameter page (poi.jsp).how can i solve this problem???
the code what i am using is as follows
try {
          String reportName = "C:/workspace/Reports/WebContent/Department.rpt";
          ReportClientDocument clientDoc = (ReportClientDocument) session.getAttribute(reportName);
          if (clientDoc == null) {
               // Report can be opened from the relative location specified in the CRConfig.xml, or the report location
               // tag can be removed to open the reports as Java resources or using an absolute path
               // (absolute path not recommended for Web applications).
               clientDoc = new ReportClientDocument();
               clientDoc.setReportAppServer(ReportClientDocument.inprocConnectionString);
               // Open report
               clientDoc.open(reportName, OpenReportOptions._openAsReadOnly);
               // ****** BEGIN SET RUNTIME DATABASE CREDENTIALS **************** 
                    String connectString = "jdbc:oracle:thin:@192.168.1.4:1521:orcl";
                    String driverName = "oracle.jdbc.driver.OracleDriver";
                    String JNDIName = "orcl";
                    String userName = "act_db";               // TODO: Fill in database user
                    String password = "act_db";          // TODO: Fill in password
                    // Switch all tables on the main report and sub reports
                    CRJavaHelper.changeDataSource(clientDoc, userName, password, connectString, driverName, JNDIName);
                    // logon to database
                    CRJavaHelper.logonDataSource(clientDoc, userName, password);
               // ****** END SET RUNTIME DATABASE CREDENTIALS ****************           
               // ****** BEGIN CONNECT PARAMETERS SNIPPET ****************          
                    // STRING VALUE PARAMETER. 
                    String stringValue = request.getParameter("DeptId");;     // TODO: Fill in value
                    CRJavaHelper.addDiscreteParameterValue(clientDoc, "", "DeptId", stringValue);
               // ****** END CONNECT PARAMETERS SNIPPET ****************     
               // Store the report document in session
               session.setAttribute(reportName, clientDoc);
          // ****** BEGIN CONNECT CRYSTALREPORTPAGEVIEWER SNIPPET **************** 
               // Create the CrystalReportViewer object
               CrystalReportViewer crystalReportPageViewer = new CrystalReportViewer();
               String reportSourceSessionKey = reportName+"ReportSource";
               session.removeAttribute("reportSource");
               Object reportSource = session.getAttribute(reportSourceSessionKey);
               if (reportSource == null)
                    reportSource = clientDoc.getReportSource();
                    session.setAttribute(reportSourceSessionKey, reportSource);
               //     set the reportsource property of the viewer
               crystalReportPageViewer.setReportSource(reportSource);
               crystalReportPageViewer.setDisplayGroupTree(false);
             session.removeValue("reportSource");
               crystalReportPageViewer.setHasRefreshButton(true);
               // Apply the viewer preference attributes
               // Process the report
               crystalReportPageViewer.processHttpRequest(request, response, application, null);
          // ****** END CONNECT CRYSTALREPORTPAGEVIEWER SNIPPET ****************          
     } catch (ReportSDKExceptionBase e) {
         out.println(e);
Thanks In advance
Regards,
Amol Patil

Answer 1

CrystalReportViewer viewer = new CrystalReportViewer();
viewer.setReportSource(reportSource);
     viewer.setReportSource(reportSource);
     viewer.setHasRefreshButton(true);
     viewer.setOwnPage(true);
     viewer.setOwnForm(true);
     viewer.setHasExportButton(true);
     viewer.setZoomFactor(100);
     viewer.setPrintMode(CrPrintMode.ACTIVEX);
    viewer.setParameterFields(fields);
viewer.setEnableParameterPrompt(true); --this line will prompt