请教crystal report 过期后不能打开是什么原因?

[AllError]

如题

[lcllcl987]

//viewer.jsp用来动态显示水晶报表.viewer.jsp的内容如下:

<%@ page language="java" contentType="text/html;charset=utf-8"%>
<%@ page import= "com.crystaldecisions.report.web.viewer.*,
com.crystaldecisions.sdk.occa.report.data.*,
com.crystaldecisions.reports.reportengineinterface.JPEReportSourceFactory,
com.crystaldecisions.sdk.occa.report.reportsource.IReportSourceFactory2,
com.crystaldecisions.sdk.occa.report.reportsource.IReportSource"%>
<%@ taglib uri="netui-tags-html.tld" prefix="netui"%>
<%
//fields rptSource
//String name = (String)request.getAttribute("nametest");
//System.out.println("name="+name);
%>
<!-- ../crystalreportviewers10/css/default.css -->
<LINK rel="stylesheet" type="text/css" href="../crystalreportviewers10/css/default.css">
<%
IReportSource rptSource = (IReportSource)session.getAttribute("rptSource");
Fields fields = (Fields) session.getAttribute("fields");
ConnectionInfos connInfos = new ConnectionInfos();
IConnectionInfo connInfo1 = new ConnectionInfo();
connInfo1.setUserName("testuser");
connInfo1.setPassword("test");
connInfos.add(connInfo1);
CrystalReportViewer viewer = new CrystalReportViewer();
viewer.setReportSource(rptSource);
viewer.setDatabaseLogonInfos(connInfos);
viewer.setParameterFields(fields);
viewer.setEnableParameterPrompt(true);
viewer.setOwnPage(true);
viewer.setOwnForm(true);
viewer.setPrintMode(CrPrintMode.ACTIVEX);
viewer.setHasExportButton(true);
viewer.setHasPrintButton(true);
viewer.setHasLogo(false);
viewer.processHttpRequest(request, response,getServletConfig().getServletContext(), out);
viewer.refresh();
//viewer.dispose();
//rptSource.dispose();
%>

把如下两句注释掉试一下如何？
//viewer.dispose();
//rptSource.dispose();