Question

当我在本地机器上的servlet中检索Session属性时，它们返回正常。但是，当我在远程服务器上执行相同操作时，它们返回null并抛出空指针异常。

设置会话属性

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {      


        HttpSession sess = request.getSession();

        String categoryID = request.getParameterValues("category");
        sess.setAttribute("category",categoryID);

        RequestDispatcher rd = request.getRequestDispatcher("Questions.jsp");
        rd.forward(request, response);


}

检索会话属性

 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException, ClassNotFoundException, SQLException {


    HttpSession sess = request.getSession();
    String categories = (String) sess.getAttribute("category");

我的web.xml文件看起来像

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glassfish-web-app PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Servlet 3.0//EN" "http://glassfish.org/dtds/glassfish-web-app_3_0-1.dtd">
<glassfish-web-app error-url="">
  <context-root>/LabInspection</context-root>
  <class-loader delegate="true"/>
  <jsp-config>
    <property name="keepgenerated" value="true">
      <description>Keep a copy of the generated servlet class' java code.</description>
    </property>
  </jsp-config>
  <session-config>
   <session-timeout>600</session-timeout>
  </session-config>
</glassfish-web-app>

从远程服务器运行时，会话属性为null

0 个答案: