Question

这是我的ServletUnit代码：

File webXml = new File(path/to/web.xml);
ServletRunner sr = new ServletRunner(webXml);
ServletUnitClient sc = sr.newClient();
PostMethodWebRequest request = new PostMethodWebRequest("http://localhost/responseHtmlView.jsp");
sc.getResponse(request);

的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
  xmlns="http://java.sun.com/xml/ns/j2ee" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <servlet>
    <servlet-name>org.apache.jsp.responseHtmlView_jsp</servlet-name>
    <servlet-class>org.apache.jsp.responseHtmlView_jsp</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>org.apache.jsp.responseHtmlView_jsp</servlet-name>
    <url-pattern>/responseHtmlView.jsp</url-pattern>
  </servlet-mapping>
</web-app>

responseHtmlView.jsp

<html>
  <head><title>First JSP</title></head>
  <body>
    <p>Test text</p>
  </body>
</html>

我使用Tomcat 7和Ant（jasper2任务）预编译jsp，在代码执行期间我得到异常：

java.lang.NullPointerException 
  at org.apache.jsp.responseHtmlView_jsp._jspInit(responseHtmlView_jsp.java:32) 
  at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49) at com.meterware.servletunit.WebApplication$ServletConfiguration.getServlet(WebApplication.java:587) 
  at com.meterware.servletunit.WebApplication$ServletRequestImpl.getServlet(WebApplication.java:775) 
  at com.meterware.servletunit.InvocationContextImpl$ExecutionContext.getServlet(InvocationContextImpl.java:248) 
  at com.meterware.servletunit.InvocationContextImpl.getServlet(InvocationContextImpl.java:86) 
  at com.meterware.servletunit.InvocationContextImpl.service(InvocationContextImpl.java:76) 
  at com.meterware.servletunit.ServletUnitClient.newResponse(ServletUnitClient.java:126) 
  at com.meterware.httpunit.WebClient.createResponse(WebClient.java:647) at com.meterware.httpunit.WebWindow.getResource(WebWindow.java:220) 
  at com.meterware.httpunit.WebWindow.getSubframeResponse(WebWindow.java:181) 
  at com.meterware.httpunit.WebWindow.getResponse(WebWindow.java:158) 
  at com.meterware.httpunit.WebClient.getResponse(WebClient.java:122) 
  ...

这一行：

_el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();

将_jspxFactory初始化为：

   private static final javax.servlet.jsp.JspFactory _jspxFactory =
      javax.servlet.jsp.JspFactory.getDefaultFactory(); // == null

这是一个错误，如下所示： https://bz.apache.org/bugzilla/show_bug.cgi?id=40820

但我无法找到解决方法，因为关于我正在尝试做什么的信息不多。我正在尝试获取jsp servlet响应，从中获取HTML正文，然后能够将其与另一个进行比较以进行差异检查。这个动作是一个功能测试，所以我不想运行一个完整的服务器，我不想搞任何像Selenium那样重的东西。

为什么在尝试在ServletUnit中获得响应时会获得NPE？

0 个答案: