struts的tiles问题

Question

无法显示tiles页面，tomcat老报错，郁闷了，下面是错误信息：
exception org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
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:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause java.lang.NullPointerException
org.apache.struts.taglib.tiles.InsertTag.processAttribute(InsertTag.java:687)
org.apache.struts.taglib.tiles.InsertTag.createTagHandler(InsertTag.java:478)
org.apache.struts.taglib.tiles.InsertTag.doStartTag(InsertTag.java:438)
org.apache.jsp.layout_jsp._jspx_meth_tiles_005finsert_005f0(layout_jsp.java:126)
org.apache.jsp.layout_jsp._jspService(layout_jsp.java:68)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
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:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
好像无法识别tiles标签，该如何解决这个问题啊？？

Answer 1

org.apache.jsp.layout_jsp._jspx_meth_tiles_005finsert_005f0(layout_jsp.java:126) 你到临时文件 layout_jsp.java 中看下 126行的内容是什么

Answer 2

问题解决了，是struts-config.xml配置没写好，原先是这样写的：
<action
      parameter="index-definition"
      path="/index"
      type="com.yourcompany.struts.action.IndexAction">
      <forward name="success" path="/layout.jsp" />
</action>
修改了，path="index-definition"后就正常显示了。还是没仔细看书，没完全理解就敲例子代码，心急吃不了热豆腐啊，╮(╯▽╰)╭