struts中的tiles框架怎么使用啊.

wulu627 2008-06-27 10:31:44

有人有这方面的实例不.
发个过来啊.
我的总是出错啊.
<tiles:getAsString name="title"/>这句代码.总是报以下错误.
HTTP Status 500 -

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type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Error - tag.getAsString : component context is not defined. Check tag syntax
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

javax.servlet.ServletException: Error - tag.getAsString : component context is not defined. Check tag syntax
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:858)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
org.apache.jsp.Background.backLayout_jsp._jspService(org.apache.jsp.Background.backLayout_jsp:82)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

javax.servlet.jsp.JspException: Error - tag.getAsString : component context is not defined. Check tag syntax
org.apache.struts.taglib.tiles.GetAttributeTag.doEndTag(GetAttributeTag.java:155)
org.apache.jsp.Background.backLayout_jsp._jspx_meth_tiles_getAsString_0(org.apache.jsp.Background.backLayout_jsp:181)
org.apache.jsp.Background.backLayout_jsp._jspx_meth_html_html_0(org.apache.jsp.Background.backLayout_jsp:109)
org.apache.jsp.Background.backLayout_jsp._jspService(org.apache.jsp.Background.backLayout_jsp:73)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.15 logs.

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Apache Tomcat/5.5.15

<tiles:insert attribute="header"/>这句代码报以下错误.
HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Exception in JSP: /Background/backLayout.jsp:18

15: <body>
16: <table width="770" border="0" align="center" cellpadding="0" cellspacing="0">
17: <tr>
18: <td colspan="2" align="center"><tiles:insert attribute="header"/></td>
19: </tr>
20: <tr>
21: <td width="125" align="right"><tiles:insert attribute="menu"/></td>

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

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.Background.backLayout_jsp._jspx_meth_tiles_insert_0(org.apache.jsp.Background.backLayout_jsp:174)
org.apache.jsp.Background.backLayout_jsp._jspx_meth_html_html_0(org.apache.jsp.Background.backLayout_jsp:112)
org.apache.jsp.Background.backLayout_jsp._jspService(org.apache.jsp.Background.backLayout_jsp:70)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.15 logs.

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Apache Tomcat/5.5.15

这是怎么回事啊.是不是需要导入什么包啊..

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