struts报错，请帮忙！

[tssungeng]

环境配好了：
tomcat4+struts1.2.4
-------------------------------
我的index.jsp文件：
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
-----------------------------------------
运行http://.........../index.jsp
报错：
HTTP Status 500 - Internal Server Error

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

type Exception report

message Internal Server Error

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

exception

org.apache.jasper.JasperException
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:163)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:577)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1040)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1151)
at java.lang.Thread.run(Thread.java:534)


root cause

java.lang.NullPointerException
at org.apache.struts.taglib.TagUtils.computeURLWithCharEncoding(TagUtils.java:446)
at org.apache.struts.taglib.TagUtils.computeURLWithCharEncoding(TagUtils.java:329)
at org.apache.struts.taglib.logic.RedirectTag.generateRedirectURL(RedirectTag.java:296)
at org.apache.struts.taglib.logic.RedirectTag.doEndTag(RedirectTag.java:270)
at org.apache.jsp.index_jsp._jspx_meth_logic_redirect_0(index_jsp.java:75)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:52)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:163)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:577)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1040)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1151)
at java.lang.Thread.run(Thread.java:534)



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

Apache Tomcat/4.1.30-LE-jdk14

[hxzg001]

在tomcat的work目录下有你的index.jsp所对应的index_jsp.java，你可以打开它查看52行和75行的代码。

[hxzg001]

如果你的index.jsp中使用了某个formbean的属性的话，那你直接调用jsp页面则会取不到它。

[tssungeng]

我的index.jsp：
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<logic:redirect forward="welcome"/>
-------------------
我的index_jsp.java:
package org.apache.jsp;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import org.apache.jasper.runtime.*;

public class index_jsp extends HttpJspBase {


private static java.util.Vector _jspx_includes;

private org.apache.jasper.runtime.TagHandlerPool _jspx_tagPool_logic_redirect_forward;

public index_jsp() {
_jspx_tagPool_logic_redirect_forward = new org.apache.jasper.runtime.TagHandlerPool();
}

public java.util.List getIncludes() {
return _jspx_includes;
}

public void _jspDestroy() {
_jspx_tagPool_logic_redirect_forward.release();
}

public void _jspService(HttpServletRequest request, HttpServletResponse response)
throws java.io.IOException, ServletException {

JspFactory _jspxFactory = null;
javax.servlet.jsp.PageContext pageContext = null;
HttpSession session = null;
ServletContext application = null;
ServletConfig config = null;
JspWriter out = null;
Object page = this;
JspWriter _jspx_out = null;


try {
_jspxFactory = JspFactory.getDefaultFactory();
response.setContentType("text/html;charset=ISO-8859-1");
pageContext = _jspxFactory.getPageContext(this, request, response,
null, true, 8192, true);
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;

out.write("\r\n");
if (_jspx_meth_logic_redirect_0(pageContext))
return;
out.write("\r\n");
} catch (Throwable t) {
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
out.clearBuffer();
if (pageContext != null) pageContext.handlePageException(t);
} finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
}
}

private boolean _jspx_meth_logic_redirect_0(javax.servlet.jsp.PageContext pageContext)
throws Throwable {
JspWriter out = pageContext.getOut();
/* ---- logic:redirect ---- */
org.apache.struts.taglib.logic.RedirectTag _jspx_th_logic_redirect_0 = (org.apache.struts.taglib.logic.RedirectTag) _jspx_tagPool_logic_redirect_forward.get(org.apache.struts.taglib.logic.RedirectTag.class);
_jspx_th_logic_redirect_0.setPageContext(pageContext);
_jspx_th_logic_redirect_0.setParent(null);
_jspx_th_logic_redirect_0.setForward("welcome");
int _jspx_eval_logic_redirect_0 = _jspx_th_logic_redirect_0.doStartTag();
if (_jspx_th_logic_redirect_0.doEndTag() == javax.servlet.jsp.tagext.Tag.SKIP_PAGE)
return true;
_jspx_tagPool_logic_redirect_forward.reuse(_jspx_th_logic_redirect_0);
return false;
}
}
---------------------------------------------------
报错信息中:
at org.apache.jsp.index_jsp._jspx_meth_logic_redirect_0(index_jsp.java:74)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:52)