奇怪的java.lang.NullPointerException
就剩18分了   哎~~~~

是这样的

我之前使用的是：
jdk-1_5_0_05-windows-i586-p.exe
jakarta-tomcat-5.5.9.exe

eclipse-SDK-3.2-win32.zip
MyEclipseEnterpriseWorkbenchInstaller_5.0.1GA_E3.2.exe
Access

小项目做完发到tomcat里运行正常
后来因为需要我换了

j2sdk-1_4_2_06-windows-i586-p
jakarta-tomcat-5.0.28.exe

之后   刚到index.jsp时就出现错误


错误提示如下：


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
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root   cause  

java.lang.NullPointerException
org.apache.struts.util.RequestUtils.pageURL(RequestUtils.java:1596)
org.apache.struts.util.RequestUtils.computeURL(RequestUtils.java:541)
org.apache.struts.util.RequestUtils.computeURL(RequestUtils.java:436)
org.apache.struts.util.RequestUtils.computeURL(RequestUtils.java:396)
org.apache.struts.taglib.logic.RedirectTag.doEndTag(RedirectTag.java:294)
org.apache.jsp.index_jsp._jspx_meth_logic_redirect_0(index_jsp.java:157)
org.apache.jsp.index_jsp._jspx_meth_html_html_0(index_jsp.java:117)
org.apache.jsp.index_jsp._jspService(index_jsp.java:68)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note   The   full   stack   trace   of   the   root   cause   is   available   in   the   Apache   Tomcat/5.0.28   logs.


大侠们帮看看，谢谢了啊
是jdk   1.5   和   1.4的区别使然吗？
还是tomcat版本还是什么问题？谢谢大家了

------解决方案--------------------
第一页的代码有问题index.jsp?
------解决方案--------------------
感觉是lz的jsp页面头部声明taglib时候出错了 看下路径对不对
------解决方案--------------------
<logic:redirect page= "/list.do "> </logic:redirect>

路劲问题？
------解决方案--------------------
有可能是JDK版本问题
我的异常网推荐解决方案：The server encountered an internal error () that prevented it from fulfilling this request.,http://www.aiyiweb.com/java-web/317.html