Java Struts 1 HTTP 状态 500

Question

我正在 java web JSP Struts 中编写我的第一个 helloworld web 项目 1. 我已努力修复此 HTTP Status 500 错误。任何帮助将不胜感激。这是我的 githud 代码源：https://github.com/paeltc/Struts1Demo1.

这是我得到的回复：

HTTP Status 500 – Internal Server Error
Type Exception Report

Message java.lang.NullPointerException

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: java.lang.NullPointerException
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
    org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Root Cause

java.lang.NullPointerException
    org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:289)
    org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:357)
    org.apache.struts.chain.commands.CreateActionForm.execute(CreateActionForm.java:92)
    org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
    org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
    org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
Note The full stack trace of the root cause is available in the server logs.

我正在使用 Apache Tomcat/9.0.27

Answer 1

你笨拙的包名给你带来了麻烦。

查看您的 struts-config.xml 文件（应该张贴在您的问题中；问题必须尽可能独立）：

<form-bean name="helloStruts1Form" type="com.tpe.dev.form.HelloStruts1Form" />

现在查看代码中唯一名为 HelloStruts1Form:

的东西

package com.dev.tpe.form;

看到问题了吗？

请参阅 How to Ask 页面。

Java Struts 1 HTTP 状态 500

Java Struts 1 HTTP Status 500

jsp

http-status-code-500

struts-config