Java Struts 1 HTTP 狀態 500

Question

我正在用 java web JSP Struts 1 編寫我的第一個 helloworld web projet。我已經努力修復這個 HTTP 狀態 500 錯誤。 任何幫助將不勝感激。 這是我的 githud 代碼源： https : //github.com/paeltc/Struts1Demo1 。

這是我得到的回應：

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

你笨拙地轉換的包名給你帶來了問題。

查看您的struts-config.xml文件（應該在您的問題中發布；問題必須盡可能獨立）：

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

現在查看代碼中唯一名為HelloStruts1Form ：

package com.dev.tpe.form;

看到問題了嗎？

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請參閱如何提問頁面。