Google App Engine开发服务器给出错误500（IntelliJ IDEA）
[英]Google App Engine Dev Server Gives Error 500 (IntelliJ IDEA)
问题描述
I've just done a clean install of: 
我刚刚完成了以下内容的全新安装：
- IntelliJ IDEA 2016.2.4 IntelliJ IDEA 2016.2.4
- Google App Engine Java SDK 1.9.42 Google App Engine Java SDK 1.9.42
- Java JDK 1.8.0_102 Java JDK 1.8.0_102
I have just created a new Java Web Application in IntelliJ That I will be running on my localhost (using the AppEngine Dev Server 1.9.42, this server is included in the App Engine SDK). 我刚刚在IntelliJ中创建了一个新的Java Web应用程序，它将在我的本地主机上运行（使用AppEngine Dev Server 1.9.42，该服务器包含在App Engine SDK中）。
My project is brand new. 我的项目是全新的。
It auto-generated an index.jsp for me: 它为我自动生成了一个index.jsp：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
$END$
</body>
</html>
A default web.xml: 默认的web.xml：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
</web-app>
And a standard appengine-web.xml: 还有一个标准的appengine-web.xml：
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application></application>
<version>1</version>
<threadsafe>true</threadsafe>
</appengine-web-app>
I think that's all OK, but when I try to run this example. 我认为一切都很好，但是当我尝试运行此示例时。 I get an ERROR 500... (This looks like crap...I know) 我收到错误500 ...（看起来像废话...我知道）
HTTP ERROR 500
Problem accessing /.
Unable to load class for JSP Caused by:org.apache.jasper.JasperException: Unable to load class for JSP at org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:630) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:144) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at com.google.appengine.tools.development.PrivilegedJspServlet.access$101(PrivilegedJspServlet.java:23) at com.google.appengine.tools.development.PrivilegedJspServlet$2.run(PrivilegedJspServlet.java:61) at java.security.AccessController.doPrivileged(Native Method) at com.google.appengine.tools.development.PrivilegedJspServlet.service(PrivilegedJspServlet.java:58) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHa
java.lang.ClassNotFoundException: org.apache.jsp.index_jsp at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134) at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66) at org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:628) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:144) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) at com.google.appengine.tools.development.PrivilegedJspServlet.access$101(PrivilegedJspServlet.java:23) at com.google.appengine.tools.development.PrivilegedJspServlet$2.run(PrivilegedJspServlet.java:61) at java.security.AccessController.doPrivileged(Native Method) at com.google.appengine.tools.development.PrivilegedJspServlet.service(
This is my project structure/layout: 这是我的项目结构/布局：
Does anybody with some more experience know what I could've done wrong? 有更多经验的人知道我做错了什么吗？ If you need any further info, I'll happy to give it. 如果您需要任何其他信息，我们将很乐意提供。
Thanks in Advance. 提前致谢。
Tristan 特里斯坦
1 个解决方案
解决方案1
1 已采纳 2016-09-28 09:52:56
App engine standard environment runs servlet spec 2.5 under Java 1.7 App Engine标准环境在Java 1.7下运行servlet spec 2.5
You'll need to change: 您需要更改：
- web.xml to use the correct syntax for 2.5 web.xml使用2.5的正确语法
- your jsp to use the correct syntax for jstl under 2.5 and 您的jsp对2.5以下的jstl使用正确的语法，并且
- make sure it runs under 1.7 确保它在1.7以下运行
I'd start with installing the 1.7 sdk then if everything is ok try putting it back to 1.8 sdk running for compatibility for 1.7 There are some versions of 1.8 that break jsp compilation when running under 1.7 我将从安装1.7 sdk开始，然后，如果一切正常，请尝试将其恢复回1.8 sdk，以实现1.7的兼容性。在1.7之下运行时，某些1.8版本会破坏jsp编译
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