HTTP状态500-无法为JSP Java8，Tomcat8.5编译类
[英]HTTP Status 500 - Unable to compile class for JSP Java8, Tomcat8.5
问题描述
I have a main jsp file which makes use of java class in the boxers package. 
我有一个主要的jsp文件，该文件在boxers软件包中使用了java类。 But when I try to run jsp , the following error occures: HTTP Status 500 - Unable to compile class for JSP:in the jsp file: /web/date_info.jsp boxers.B cannot be resolved to a type . 但是，当我尝试运行jsp ，会发生以下错误： HTTP Status 500 - Unable to compile class for JSP:in the jsp file: /web/date_info.jsp boxers.B cannot be resolved to a type 。
date_info.jsp date_info.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<p><%= boxers.B.voice()%></p>
</body>
</html>
B class: B班：
package boxers;
public class B {
public static String voice()
{
return "HELLO";
}
}
I've read the conflict between versions can cause this; 我读过版本之间的冲突会导致这种情况； my Java version is 8, Tomcat 8.5.. 我的Java版本是8，Tomcat 8.5。
I've looked into webapps/my_app/build/web/WEB-INF/classes/boxers folder and there is a B.class file... 我查看了webapps/my_app/build/web/WEB-INF/classes/boxers B.class文件夹，这里有一个B.class文件...
EDIT: I wonder if those who downvote at least know the answer to the question. 编辑：我想知道那些投票不足的人是否至少知道问题的答案。
1 个解决方案
解决方案1
1 已采纳 2016-09-10 12:24:26
Figured it out. 弄清楚了。 The application wasn't deployed correctly. 该应用程序未正确部署。 The deployment process, described here helped me out. 此处描述的部署过程对我有所帮助。 In particular - copying web application archive file (.war) and copying unpacked web application directory . 特别是- copying web application archive file (.war)和copying unpacked web application directory 。 My main mistake was that initially I applied the second method in the wrong way - copied all the folders in the app directory, created by Netbeans (build, src, web etc), while only NetbeansProjects/app_name/build/web 's content should have been copied into tomcat/app_name/ . 我的主要错误是，最初我以错误的方式应用了第二种方法-复制了由Netbeans创建的app目录中的所有文件夹（build，src，web等），而只有NetbeansProjects/app_name/build/web的内容应该已复制到tomcat/app_name/ 。 Or just copy the war-file of NebeansProjects/app_name/dist/ into tomcat/webapps - the tomcat will create the appropriate folder with the files himself seconds later. 或者只是将NebeansProjects/app_name/dist/的war文件复制到tomcat/webapps中NebeansProjects/app_name/dist/将在几秒钟后自己创建带有文件的适当文件夹。
tl;dr: wrong deploment, copypaste war or web 's content. tl; dr：错误的部署，复制粘贴war或web内容。
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