Spring Boot - 无法解决白标签错误页面
[英]Spring Boot - Unable to resolve Whitelabel Error Page
问题描述
I am trying to run a simple Spring boot application from 2 days but still unable to make it work.
我试图从 2 天开始运行一个简单的 Spring 启动应用程序，但仍然无法使其工作。 I checked all the related questions and blogs but still issue persist.我检查了所有相关的问题和博客，但问题仍然存在。
My project structure appears as below.我的项目结构如下所示。
POM.xml POM文件
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
</dependencies>
WebApplication.java网络应用程序
@SpringBootApplication
public class WebApplication extends SpringBootServletInitializer{
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
return builder.sources(WebApplication.class);
}
public static void main(String[] args) {
SpringApplication.run(WebApplication.class, args);
}
}
Application.properties应用程序属性
server.servlet.context-path=/EBS-web
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp
logging.level.org.springframework.web=DEBUG
LoginController登录控制器
@Controller
public class LoginController {
@RequestMapping(path="/")
public String login() {
System.out.println("******************logging************************");
return "login";
}
}
Login.jsp登录.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Hi Login
</body>
</html>
Whenever I try to run the application as Spring Boot App (STS plugin for Eclipse) and access the http://localhost:8080/EBS-web/ It gives below error message on UI每当我尝试将应用程序作为 Spring Boot App（Eclipse 的 STS 插件）运行并访问http://localhost:8080/EBS-web/它在 UI 上给出以下错误消息
Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sun Sep 23 17:34:52 IST 2018 There was an unexpected error (type=Not Found, status=404).
From the below stack trace, I can see spring is able to fetch the handler method but not able to find the associated view.从下面的堆栈跟踪中，我可以看到 spring 能够获取处理程序方法，但无法找到关联的视图。
2018-09-23 17:44:12.248 DEBUG 14728 --- [nio-8080-exec-2] osweb.servlet.DispatcherServlet : Last-Modified value for [/EBS-web/] is: -1
******************logging************************
2018-09-23 17:44:12.258 DEBUG 14728 --- [nio-8080-exec-2] oswsvContentNegotiatingViewResolver : Requested media types are [text/html, application/xhtml+xml, image/webp, image/apng, application/xml;q=0.9, / ;q=0.8] based on Accept header types and producible media types [ / ]) 2018-09-23 17:44:12.258 DEBUG 14728 --- [nio-8080-exec-2] oswservlet.view.BeanNameViewResolver : No matching bean found for view name 'login' 2018-09-23 17:44:12.260 DEBUG 14728 --- [nio-8080-exec-2] oswsvContentNegotiatingViewResolver : Returning [org.springframework.web.servlet.view.JstlView: name 'login';
4 个解决方案
解决方案1
3 2020-01-05 05:41:32
Add @RestController instead of @Controller .添加@RestController而不是@Controller 。 Then run your Java application.然后运行您的 Java 应用程序。 this should solve the WhiteLabel error这应该可以解决WhiteLabel错误
解决方案2
2 已采纳 2018-09-23 12:29:41
Please define method in your controller: You may define @RequestMapping(value = "/", method = RequestMethod.GET) or you may directly use @GetMapping请在你的控制器中定义方法：你可以定义@RequestMapping(value = "/", method = RequestMethod.GET)或者你可以直接使用@GetMapping
@Controller
public class LoginController {
@GetMapping(path="/")
public String login() {
System.out.println("******************logging************************");
return "login";
}
}
there might be some more conflicts in your pom, like no need add tomcat dependency as its already embedded so below can be removed.您的 pom 中可能存在更多冲突，例如无需添加 tomcat 依赖项，因为它已经嵌入，因此可以删除以下内容。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
To enable support for JSP's, add a dependency on tomcat-embed-jasper.要启用对 JSP 的支持，请添加对 tomcat-embed-jasper 的依赖。
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
and after 2.x release no need to extend SpringBootServletInitializer so below should be sufficient to start.并且在 2.x 版本之后不需要扩展SpringBootServletInitializer所以下面应该足以启动。
@SpringBootApplication
public class WebApplication{
public static void main(String[] args) {
SpringApplication.run(WebApplication.class, args);
}
}
解决方案3
1 2019-03-15 11:11:57
Please make sure all the classess are under the root package.请确保所有类都在根包下。 I spent hours in this error.我在这个错误上花了几个小时。 My application was running on self defined port 8085,but while hitting that port there was no response.我的应用程序在自定义端口 8085 上运行，但是在访问该端口时没有响应。 i was not getting error in the console.我没有在控制台中收到错误。 after restructuring the package under root package.在root包下重组包后。 Error is Resolved!!!!!!!!!!错误已解决！！！！！！！！！！
Happy Learning :)快乐学习:)
Regards, Vicky Sharma问候， 维姬·夏尔马
解决方案4
0 2019-11-30 20:19:11
只需在主生成的包中添加您的类文件，然后错误就会得到解决。
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