Issue
All i am trying to do is print a simple Hello world message , using a JSP page but when i try to do it,i get a 404 not found error as shown below 
this is my project structure, shown in the above diagram
package com.example.MailSender;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication(scanBasePackages = {"com.example.MailSender","com.example.MailSender.Controller"})
public class MailSenderApplication {
public static void main(String[] args) {
SpringApplication.run(MailSenderApplication.class, args);
}
}
the main application class is as shown above
package com.example.MailSender.Controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/hello")
public class SimpleController {
@GetMapping("/world")
public String sample()
{
return "sample";
}
}
A very simple controller that i coded is shown above
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Hello world</title>
</head>
<body>
<h1>Basic config successful!!!</h1>
<h2>Hello World</h2>
</body>
</html>
A very simple JSP page to show the message
server.port=9090
spring.mvc.view.prefix=/src/main/resources/static
spring.mvc.view.suffix=.jsp
this is the application.properties file
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>MailSender</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MailSender</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
the pom.xml file
i am unable to understand where i am going wrong, please help me out, why am i getting a 404 error ?? i belive http://localhost:9090/hello/world is a valid url
Solution
I see two issues.
- You need to add this dependency to your pom file
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
/src/main/resources/staticis meant to hold static files such ashtmlandcss
- Create directory
src/webapp/WEB-INF/jsp - Move your jsp into the above directory
- Update prefix
spring.mvc.view.prefix=/WEB-INF/jsp/
https://hellokoding.com/spring-boot-hello-world-example-with-jsp/
Answered By - eHayik
Answer Checked By - Pedro (JavaFixing Volunteer)
