JSP with Spring Boot

user_14217012 0
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I am trying to use jsp in my project, but it is difficult. I put these two dependencies in the pom.xml

<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-jasper</artifactId>
    <scope>provided</scope>
</dependency>

<!-- If you want to use JSTL -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
</dependency>

Then I put these two lines in the aplication.properties

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

I created a page with the name "index.jsp" and put that

<h1>
   INDEX
</h1>

<p>
   Lorem, ipsum dolor sit amet consectetur adipisicing elit. Aspernatur nam, nisi, repudiandae illum 
   ab a aut maxime deleniti voluptas praesentium dicta delectus. Voluptatibus consequuntur 
   necessitatibus hic eum suscipit, sequi autem.
</p>

And my controller:

package com.example.curso.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class IndexController {

    @GetMapping("/")
    public String index() {
        return "index";
    }
}

And the error when I try to access the route enter image description here

spring-boot spring jsp
1 Answers

Based on your stacktrace, it looks Thymeleaf is configured as rendering engine/view resolver. It might be because you have spring-boot-starter-thymeleaf in your classpath and spring boot auto configured it.

JSP support has been dropped from Spring Boot in newer versions. So, you will need manually configure few things to make it work.

If you want to use jsp instead of thymeleaf as your primary rendering engine, remove the spring-boot-starter-thymeleaf from your dependency and copy your .jsp files under webapp folder as below:

application.properties:

spring.mvc.view.prefix:/jsp/
spring.mvc.view.suffix:.jsp

Folder structure:

├── pom.xml
├── src
│   └── main
│       ├── java
│       │   └── gt
│       │       └── SpringBootWebApplication.java
│       ├── resources
│       │   └── application.properties
│       └── webapp
│           ├── css
│           │   └── main.css
│           └── jsp
│               └── welcome.jsp

Required dependencies:

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
            <scope>provided</scope>
        </dependency>

welcome.jsp

<!DOCTYPE html>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html lang="en">
<head>
    <c:url value="/css/main.css" var="jstlCss"/>
    <link href="${jstlCss}" rel="stylesheet"/>
</head>
<body>
    <h2>Message: ${msg}</h2>
</body>

</html>

@Controller:

    @RequestMapping("/")
    String welcome(Model m) {
        m.addAttribute("msg", "Hello");
        return "welcome";
    }

Run using mvn spring-boot:run

Running the @SpringBootApplication's main method might not work

user_6076370
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