Spring Boot - where to place the jsp files

Question

I am trying to develop a new Spring boot application using MVC as a first step to move my existing Spring MVC application to Spring boot.

However, I am facing an is

Answer 1

I am facing The Same issue and I remove this problem by following changes:

@SpringBootApplication
public class MyFirstAppApplication extends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(MyFirstAppApplication.class, args);
    }
}

protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(MyFirstAppApplication.class);
}

No need to make ServletInitializer new class.

Answer 2

The issue was with the version of jar spring-boot-starter-parent. For some reason this doesn't work with the version 1.5.3 RELEASE. It works until version 1.5.2 RELEASE.

I have updated the pom.xml's parent tag as below:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

Answer 3

Why do have two separate java classes(MyFirstAppApplication,ServletInitializer) extending SpringBootServletInitializer class ?

Remove ServletInitializer.java & move configure method from ServletInitializer to MyFirstAppApplication.

Answer 4

There is a dependency to include as Spring boot doesn't know how to translate JSP to Servlet. So,

1. Check the version of your tomcat-embed-core-.jar.

2. Go to that corresponding version release on https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-jasper

3. Copy the dependency, it will look like-

<dependency>
        <groupId>org.apache.tomcat</groupId>
        <artifactId>tomcat-jasper</artifactId>
        <version>9.0.37</version> 
</dependency> 

here version needs to be updated as per your tomcat-embed-core jar version

4. Update Maven Project so that it can download the jar from repo.

Now you are good to go with your project.

thanKs.

Answer 5

I have gone exactly the same path. Upgrading a jsp, xml-based spring application to spring boot 2. There are few things you need to consider when migrating:

First remove @EnableWebMvc.

Second you need @ComponentScan on top of MyFirstAppApplication class.

Try to read this article, it helped me alot https://htr3n.github.io/2018/12/jsp-spring-boot/

Third you also need this dependeny together with embed-jasper:

<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-core</artifactId>
<version>9.0.22</version>
</dependency>

Last but not least this is a shortcut for creating a view handler in java

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

and as far as I know it only works in spring boot 2. You can have Java implementation instead and debug it to see if it ever hit that.

@Override
public void configureViewResolvers(ViewResolverRegistry registry) {
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setPrefix("/WEB-INF/jsp/");
    resolver.setSuffix(".jsp");       
    registry.viewResolver(resolver);
}

Because in my case for example I didn't even need a specific or default resolver. I had different resolver for each Controller that I had to define in xml/bean and inject in each class.

Answer 6

I have created a demo project which is rendering jsp

Git URL : https://github.com/rksharma1401/spring-boot-war

take checkout then mvn package java -jar target\simple-web-app-tomcat-0.0.1-SNAPSHOT.war URL : http://localhost:8081/w