[JAVA] Run JSP Hello World with Tomcat on Docker

When the response of JSP, which I rarely touch, suddenly came in, I was wondering what to do first, so I will leave it as a memo

What to use

Docker
Docker Compose

procedure

Prepare docker-compose.yml --Specify the official Docker image for Tomcat --Mount the webapps directory and start the tomcat container
Place the application directory under the webapps directory and place the JSP --This time, set it to helloworld
Start

Directory structure

├── docker-compose.yml
└── webapps
    └── `Application name`
        ├── WEB-INF
        │   └── lib
        │       └── `Required libraries such as JSTL`
        └── index.jsp

1. Prepare docker-compose.yml

As for the image of Tomcat, the official image is published on Docker Hub, so select the one you need and use it.

https://hub.docker.com/_/tomcat/

docker-compose.yml

version: '3'

services:
  tomcat:
    image: tomcat:9.0.13-jre11-slim
    volumes:
      - ./webapps:/usr/local/tomcat/webapps
    ports:
      - 8080:8080

2. Place the application directory under the webapps directory and place the JSP

webapps/helloworld/index.jsp

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>Hello, world!</title>
</head>
<body>
  <h1><%= "Hello, world!" %></h1>
</body>
</html>

3. Start

Go back to the directory where you put docker-compose.yml and run docker-compose up
You can check the operation by accessing localhost: 8080 / helloworld / index.jsp.

Other troubles

I was wondering how to run JSTL, but when I took the JSTL jar published on Maven and put it in WEB-INF / lib in the application, it worked.

jstl-1.2.jar http://central.maven.org/maven2/javax/servlet/jstl/1.2/
jstl-impl-1.2.jar http://central.maven.org/maven2/org/glassfish/web/jstl-impl/1.2/

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