Create a Java Web Application using Embedded Tomcat

This tutorial will show you how to create a simple Java web application using embedded Tomcat.

Prerequisites

• Basic Java knowledge, including an installed version of the JVM and Maven.
• Basic Git knowledge, including an installed version of Git.
• A Java web application. If you don't have one follow the first step to create an example. Otherwise skip that step.

Skip The Application Creation

If you want to skip the creation steps you can clone the finished sample and then skip to the 'Deploy Your Application to Heroku' section:

$ git clone git@github.com:heroku/devcenter-embedded-tomcat.git

Follow the Guide

If you would like to create the application yourself, then follow the Dev Center guide on how to Create a Java Web Application using Embedded Tomcat.

how to run local

mvn package

からの

sh target/bin/webapp

-- または Spring Boot で起動 --

mvn spring-boot:run

もしくは

mvn package java -jar target/embeddedTomcatSample-1.0-SNAPSHOT.jar

（Heroku 環境変数 PORT を参照します）

-- Docker (local) --

Build

docker build -t embeddedtomcatsample:latest .

Run

docker run -p 8080:8080 -e PORT=8080 embeddedtomcatsample:latest

-- CI --

A basic GitHub Actions workflow has been added at .github/workflows/ci.yml to build the project and (optionally) build a Docker image.