Folder Structure

The workspace contains two folders by default, where:

• src: the folder to maintain sources
• lib: the folder to maintain dependencies

Meanwhile, the compiled output files will be generated in the bin folder by default.

Dependency Management

The JAVA PROJECTS view allows you to manage your dependencies. More details can be found here.

Prerequisites

Install OpenJDK (Java Development Kit):

sudo apt-get update
sudo apt-get install openjdk-17-jdk openjdk-17-demo openjdk-17-doc openjdk-17-jre-headless openjdk-17-source

(also mentioned here: https://wiki.ubuntuusers.de/Java/Installation/OpenJDK/)

Check installation by

java -version
which javac

VS Code has already compiled the Java files for us (as mentioned above). They can be found in bin folder. Go to the root folder of the project.

Package the application by

jar cvf java-basics.jar -C bin .

Run the App by

java -classpath java-basics.jar com.bt.java.basics.App

Containerisation

Containerise the app by pulling a Java image from https://hub.docker.com/_/eclipse-temurin.

docker pull eclipse-temurin:17-jdk-alpine
docker build --tag java-basics:latest .

Run and check the java-basics container either by

docker run -d --name java-basics java-basics
docker logs java-basics

or

docker run java-basics