This is a Java 21 template with Maven and JUnit. It can be used to experiment with many modern Java features, and experience which functional features Java offers. You can use this template, for example, to build a compiler.

Building happens with make, running with ./hello. The project build process is executed via the Maven wrapper which means that you do not need Maven on your machine.

To execute the application, first build the application, then run it.

make
./hello Petra

Remember to update the pom.xml with your actual main class. If the class Hello in the package com.felixseifert.java contains the main method of your whole application, the Maven file should include the following line.

<mainClass>com.felixseifert.java.Hello</mainClass>

After running the command make in your home directory, Maven compiles a JAR of your application. To run this JAR via the provided executable script hello, change the name of the JAR in the script hello to the name of your compiled JAR. For the JAR name java-21-maven-project-1.0-SNAPSHOT, the script includes the following line.

exec java -jar target/java-21-maven-project-1.0-SNAPSHOT.jar "$@"

You can also rename the executable script. If the executable should be called hola, then run:

mv hello hola

To run the tests, execute make test. This will internally trigger the execution of make build before actually triggering the tests.

The tests are written with JUnit and can be found in the abstract class AbstractHelloTest. The same tests are executed in two different ways: once via calling the Java main method and once via calling the executable script (which calls the JAR). You can observe how the same tests use different configs via implementing abstract methods.