README.md

maven-experiment

Understanding Maven source exclusion

Steps to run the source exclusion experiment:

Clone this repository:

$ cd && mkdir maven-experiment-clone && cd maven-experiment-clone && \
  git clone https://github.com/keghani/maven-experiment.git && cd maven-experiment

See pom.xml:

...
        <configuration>
          <directory>com/keghani/hello</directory>
        </configuration>
...

Generate the jar file:

$ mvn package
$ jar tf target/maven-experiment-1.0.0.jar

Check that you see Hello.class and Exclude.class.

$ java -cp target/maven-experiment-1.0.0.jar com.keghani.hello.Hello

Get "Hello".

$ java -cp target/maven-experiment-1.0.0.jar com.keghani.hello.Exclude

Get "Hello" again.

Update pom.xml to exclude Exclude.java:

...
        <configuration>
          <directory>com/keghani/hello</directory>

          <excludes>
            <exclude>com/keghani/hello/Exclude.java</exclude>
          </excludes>

        </configuration>
...

Confirm that the jar file now excludes Exclude.class:

$ mvn clean
$ ls

Check that the target directory is no longer present.

$ mvn package
$ jar tf target/maven-experiment-1.0.0.jar

Check that you see Hello.class but not Exclude.class.

$ java -cp target/maven-experiment-1.0.0.jar com.keghani.hello.Hello

Get "Hello".

Acknowledgements:

Thanks to @jias0001 for the references!

References:

• Maven in 5 Minutes
• Viewing the Contents of a JAR File
• Stackoverflow: "Maven: excluding java files in compilation"