Executable jar with dependencies and dll dependency using maven

I have a Java project using 4 OpenGL jars and 1 dll that I've received to work with as a Project for a course in Computer Graphics. I want to make maven build it for me into an executable jar so I could just git clone my repo from a different computer and build it using maven for execution. (Preferably using maven clean install)

What I did so far:

Installed the 4 jars and the dll into a local repository inside the project. This way, I am just setting the dependencies and the files are copied from the git repo, for example:

  <repositories>
      <repository>
          <id>local-maven-repo</id>
          <url>file:///${project.basedir}/local-maven-repo</url>
      </repository>
  </repositories>

  <dependencies>
      <dependency>
          <groupId>com.computer.graphics</groupId>
          <artifactId>jogl</artifactId>
          <version>1.0</version>
      </dependency>
      <dependency>
          <groupId>com.computer.graphics</groupId>
          <artifactId>gluegenrt</artifactId>
          <version>1.0</version>
          <scope>runtime</scope>
          <type>dll</type>
      </dependency>
      ...

Set maven assembly plugin with an assembly.xml in src/assembly.xml:

      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-assembly-plugin</artifactId>

          <configuration>
              <!--        Configure a class for executable jar        -->
              <archive>
                  <manifest>
                      <mainClass>Main class</mainClass>
                  </manifest>
              </archive>
              <!--          Points to the assembly descriptor to use          -->
              <descriptors>
                  <descriptor>src/assembly.xml</descriptor>
              </descriptors>
          </configuration>

          <!--        Bind goal assembly:single into build process        -->
          <executions>
              <execution>
                  <id>make-assembly</id> <!-- this is used for inheritance merges -->
                  <phase>package</phase> <!-- bind to the packaging phase -->
                  <goals>
                      <goal>single</goal>
                  </goals>
              </execution>
          </executions>
      </plugin>

Tried to include the jars and the dll into the executable jar:

<assembly xmlns="http://maven.apache.org/ASSEMBLY/2.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/ASSEMBLY/2.1.0 http://maven.apache.org/xsd/assembly-2.1.0.xsd">

    <id>graphics-assembly</id>
    <formats>
        <format>jar</format>
    </formats>
    <includeBaseDirectory>false</includeBaseDirectory>

    <dependencySets>
        <dependencySet>
            <outputDirectory>/</outputDirectory>
            <useProjectArtifact>true</useProjectArtifact>
            <scope>runtime</scope>
            <unpack>true</unpack>
            <includes>
                <include>*:jar:*</include>
            </includes>
        </dependencySet>
        <dependencySet>
            <outputDirectory>/</outputDirectory>
            <includes>
                <include>*:dll*</include>
            </includes>
        </dependencySet>
    </dependencySets>
</assembly>

From what I understood, the dll file should be in target folder near the executable jar, but even if I do copy manualy the file, when I try to run the jar using java -jar executable-jar.jar for example, I get the following error:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 1
        at jogamp.opengl.windows.wgl.awt.WindowsAWTWGLGraphicsConfigurationFactory.chooseGraphicsConfigurationImpl(WindowsAWTWGLGraphicsConfigurationFactory.java:170)
        at javax.media.nativewindow.GraphicsConfigurationFactory.chooseGraphicsConfiguration(GraphicsConfigurationFactory.java:422)
        at javax.media.opengl.awt.GLCanvas.chooseGraphicsConfiguration(GLCanvas.java:1516)
        at javax.media.opengl.awt.GLCanvas.addNotify(GLCanvas.java:614)
        at java.desktop/java.awt.Container.addNotify(Container.java:2801)
        at java.desktop/java.awt.Window.addNotify(Window.java:787)
        at java.desktop/java.awt.Frame.addNotify(Frame.java:493)
        at java.desktop/java.awt.Window.show(Window.java:1049)
        at java.desktop/java.awt.Component.show(Component.java:1720)
        at java.desktop/java.awt.Component.setVisible(Component.java:1667)
        at java.desktop/java.awt.Window.setVisible(Window.java:1032)

I am using intellij and simply linked the files using File -> Project Structure -> Libraries -> added the folder containing the jars and the dll. When I run / build the project using intellij, everything works.

What am I doing wrong? is there a better way to do that?

Solution

I ended up deleting the dependencySet of the dll from the assembly file and copy the dll dependency with maven-dependency-plugin as follow:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <version>3.1.2</version>
    <executions>
        <execution>
            <id>copy</id>
            <phase>package</phase>
            <goals>
                <goal>copy</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <artifactItems>
            <artifactItem>
                <groupId>com.computer.graphics</groupId>
                <artifactId>gluegenrt</artifactId>
                <version>1.0</version>
                <type>dll</type>
                <outputDirectory>${project.build.directory}</outputDirectory>
                <destFileName>gluegen-rt.dll</destFileName>
            </artifactItem>
        </artifactItems>
    </configuration>
</plugin>

The ArrayIndexOutOfBoundsException occurred because I was using jdk 16 instead of jdk 12 to run the jar. Hope this helps others.