Running Digital with Maven

[MarcinOrlowski]

I am trying to run Digital from withing InteliJ and from shell too, but it seems I got something incorrectly set up in terms of Maven which I am not really too familiar with. So far I edited pom.xml and added exec-maven-plugin:

                <plugin>
                    <groupId>org.codehaus.mojo</groupId>
                    <artifactId>exec-maven-plugin</artifactId>
                    <version>3.0.0</version>
                    <executions>
                        <execution>
                            <goals>
                                <goal>java</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <mainClass>de.neemann.digital.gui.Main</mainClass>
                    </configuration>
                </plugin>

to build/pluginManagement/plugins, however when I try:

mvn exec:java

I end up with java.lang.ExceptionInInitializerError (I shortened the stack trace manually):

[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------< de.neemann.digital:digital >---------------------
[INFO] Building Digital 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- exec-maven-plugin:3.0.0:java (default-cli) @ digital ---
[de.neemann.digital.gui.Main.main()] INFO de.neemann.gui.IconCreator - upscaling of media-playback-start.png
[WARNING] 
java.lang.ExceptionInInitializerError
at sun.misc.Unsafe.ensureClassInitialized (Native Method)
[...]
Caused by: java.lang.NullPointerException: resource media-playback-start.png not found!
at de.neemann.gui.IconCreator.getImage (IconCreator.java:71)
at de.neemann.gui.IconCreator.createImage (IconCreator.java:57)
at de.neemann.gui.IconCreator.create (IconCreator.java:35)
at de.neemann.digital.gui.Main.<clinit> (Main.java:106)
[...]
at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:254)
at java.lang.Thread.run (Thread.java:748)
[WARNING] thread Thread[Timer-0,5,de.neemann.digital.gui.Main] was interrupted but is still alive after waiting at least 15000msecs
[WARNING] thread Thread[Timer-0,5,de.neemann.digital.gui.Main] will linger despite being asked to die via interruption
[WARNING] NOTE: 1 thread(s) did not finish despite being asked to  via interruption. This is not a problem with exec:java, it is a problem with the running code. Although not serious, it should be remedied.
[WARNING] Couldn't destroy threadgroup org.codehaus.mojo.exec.ExecJavaMojo$IsolatedThreadGroup[name=de.neemann.digital.gui.Main,maxpri=10]
java.lang.IllegalThreadStateException
[...]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  15.935 s
[INFO] Finished at: 2021-06-09T12:33:37+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:java (default-cli) on project digital: An exception occured while executing the Java class. null: ExceptionInInitializerError: resource media-playback-start.png not found! -> [Help 1]

Any hints appreciated.

[hneemann]

Do not modify the pom.xml.
Create a new project in IDEA with "New->Project from Existing Sources". Then select the file pom.xml.
After that you can run the class de.neemann.digital.gui.Main.