Create jar file from sketch in java

Processing Coding Questions
1

Hi,

I am trying to pack this into a JAR file with IntelliJ IDEA (I can also change IDE if needed, but I d rather stick to this).
The project runs in the IDE if I run the file. Honestly, I don’t really know which is the entry point!

package main.com.test;
import processing.core.PApplet;

public class MyMain extends PApplet {

    public void settings() {
        size(500, 500);
    }

    public void draw(){
        background(64);
        ellipse(mouseX, mouseY, 20, 20);
    }

    public static void main (String... args) {
        MyMain pt = new MyMain();
        runSketch(new String[]{"myMain"}, pt);
    }

Following this guide [1] I created a Manifest file and added the processing library -that is exported into the correct folder under core.jar -

Manifest-Version: 1.0
Main-Class: main.com.test.MyMain

and the built the artifact (Build-> Artifacts) in IntelliJ

then from terminal run and obtain

$ java -jar out/artifacts/TestJar/archive.jar
Error: Could not find or load main class main.com.test.MyMain

I am sure it’s a stupid problem but I spent the last 5 hours of my life trying this and I am very frustrated.

Thanks,
Alessio
[1] Creating an Executable JAR in Intellij IDEA | Karthic Raghupahti

2

A more stable way to work is to use maven, then your not reliant on ide. Further I would expect your sketch to look like this:-

package main.com.test;
import processing.core.PApplet;


public class MyMain extends PApplet {
     public void settings() {
        size(500, 500);
    }

    public void draw(){
        background(64);
        ellipse(mouseX, mouseY, 20, 20);
    }

  static public void main(String[] passedArgs) {
    String[] appletArgs = new String[] { "main.com.test.MyMain" };
    if (passedArgs != null) {
      PApplet.main(concat(appletArgs, passedArgs));
    } else {
      PApplet.main(appletArgs);
    }
  }
}

Note the package name prefix in appletArgs. Now processing does not officially release maven artifacts, which is unfortunate, but there’s nothing stopping you creating your own (core.jar would be a start). The latest version available from maven central is 3.3.7 which might be good enough.
See snippet below showing part of pom.xml to create a main manifest using maven.

  <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <version>3.2.0</version>
        <configuration>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
              <mainClass>main.com.test.MyMain</mainClass>
            </manifest>
          </archive>
        </configuration>
      </plugin>
1 Like
3

Hi,

thanks a lot for your answer and time. From your suggestion to use a general framework I understood something important:
I should not use the Java interface to the Processing library if I have no idea about how Java works and I am not interested in it!

Indeed, I have no idea what else to write in the pom.xml file and the difference between a maven artifact and the core.jar file in the library folder.

Hence, I opened the code from the processing ide. -Which is not as pleasant and helpful as the IntelliJ ide-. Changet slightly the code. And run the ¨Export Application¨ in File.

Et voila´ I have the application in exe and bush files. Thank you, Processing developers, to make it easy.

The code is accessible from this shared folder till 1 May 2021

1 Like
5

Aww Man, that is awesome. I tried this oscilloscope a few months ago to understand the PPM signal of my RC receiver. It was a big help, thanks. It is a surprise to see it on this forum, but it is written in processing afterall.

EDIT: Wow, I unzipped the wrong application.linux64.zip and it was that oscilloscope. I unzipped your application and it’s still awesome. I like the graph. Nice. I assume e has something to do with population growth and stability.

1 Like