Processing 4.4.4 in Eclipse IDE 2025-06 (4.36.0) can't find PApplet

Processing
1

Hi there,

i am trying to get Processing 4.4.4 to run in Eclipse IDE 2025-06 (4.36.0). I have installed both programs and also installed the JDK 24 for Windows.

  • I have choosen the JDK 24 at windows → preferences → java .-> installed JREs inside Eclipse

  • Then i have added the core-4.4.4.jar library to the Project Java Build path

When i am trying t o Build a Test Applet i can choose the processing.core.PApplet as superclass.
But in the IDE PApplet Class seems to be not found by Eclipse:

ProcessingINEclipse
ProcessingINEclipse1920×1040 104 KB

So I hope someone could help me to solve this problem!

2

I just tried this on a Windows 11 system and my file system looks a little different than what you are using:

eclipse
eclipse2306×961 179 KB

I started off with a File/New/JavaProject. I don’t think that module-info should be in there; I had to make several tries to get it to work.

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3

Hi @cvconnector and welcome to the forum!

One more thing to note: if you’re open to using a build system like Maven or Gradle, you can skip downloading the .jar manually. Processing is available via Maven Central.

image
image1920×1199 90.4 KB

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4

ok. I have removed the module-info… Seems to work now. Thanks!

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5

Thanks! Have not used Maven or Gradle as yet. Is there any Tutorial how to setup Maven or Gradle for Processing in Eclipse?

6

Not yet! But here’s how I got it to work. Please note that I’m not a regular Eclipse user so I might have missed some steps when writing this down.

  1. Create a new Gradle project File → New → Other... then under Gradle select Gradle Project. Give it a name like my-project-name for example.

  2. Go to File → Open Projects from File System... then under Import source: click Directory and navigate to your project folder then click Finish.

  3. Create a src/main/java/sketch/MainSketch.java file and write/paste your code

  4. In your project, create two files: settings.gradle.kts and build.gradle.kts (see below)

  5. Right click your project and click Gradle → Refresh Gradle Project

  6. Right click src and got to Source → Select as source folder

  7. Click the run button

Files

settings.gradle.kts

rootProject.name = "my-project-name"

build.gradle.kts

plugins {
    application
    java
}

repositories {
    mavenCentral()
    maven {
        url = uri("https://jogamp.org/deployment/maven/")
    }
}

dependencies {
    implementation("org.processing:core:4.4.4")
}

application {
    mainClass.set("sketch.MainSketch")
}
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