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Ubuntu – java.lang.NoClassDefFoundError caused by executable

I have downloaded a Linux executable for the program CircuitSim. You can see the downloads here:

https://www.roiatalla.com/public/CircuitSim/

I downloaded the version 1.6.2, hoping that I wouldn’t have problems with needing a newer version of Java.

My current version of Java is

$ java -version 
openjdk version "11.0.23" 2024-04-16
OpenJDK Runtime Environment (build 11.0.23+9-post-Ubuntu-1ubuntu122.04.1)
OpenJDK 64-Bit Server VM (build 11.0.23+9-post-Ubuntu-1ubuntu122.04.1, mixed mode, sharing)

I’ve marked the downloaded executable as an executable program, and then in a terminal ran ./CircuitSim1.6.2.

The response it gives is

Error: Could not find or load main class com.ra4king.circuitsim.gui.CircuitSim
Caused by: java.lang.NoClassDefFoundError: javafx/application/Application

I’m guessing this has something to do with this post: Caused by: java.lang.NoClassDefFoundError: javafx/application/Application

But I don’t understand pretty much anything that’s being said there, I’m not familiar with Java EE. But my guess is that the solutions there are relevant for when you’re calling on the Java compiler directly. Here, if I understand my situation a little, I’m calling an executable that’s calling the compiler — so I think I can’t use the solution there? I dunno.

Any help on how to run this program would be appreciated.

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2

Answers


  1. 0

    firstly,you can try again reload this jar,may you can maven clean let u know the local source not error; if error again after you done,try to read demo for javafx such as https://gitee.com/westinyang/javafx-jdk11-start, if always error again~ i guess maybe java compiler hadn’t choose the right classloader,u can try update your local jdk version,such as jdk 8;

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  2. 0

    Root cause:

    You have not installed and configured the JavaFX SDK.

    The easiest way:

    install a JDK that already integrates JavaFX.

    Use SDKMAN to install a JDK with JavaFX.

    You can use sdk list java and then look for files with xxx.fx.xxx in the name to select an installation.

    sdk install java 21.0.3.fx-zulu

    After the installation is complete, execute the following instructions:

    ./CircuitSim1.6.2

    enter image description here

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