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I am trying to build the sample javaFX application in the Intellij 2018.3 IDE. I have installed the oracle JDK11, and downloaded openjfk11. I created a library linked to the javafx sdk and added the line:

--module-path=${PATH_TO_FX} --add-modules=javafx.controls,javafx.fxml

... to the VM options line. PATH_TO_FX is defined as an environment variable pointing to my javaFX folder.

I have searched through a number of postings on this site, including This solution to my exact error message. The odd thing I cannot figure out is, This solution works for me if there is no build directory. But if I have already built the project once, it then refuses to run and gives me the stated error. If I delete the build directory and try again, then the program runs correctly again.

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  • Sounds like you need to do a clean on the build directory when running your application. Commented Dec 5, 2018 at 20:59
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    Shouldn't the IDE take care of that for me? I have manually cleaned build directories when I build on the command line, but When using intellij in the past I never had to do anything more than hit the run button to rerun my programs. Commented Dec 6, 2018 at 23:30
  • In my case, Intellij was storing the wrong PATH_TO_FX in IntelliJ->File->Settings->Appearance & Behavior->Path Variables. Changing / removing this path fixed my problem. Commented May 25, 2020 at 15:25

5 Answers 5

Reset to default
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if you use IntelliJ , you must delete module-info.java in src/main/java, i did and it works, this file is automatically generated when you create javafx project

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1 Comment

You sir, are the life saver! THIS FUCKING WORKED! Thanks! This should be marked as the correct answer!
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Try adding path to JavaFX SDK lib folder instead of just the JavaFX SDK. It worked for me.

ex:

--module-path C:\javaFX\javafx-sdk-11.0.2\lib --add-modules javafx.controls,javafx.fxml

*Replace the "C:\javaFX\javafx-sdk-11.0.2\lib" part with the path to your javaFX SDK "lib" folder.

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You should not use VM Path if you define exports and opens in module-info.java. Because VM Path is essential if do not explicitly define module. Then IntelliJ internally creates a module for us.

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Well It looks like I just goofed up something with the output directory because this morning I tried resetting the build path to the default and it just started working.

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Confirm if you didnt add the javafx sdk to the class path instead of the modulepath

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