How to fix “Unable to derive module descriptor for .jar file” error in fxml

问题

I would like to get an image from JAR library to my project.

    <graphic>
        <ImageView>
            <Image url="@/toolbarButtonGraphics/general/TipOfTheDay24.gif"/>
        </ImageView>
    </graphic>

I've added the library to my module and it seemed to be correct but the compiler throws an error: Error occurred during initialization of boot layer java.lang.module.FindException: Unable to derive module descriptor for filepath.jar Caused by: java.lang.IllegalArgumentException: jlfgr.1.0: Invalid module name: '1' is not a Java identifier. Here's my module-info file:

requires javafx.fxml;
requires javafx.controls;

opens sample;

Thanks for any help!

回答1:

it seems like you did not follow the steps properly. When you add a new library, first, you add it to your module and then you have to add it to you module-info file.

Just add a line in module-info ---> requires <package-name>;

e.g my package name is graphics-looks.jar ---> requires graphics-looks;

P.S. before adding that jar anywhere, try to rename it and give a simple name by removing numbers and other characters from its name.