Missing JavaFX application class com.MainApp

Question

I'm trying to migrate from java-1.8 to java-11.. I was facing the error "Missing JavaFX application class com.MainApp" and I looked for a solution online and found a couple of them:

https://openjfx.io/openjfx-docs/#modular

Maven JavaFx project compiles but running from console give "Missing JavaFX application class" error msg

The above approach is to "create a new main class and call the main method of a class which extends application"

However, I'm still facing below issues:

I am running it through the command line and using the below commands:

1.Java -jar abc.jar

Exception in thread "main" java.lang.NoClassDefFoundError: javafx/application/Application at java.base/java.lang.ClassLoader.defineClass1(Native Method) at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016) at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174) at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802) at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700) at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623) at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) at com.amx.rms.transporter.tools.config.MainDivert.main(MainDivert.java:7) Caused by: java.lang.ClassNotFoundException: javafx.application.Application at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ... 10 more

2.java --module-path "C:\Program Files\Java\javafx-sdk-11.0.2\lib" --add-modules=javafx.controls,javafx.fxml,javafx.base,javafx.media,javafx.web,javafx.swing -jar abc.jar

Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/core/Context at com.amx.rms.transporter.tools.config.MainDivert.main(MainDivert.java:7) Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.Context at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ... 1 more

Below is my new main class:

public class MainDivert {

    public static void main(String[] args) throws Exception {
        try {
            MainApp.main(args);
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }
}

Not sure what I'm missing?

Jochen Reinhardt Jochen Reinhardt · Accepted Answer · 2019-11-18T12:16:39

Your second approach looks quite promising. You already managed to add the JavaFX modules. So that's working. It seems, you have a couple of other libs you depend on, like logback. You'll have to add them to the classpath (or modulepath) as well.

Gradle can actually manage all the dependencies for you. You could start your app using gradle run. See https://openjfx.io/openjfx-docs/#gradle

If you want to run the jar from the command line, you'll have to list all the dependencies in the classpath (module path) manually. This can be quite a pain.

Missing JavaFX application class com.MainApp

1 Answers