JavaFX custom events with OSGi

Question

I am developing a JavaFX application which uses the Apache Felix OSGi framework. My issue is that when trying to register for a custom event the exception shown below is thrown.

org.apache.karaf.shell.support.MultiException: Error executing command on bundles:
    ...
Caused by: java.lang.NoClassDefFoundError: Could not initialize class swt6.componentmanager.gui.event.RemoveSensorEvent
    at swt6.componentmanager.gui.ComponentManagerGui.createSensorView(ComponentManagerGui.java:170) ~[?:?]
    at swt6.componentmanager.gui.ComponentManagerGui.createSensorActuatorContainer(ComponentManagerGui.java:159) ~[?:?]
    at swt6.componentmanager.gui.ComponentManagerGui.createRootContainer(ComponentManagerGui.java:91) ~[?:?]
    at swt6.componentmanager.gui.ComponentManagerGui.lambda$start$0(ComponentManagerGui.java:62) ~[?:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[?:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[?:?]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[?:?]
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[?:?]
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) ~[?:?]
    at com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$11(GtkApplication.java:277) ~[?:?]
    ... 1 more

The code for registering for the custom event is shown below, too.

private Node createSensorView() {
    var container = new VBox();
    container.getChildren().add(JavaFXUtil.createHeading("Sensors"));
    var sensorTable = new SensorsTable(this.sensors);
    sensorTable.addEventHandler(
            RemoveSensorEvent.REMOVE_SENSOR_EVENT_TYPE,
            this::onRemoveSensor
    );
    container.getChildren().add(sensorTable);
    return container;
}

The code of the class RemoveSensorEvent is also illustrated below.

package swt6.componentmanager.gui.event;

import javafx.event.Event;
import javafx.event.EventType;
import swt6.sensor.Sensor;

public class RemoveSensorEvent extends Event {
    public static final EventType<RemoveSensorEvent> REMOVE_SENSOR_EVENT_TYPE =
            new EventType<>(Event.ANY, "REMOVE_SENSOR");

    private final Sensor sensor;

    public RemoveSensorEvent(Sensor sensor) {
        super(REMOVE_SENSOR_EVENT_TYPE);

        this.sensor = sensor;
    }

    public Sensor getSensor() {
        return this.sensor;
    }
}

The bundle which contains the JavaFX code has the following package layout; all these packages are located in the same bundle:

swt6.componentmanager.gui
    ComponentManagerGui.java
    swt6.componentmanager.gui.event
        RemoveSensorEvent.java
    swt6.componentmanager.gui.component
    swt6.componentmanager.gui.viewmodel

As RemoveSensorEvent is part of the package swt6.componentmanager.gui.event, which is located within the same bundle as the code invoking it (swt6.componentmanager.gui.ComponentManagerGui.java), there should not be any issue with loading the class definition; for instance, classes located in swt6.componentmanager.gui.component and swt6.componentmanager.gui.viewmodel can be accessed from swt6.componentmanager.gui with no problems. Does this have something to do with JavaFX trying to access RemoveSensorEvent using reflection?

JavaFX custom events with OSGi

0 Answers0