JavaFX hangs when called from Java

Question

Hello
I am developing a java application with a JavaFX gui, the communication from Java works with an java interface. The communication works,but after a few updates the javaFX code hangs and subsequently the Java code also hangs.
Is this a common problem, and so is there a common solution for this.

Answer 1

JavaFX UI calls need to be done on the Event Thread. So if your Java Application has multiple threads or runs on a different Thread to need to wrap all callbacks to JavaFX in a deferAction like this:
class YourFXClass extends YourJavaInterface {
   override public function someMethod(someArgument) {
        FX.deferAction(function() : Void {
              // doSomething with someArgument
    }