Mixing Java and JavaFX

Question

Hola!
I wondered how I could use a JavaFX class inside a Java class. Like this:
FXClass.fx
package fxpackage;
public class FXClass  {
    var chiquito: Integer;
JavaClass.java
package javapackage;
import fxpackage.FXClass;
public class JavaClass {
    FXClass fxVar;
}With this example, Netbeans marks the import statement as an error, arguing that the package "fxpackage" doesn't exist.
Am I doing something wrong? Or does a .java file not descry a package with no .java files??

Answer 1

Without testing anything something like that:
//Interface
public interface FXCall {
     public void call();
//JavaFX side
package test;
public class FXImpl implements FXCall {
     public override function call(): Void {
            Alert.inform("call from javaFX);
public class JavaTest {
     public static void main(String[] args) {
         FXObjectValue fxov = FXLocal.getContext().findClass("test.FXCall").newInstance();
         FXCall fxcall = (FXCall)fxov;
         com.sun.javafx.runtime.Entry.deferAction(new Runnable() {
            @Override
            public void run() {
                fxcall.call();
{code}