import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.value.ObservableValue;

public class UnbindLeak {

    public static void main(String[] args) {
        ObservableValue<Boolean> p = new SimpleObjectProperty<Boolean>(true);
        BooleanProperty q = new SimpleBooleanProperty();

        reportMemoryUsage();

        for(int i = 0; i < 10_000_000; ++i) {
            q.bind(p);
            q.unbind();
        }

        reportMemoryUsage();
    }

    private static void reportMemoryUsage() {
        System.gc();
        Runtime runtime = Runtime.getRuntime();
        long used = runtime.totalMemory() - runtime.freeMemory();
        double mb = 1024*1024;
        System.out.printf("Used Memory after GC: %.2f MB\n", used / mb);
    }

}