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Memory Leak in OrgChartDemo JavaFX when repeated add/clear

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I have a memory leak in my test app. I'm not sure I remove the objects the right way because the profiler shoes they do not get destroyed. My test is based on OrgChartDemo so I did the following to confirm (to your demo app)

I added a timer to re - add the contents every 5 seconds.

Call graph.clear() before adding it again.

Get Memory leak.

Added this to the end of the initialse function in OrgChartDemo.java:

    Timeline timeline = new Timeline(new KeyFrame(

        javafx.util.Duration.millis(5000),

        ae -> buildSampleGraph()));

    timeline.setCycleCount(Animation.INDEFINITE);

    timeline.play();      

  private void buildSampleGraph() {

    try {

      URL url = OrgChartDemo.class.getResource("resources/samplegraph.graphml");

      // create an IOHandler that will be used for all IO operations

      final GraphMLIOHandler ioh = new GraphMLIOHandler();

      // we set the IO handler on the GraphControl, so the GraphControl's IO methods

      // will pick up our handler for use during serialization and deserialization.

//-------> add this to clear old data:

      graphControl.getGraph().clear();

      graphControl.setGraphMLIOHandler(ioh);

      ioh.addXamlNamespaceMapping("http://www.yworks.com/yfiles-for-javafx/demos/OrgChartEditor/1.0", Employee.class);

      graphControl.importFromGraphML(url);

    } catch (IOException e) {

      e.printStackTrace(System.err);

    } catch(Exception e){

      e.printStackTrace();

    }

  }
closed with the note: Not a yEd question.
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