looking for best practices on the display of the data inside a TableView

I have an app that can extract one ore more of 300,000 lines as a result of a request, and I am their display in a TableView... I use a mechanism to bring the data "off-site", when I do the query, an object with the ID of the lines is set in memory and a 'queryResultKey' went to start asking for the data set.
The controllers send the queryResultKey saying the DAO that she already results N, the DAO will return X records (from N + 1 to N + J) or less if the total number of records is reached. At this point, records are added to the elements of the table view using an addAll to list related to the itemsProperty table.
It works very well for early records already, but all of a sudden a Null pointer Exception is raised:

ene 15, 2013 12:56:40 PM mx.gob.scjn.iusjfx.presentacion.tesis.TablaResultadosController$5 call
SEVERE: null
java.lang.NullPointerException
     at com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:291)
     at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:48)
     at com.sun.javafx.scene.control.ReadOnlyUnbackedObservableList.callObservers(ReadOnlyUnbackedObservableList.java:74)
     at javafx.scene.control.TableView$TableViewArrayListSelectionModel$3.onChanged(TableView.java:1725)
     at com.sun.javafx.collections.ListListenerHelper$SingleChange.fireValueChangedEvent(ListListenerHelper.java:134)
     at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:48)
     at com.sun.javafx.collections.ObservableListWrapper.callObservers(ObservableListWrapper.java:97)
     at com.sun.javafx.collections.ObservableListWrapper.clear(ObservableListWrapper.java:184)
     at javafx.scene.control.TableView$TableViewArrayListSelectionModel.quietClearSelection(TableView.java:2154)
     at javafx.scene.control.TableView$TableViewArrayListSelectionModel.updateSelection(TableView.java:1902)
     at javafx.scene.control.TableView$TableViewArrayListSelectionModel.access$2600(TableView.java:1681)
     at javafx.scene.control.TableView$TableViewArrayListSelectionModel$8.onChanged(TableView.java:1802)
     at com.sun.javafx.scene.control.WeakListChangeListener.onChanged(WeakListChangeListener.java:71)
     at com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:291)
     at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:48)
     at com.sun.javafx.collections.ObservableListWrapper.callObservers(ObservableListWrapper.java:97)
     at com.sun.javafx.collections.ObservableListWrapper.addAll(ObservableListWrapper.java:171)
     at com.sun.javafx.collections.ObservableListWrapper.addAll(ObservableListWrapper.java:160)
     at javafx.beans.binding.ListExpression.addAll(ListExpression.java:280)
     at mx.gob.scjn.iusjfx.presentacion.tesis.TablaResultadosController$5.call(TablaResultadosController.java:433)
     at mx.gob.scjn.iusjfx.presentacion.tesis.TablaResultadosController$5.call(TablaResultadosController.java:427)
     at javafx.concurrent.Task$TaskCallable.call(Task.java:1259)
     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
     at java.util.concurrent.FutureTask.run(FutureTask.java:166)
     at java.lang.Thread.run(Thread.java:722)

This exception multibordure inside the Thread that fills the table:

task = new Task<Integer>() {
            @Override
            protected Integer call() throws Exception {
                while (listaTesis.size() < pag.getLargo()) {
                    List<TesisTO> tesisParaincrustar = fac.getTesisParaLista(pag.getId(), listaTesis.size());
                    try {
                        listaTesis.addAll(tesisParaincrustar);
                    } catch (Exception exc) {
                        Logger.getLogger(TablaResultadosController.class.getName()).log(Level.SEVERE, null, exc);
                    }
                    tesisActuales.addAll(tesisParaincrustar);
                    updateProgress(listaTesis.size(), pag.getLargo());
                }

                return new Integer(100);
            }

            @Override
            protected void succeeded() {
                status.getProgreso().setVisible(false);
                preparaFiltros();
                llenandoTabla = false;
                tblResultados.getSelectionModel().select(0);
            }
        };
        status.getProgreso().progressProperty().bind(task.progressProperty());
        new Thread((Runnable) task).start();

So that may be another strategy to simulate (or have) all the registry values are in memory and 'capture only the necessary links' to display them in the TableView?
Any idea will be useful.

The first thing I would do here is to check that

fac.getTesisParaLista(pag.getId(), listaTesis.size())

cannot return null in all circumstances. If it returns null, then it is the source of your exception. In this case, you must add the caution appropriate to your code:

if (tesisParaincrustar != null) {
                    try {
                        listaTesis.addAll(tesisParaincrustar);
                    } catch (Exception exc) {
                        Logger.getLogger(TablaResultadosController.class.getName()).log(Level.SEVERE, null, exc);
                    }
                    tesisActuales.addAll(tesisParaincrustar);
}

For the number of thread, you can plan everything which modifies the user interface to run on the Thread of the FX Application using Platform.runLater (...). Note that any data that you pass into that must not be changed elsewhere. If you can do something like:

Platform.runLater(new Runnable() {
  @Override
  public void run() {
                    try {
                        listaTesis.addAll(tesisParaincrustar);
                    } catch (Exception exc) {
                        Logger.getLogger(TablaResultadosController.class.getName()).log(Level.SEVERE, null, exc);
                    }
                    tesisActuales.addAll(tesisParaincrustar);
  }
});

You need to add the 'final' keyword to the declaration of tesisParaincrustar to get this to compile.

That's fine, assuming that the call to fac.getTesisParaLista (...) returns a new instance of the list each time (i.e. it does not change an existing list).

You'll end up with only one problem: the condition in your while loop (...) refers to listaTesis.size (). Given that this list is now updated on a different thread to the thread of the while loop (...) management. This can (and probably won't be) cause the loop to terminate at the wrong time. You can adjust the condition while (...) so it does not refer to this list (for example, advance calculate how many things must be read, give this number to your implementation of the task and use it in the while condition (...).)

There are actually two rules for multithreading in JavaFX:
1. do not access the user interface outside the FX request Thread. This includes data related to the user interface structures. I guess at some point you have called tableView.setItems (listaTesis), so listaTesis should be considered as part of the user interface.
2. don't run long running on the Thread of the FX Application tasks.

In trying to comply with rule 2, you have violated rule 1.

The incremental updates to a list that appears in a background thread is one of the most delicate uses of the task. Read the documentation of the API for task (http://docs.oracle.com/javafx/2/api/javafx/concurrent/Task.html): the example of "PartialResultsTask" under "a task that returns partial causes" is an example of what you're trying to do.

Tags: Java

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