java - que - No se puede obtener ArrayIndexOutOfBoundsException de Future<?> Y SwingWorker si el hilo se inicia Executor

swingworker java ejemplo

Question

Juego con Multitreading para SwingWorker usando Executor, y estoy allí por error, identifiqué elementos incorrectos del Vector, parece que este código ignora bastante ese elemento en Vector no existe

mi pregunta -> cómo / es posible atrapar esta (s) excepción (es) de alguna manera

salida simple

run:
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
BUILD SUCCESSFUL (total time: 11 seconds)

por comentario

//changeTableValues1(); // un-comment for get ArrayIndexOutOfBoundsException

todo es correcto, obtengo ArrayIndexOutOfBoundsException y el resultado es

run:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 2
at java.util.Vector.get(Vector.java:694)
at KondorExport.Util.Help.Table.TableWithExecutor.changeTableValues1(TableWithExecutor.java:70)
at KondorExport.Util.Help.Table.TableWithExecutor.access$100(TableWithExecutor.java:18)
at KondorExport.Util.Help.Table.TableWithExecutor$2.actionPerformed(TableWithExecutor.java:61)
at javax.swing.Timer.fireActionPerformed(Timer.java:271)
at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
BUILD SUCCESSFUL (total time: 10 seconds)

del código

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import java.util.Vector;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import javax.swing.*;
import javax.swing.table.*;
public class TableWithExecutor extends JFrame {
private static final long serialVersionUID = 1L;
private String[] columnNames = {"Narrative", "Description"};
private Object[][] data = {{"About", "About"}, {"Add", "Add"}};
private JTable table;
private Executor executor = Executors.newCachedThreadPool();
private Timer timerRun;
private int delay = 3000;
private Vector<String> fwDeals;
private Vector<String> fwDeals1;
public TableWithExecutor() {
DefaultTableModel model = new DefaultTableModel(data, columnNames);
table = new JTable(model) {
private static final long serialVersionUID = 1L;
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane, BorderLayout.CENTER);
prepareStartShedule();
}
private void prepareStartShedule() {
timerRun = new javax.swing.Timer(delay, startCycle());
timerRun.setRepeats(true);
timerRun.start();
}
private Action startCycle() {
return new AbstractAction("Start Shedule") {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
executor.execute(new TableWithExecutor.MyTask("StartShedule")); //non on EDT
//changeTableValues1(); // un-comment for get ArrayIndexOutOfBoundsException
}
};
}
private void changeTableValues1() {
fwDeals1 = new Vector<String>();
fwDeals1.add("First"); // ElementAt(0)
fwDeals1.add("Second");// ElementAt(1)
checkDealsInDb1(fwDeals1.get(1), fwDeals1.get(2));
}
private void checkDealsInDb1(String Str, String Str1) {
table.getModel().setValueAt(Str, 0, 1);
table.getModel().setValueAt(Str1, 1, 1);
}
private void changeTableValues() {
fwDeals = new Vector<String>();
fwDeals.add("First"); // ElementAt(0)
fwDeals.add("Second");// ElementAt(1)
checkDealsInDb(fwDeals.get(1), fwDeals.get(2));
}
private void checkDealsInDb(String Str, String Str1) {
table.getModel().setValueAt(Str, 0, 1);
table.getModel().setValueAt(Str1, 1, 1);
}
public static void main(String[] args) {
TableWithExecutor frame = new TableWithExecutor();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setLocation(150, 150);
frame.pack();
frame.setVisible(true);
}
private class MyTask extends SwingWorker<Void, Integer> {
private String str;
private String namePr;
MyTask(String str) {
this.str = str;
addPropertyChangeListener(new SwingWorkerCompletionWaiter(str, namePr));
}
@Override
protected Void doInBackground() throws Exception {
if (str.equals("StartShedule")) {
changeTableValues();
}
return null;
}
@Override
protected void process(List<Integer> progress) {
}
@Override
protected void done() {
if (str.equals("StartShedule")) {
}
}
}
private class SwingWorkerCompletionWaiter implements PropertyChangeListener {
private String str;
private String namePr;
SwingWorkerCompletionWaiter(String str, String namePr) {
this.str = str;
this.namePr = namePr;
}
SwingWorkerCompletionWaiter(String namePr) {
this.namePr = namePr;
}
@Override
public void propertyChange(PropertyChangeEvent event) {
if ("state".equals(event.getPropertyName()) && SwingWorker.StateValue.DONE == event.getNewValue()) {
System.out.println("Thread Status with Name :" + str + ", SwingWorker Status is " + event.getNewValue());
} else if ("state".equals(event.getPropertyName()) && SwingWorker.StateValue.PENDING == event.getNewValue()) {
System.out.println("Thread Status with Mame :" + str + ", SwingWorker Status is " + event.getNewValue());
} else if ("state".equals(event.getPropertyName()) && SwingWorker.StateValue.STARTED == event.getNewValue()) {
System.out.println("Thread Status with Name :" + str + ", SwingWorker Status is " + event.getNewValue());
} else {
System.out.println("SomeThing Wrong happends with Thread Status with Name :" + str);
}
}
}
}

EDITAR:

añadido relanzado desde Future # get () en método done () (por @takteek excelente sugerencia)

@Override
protected void done() {
if (str.equals("StartShedule")) {
try {
get();
//errLabel.setText(String.valueOf(get()));
} catch (InterruptedException ie) {
ie.printStackTrace();
} catch (ExecutionException ee) {
ee.printStackTrace();
}catch (IllegalStateException is) {
is.printStackTrace();
}
}
}

pero el resultado es fijo y solo Got exception , sería tan difícil obtener cualquier excepción de este BlackBox

run:
Got exception
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
Got exception
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
Got exception
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
Got exception
Thread Status with Name :StartShedule, SwingWorker Status is STARTED
Thread Status with Name :StartShedule, SwingWorker Status is DONE
BUILD SUCCESSFUL (total time: 13 seconds)

Answer 1

Creo que el problema al que te estás enfrentando es que las excepciones detectadas en el hilo de fondo solo se vuelven a lanzar si llamas a get() cuando se completa el proceso. Este parece ser un problema común con SwingWorker.

Puede cambiar su función done() a:

@Override
protected void done() {
if (str.equals("StartShedule")) {
try {
get();
}
catch (Exception ex) {
// This exception was thrown during processing
ex.printStackTrace();
}
}
}

done() se ejecuta en el hilo de envío del evento para que pueda visualizar los mensajes de error que necesite desde allí. Espero que eso ayude a algunos.

Answer 2

No estoy seguro de que agregue mucho, pero obtuve la Causa esperada Caused by usar la variación de la respuesta de takteek que se muestra a continuación. Lo ejecuté desde la línea de comando para asegurarme de que el IDE no estaba "ayudando".

$ java -cp build/classes TableWithExecutor StartShedule: PENDING -> STARTED java.util.concurrent.ExecutionException: java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 2 at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222) at java.util.concurrent.FutureTask.get(FutureTask.java:83) at javax.swing.SwingWorker.get(SwingWorker.java:582) at TableWithExecutor$MyTask.done(TableWithExecutor.java:103) at javax.swing.SwingWorker$5.run(SwingWorker.java:717) at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(SwingWorker.java:814) at sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:95) at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(SwingWorker.java:824) at javax.swing.Timer.fireActionPerformed(Timer.java:291) at javax.swing.Timer$DoPostEvent.run(Timer.java:221) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:677) at java.awt.EventQueue.access$000(EventQueue.java:85) at java.awt.EventQueue$1.run(EventQueue.java:638) at java.awt.EventQueue$1.run(EventQueue.java:636) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:647) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) Caused by: java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 2 at java.util.Vector.get(Vector.java:694) at TableWithExecutor.changeTableValues(TableWithExecutor.java:64) at TableWithExecutor.access$100(TableWithExecutor.java:14) at TableWithExecutor$MyTask.doInBackground(TableWithExecutor.java:92) at TableWithExecutor$MyTask.doInBackground(TableWithExecutor.java:80) at javax.swing.SwingWorker$1.call(SwingWorker.java:277) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at javax.swing.SwingWorker.run(SwingWorker.java:316) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:680) StartShedule: STARTED -> DONE

Código completo:

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import javax.swing.*;
import javax.swing.table.*;
/** @see https://.com/questions/7054627 */
public class TableWithExecutor extends JFrame {
private static final int delay = 1000;
private static final DateFormat df = DateFormat.getTimeInstance();
private String[] columnNames = {"Product", "Availability"};
private Object[][] data = {columnNames, columnNames, columnNames};
private DefaultTableModel model;
private JTable table;
private Executor executor = Executors.newCachedThreadPool();
private Timer timer;
public TableWithExecutor() {
model = new DefaultTableModel(data, columnNames);
table = new JTable(model) {
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
table.setDefaultRenderer(Date.class, new DefaultTableCellRenderer() {
@Override
protected void setValue(Object value) {
setText((value == null) ? "" : df.format(value));
}
});
table.setPreferredScrollableViewportSize(new Dimension(200, 100));
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane, BorderLayout.CENTER);
timer = new Timer(delay, startCycle());
timer.setRepeats(true);
timer.start();
}
private Action startCycle() {
return new AbstractAction(MyTask.STARTSCHEDULE) {
@Override
public void actionPerformed(ActionEvent e) {
executor.execute(new MyTask(MyTask.STARTSCHEDULE));
}
};
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
TableWithExecutor frame = new TableWithExecutor();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
private class MyTask extends SwingWorker<List<DateRecord>, DateRecord> {
private static final String STARTSCHEDULE = "StartSchedule";
private String name = STARTSCHEDULE;
MyTask(String name) {
this.name = name;
addPropertyChangeListener(new TaskListener(name));
}
@Override
protected List<DateRecord> doInBackground() throws Exception {
for (int row = 0; row < model.getRowCount(); row++) {
Date date = new Date();
date.setTime(date.getTime() + row * 1000);
publish(new DateRecord(row, date));
}
return null;
}
@Override
protected void process(List<DateRecord> chunks) {
for (DateRecord dr : chunks) {
model.setValueAt(dr.date, dr.rowNumber, 1);
}
}
@Override
protected void done() {
try {
get();
} catch (Exception e) {
e.printStackTrace(System.err);
}
}
}
private static class DateRecord {
private int rowNumber;
private Date date;
public DateRecord(int recordNumber, Date date) {
this.rowNumber = recordNumber;
this.date = date;
}
}
private static class TaskListener implements PropertyChangeListener {
private String name;
TaskListener(String name) {
this.name = name;
}
@Override
public void propertyChange(PropertyChangeEvent e) {
System.out.println(name + ": "
+ e.getOldValue() + " -> " + e.getNewValue());
}
}
}