Cómo generar excepciones desde RepaintManager
En relación con mi pregunta ( puede ser ), encontré otro tipo de excepción que no pude detectar e imprimir desde SwingWorkerel hilo.
¿ Cómo puedo generar RepaintManagerexcepciones?
Leí esto CheckThreadViolationRepaintManagery este enfoque de Alexander Potochkin, pero nada parece resolver mis problemas.
Aceptado
Si ayuda, el siguiente ejemplo imprime múltiples variaciones de lo siguiente Exception, principalmente para cada fase de la inicialización del delegado de UI del marco. Usé CheckThreadViolationRepaintManager, pero la variación también parece interesante.AspectJ
java.lang.Excepción
en EDTViolation$CheckThreadViolationRepaintManager.checkThreadViolations(EDTViolation.java:43)
en EDTViolation$CheckThreadViolationRepaintManager.addDirtyRegion(EDTViolation.java:37)
en javax.swing.JComponent.repaint(JComponent.java:4734)
en java.awt.Component.repaint(Component.java:3168)
en javax.swing.JComponent.setFont(JComponent.java:2727)
en javax.swing.LookAndFeel.installColorsAndFont(LookAndFeel.java:191)
en javax.swing.plaf.basic.BasicPanelUI.installDefaults(BasicPanelUI.java:49)
en javax.swing.plaf.basic.BasicPanelUI.installUI(BasicPanelUI.java:39)
en javax.swing.JComponent.setUI(JComponent.java:662)
en javax.swing.JPanel.setUI(JPanel.java:136)
en javax.swing.JPanel.updateUI(JPanel.java:109)
en javax.swing.JPanel.(JPanel.java:69)
en javax.swing.JPanel.(JPanel.java:92)
en javax.swing.JPanel.(JPanel.java:100)
en javax.swing.JRootPane.createGlassPane(JRootPane.java:528)
en javax.swing.JRootPane.(JRootPane.java:348)
en javax.swing.JFrame.createRootPane(JFrame.java:255)
en javax.swing.JFrame.frameInit(JFrame.java:236)
en javax.swing.JFrame.(JFrame.java:159)
en EDTViolation.main (EDTViolation.java:12)
...
import java.lang.ref.WeakReference;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.RepaintManager;
import javax.swing.SwingUtilities;
/** @see https://stackoverflow.com/questions/7787998 */
public class EDTViolation {
public static void main(String args[]) {
RepaintManager.setCurrentManager(new CheckThreadViolationRepaintManager());
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setVisible(true);
}
private static class CheckThreadViolationRepaintManager extends RepaintManager {
//http://weblogs.java.net/blog/alexfromsun/archive/2006/02/debugging_swing.html
private boolean completeCheck = true;
private WeakReference<JComponent> lastComponent;
public CheckThreadViolationRepaintManager(boolean completeCheck) {
this.completeCheck = completeCheck;
}
public CheckThreadViolationRepaintManager() {
this(true);
}
public boolean isCompleteCheck() {
return completeCheck;
}
public void setCompleteCheck(boolean completeCheck) {
this.completeCheck = completeCheck;
}
@Override
public synchronized void addInvalidComponent(JComponent component) {
checkThreadViolations(component);
super.addInvalidComponent(component);
}
@Override
public void addDirtyRegion(JComponent component, int x, int y, int w, int h) {
checkThreadViolations(component);
super.addDirtyRegion(component, x, y, w, h);
}
private void checkThreadViolations(JComponent c) {
if (!SwingUtilities.isEventDispatchThread() && (completeCheck || c.isShowing())) {
boolean repaint = false;
boolean fromSwing = false;
boolean imageUpdate = false;
StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
for (StackTraceElement st : stackTrace) {
if (repaint && st.getClassName().startsWith("javax.swing.")
&& // for details see
// https://swinghelper.dev.java.net/issues/show_bug.cgi?id=1
!st.getClassName().startsWith("javax.swing.SwingWorker")) {
fromSwing = true;
}
if (repaint && "imageUpdate".equals(st.getMethodName())) {
imageUpdate = true;
}
if ("repaint".equals(st.getMethodName())) {
repaint = true;
fromSwing = false;
}
if ("read".equals(st.getMethodName()) && "javax.swing.JEditorPane".equals(st.getClassName())) {
// Swing reads html from a background thread
return;
}
}
if (imageUpdate) {
//assuming it is java.awt.image.ImageObserver.imageUpdate(...)
//image was asynchronously updated, that's ok
return;
}
if (repaint && !fromSwing) {
//no problems here, since repaint() is thread safe
return;
}
//ignore the last processed component
if (lastComponent != null && c == lastComponent.get()) {
return;
}
lastComponent = new WeakReference<JComponent>(c);
violationFound(c, stackTrace);
}
}
protected void violationFound(JComponent c, StackTraceElement[] stackTrace) {
System.out.println();
System.out.println("EDT violation detected");
System.out.println(c);
for (StackTraceElement st : stackTrace) {
System.out.println("\tat " + st);
}
}
}
}
Crea tu propia excepción
class RepaintManagerException extends Exception
{
String msg;
RepaintManagerException()
{
msg = new String("type message here");
}
}
Uso
public class My_Exception
{
public static void main (String args [ ])
{
try
{
// your code
if (expression) throw new RepaintManagerException( );
}
catch (RepaintManagerException e)
{
System.out.println (e);
}
}
}
