hi,
i have a problem while reloading the applet with SwingWorker. it works fine in first time, if i reload with the same browser means the Applet window is opened but if i clicking the Download Button means it shows an Exception like "illegalThreadStateException" and it wont perform the copying files.
i have included my code :
Code:
jsp code:
<html>
<body>
<%
String projid="P0001396";
%>
<jsp:plugin archive="archivedownload.jar" type="applet" code="archiveapplet.class" codebase="/archivedownload">
<jsp:params>
<jsp:param name="projid" value="<%=projid%>"/>
</jsp:params>
<jsp:fallback>
<p> unable to load Plugin </p>
</jsp:fallback>
</jsp:plugin>
</body>
</html>
this is my applet code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;
import java.io.*;
public class archiveapplet extends Applet
{
public boolean status=false;
archivedownload arch;
public void init()
{
setBackground(Color.red);
}
public void start()
{
if (arch==null) {
arch = new archivedownload("");
} else {
arch.setVisible(true);
}
status=true;
}
public void stop()
{
System.out.println("stop()");
status=false;
arch.setVisible(false);
try
{
Thread.sleep(1);
}
catch (Exception ee)
{
System.out.println("The Exception is ====>"+ee);
}
}
public void destroy(){
System.out.println("destroy()");
arch = null;
System.gc();
}
public static void main(String[] args)
{
JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
try
{
UIManager.setLookAndFeel(
"com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}
catch (Exception ex)
{
System.out.println("Failed loading L&F: ");
System.out.println(ex);
}
new archivedownload("");
}
}
class archivedownload extends JFrame
{
private JButton Exit;
private JButton download;
File f1;
File f2;
public archivedownload(String val)
{
super();
initializeComponent();
this.setVisible(true);
}
private void initializeComponent()
{
Exit = new JButton();
download = new JButton();
JPanel contentPane = (JPanel)this.getContentPane();
Exit.setText("Exit");
Exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
Exit_actionPerformed(e);
}
});
download.setText("Download");
download.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
download_actionPerformed(e);
}
});
contentPane.setLayout(null);
addComponent(contentPane, Exit, 169,92,83,28);
addComponent(contentPane, download, 48,92,83,28);
this.setTitle("archivedownload - extends JFrame");
this.setLocation(new Point(0, 0));
this.setSize(new Dimension(420, 227));
}
private void addComponent(
Container container,
Component c,
int x,
int y,
int width,
int height)
{
c.setBounds(x,y,width,height);
container.add(c);
}
private void Exit_actionPerformed(ActionEvent e)
{
this.dispose();
}
private void download_actionPerformed(ActionEvent e)
{
try
{
System.out.println("inside Folder copy");
f1 = new File("c"+":/"+"fms/");
f2= new File("d"+":/"+"fms/");
SwingWorker sw = new SwingWorker() {
protected Object doInBackground() throws Exception {
copyDirectory(f1,f2); // this is for copy files from C: fms(folder) to D: (fms)
System.out.println("Folder Copied ");
return null;
}};
sw.execute();
if(sw.isDone()){
sw = null;
}
}
catch (Exception ee)
{
System.out.println("The Exception is -->"+ee);
}
}
public void copyDirectory(File srcDir, File dstDir) throws IOException {
if (srcDir.isDirectory()) {
if (!dstDir.exists()) {
dstDir.mkdir();
}
String[] children = srcDir.list();
for (int i=0; i<children.length; i++) {
copyDirectory(new File(srcDir, children[i]),new File(dstDir, children[i]));
}
} else {
InputStream in = new FileInputStream(srcDir);
OutputStream out = new FileOutputStream(dstDir);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
}
}
}
AccumulativeRunnable.java
import java.util.*;
import java.lang.reflect.Array;
import javax.swing.SwingUtilities;
abstract class AccumulativeRunnable<T> implements Runnable {
private List<T> arguments = null;
private Class<?> componentType = null;
protected abstract void run(T... args);
public final void run() {
run(flush());
}
public final synchronized void add(T... args) {
if (componentType == null) {
componentType = (Class<T>) args.getClass().getComponentType();
}
boolean isSubmitted = true;
if (arguments == null) {
isSubmitted = false;
arguments = new ArrayList<T>();
}
Collections.addAll(arguments, args);
if (!isSubmitted) {
submit();
}
}
protected void submit() {
SwingUtilities.invokeLater(this);
}
private final synchronized T[] flush() {
List<T> list = arguments;
arguments = null;
if (componentType == null) {
componentType = Object.class;
}
T[] args = (T[]) Array.newInstance(componentType,
list.size());
list.toArray(args);
return args;
}
}
SwingPropertyChangeSupport.java
import java.beans.PropertyChangeSupport;
import java.beans.PropertyChangeEvent;
import javax.swing.SwingUtilities;
import java.beans.*;
public final class SwingPropertyChangeSupport extends PropertyChangeSupport {
public SwingPropertyChangeSupport(Object sourceBean) {
this(sourceBean, false);
}
public SwingPropertyChangeSupport(Object sourceBean, boolean notifyOnEDT) {
super(sourceBean);
this.notifyOnEDT = notifyOnEDT;
}
public void firePropertyChange(final PropertyChangeEvent evt) {
if (evt == null) {
throw new NullPointerException();
}
if (! isNotifyOnEDT()
|| SwingUtilities.isEventDispatchThread()) {
super.firePropertyChange(evt);
} else {
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
firePropertyChange(evt);
}
});
}
}
public final boolean isNotifyOnEDT() {
return notifyOnEDT;
}
static final long serialVersionUID = 7162625831330845068L;
private final boolean notifyOnEDT;
}
SwingWorker.java
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.concurrent.*;
import java.util.concurrent.locks.*;
import javax.swing.SwingUtilities;
import java.beans.*;
public abstract class SwingWorker<T, V> implements Runnable, Future<T> {
private static final int MAX_WORKER_THREADS = 10;
private volatile int progress;
private volatile StateValue state;
private final FutureTask<T> future;
private final SwingPropertyChangeSupport propertyChangeSupport;
private AccumulativeRunnable<V> doProcess;
private AccumulativeRunnable<Integer> doNotifyProgressChange;
private static ExecutorService executorService = null;
public enum StateValue {PENDING,STARTED,DONE };
public SwingWorker() {
Callable<T> callable =
new Callable<T>() {
public T call() throws Exception {
setState(StateValue.STARTED);
return doInBackground();
}
};
future = new FutureTask<T>(callable) {
@Override
protected void done() {
doneEDT();
setState(StateValue.DONE);
}
};
state = StateValue.PENDING;
propertyChangeSupport = new SwingPropertyChangeSupport(this, true);
doProcess = null;
doNotifyProgressChange = null;
}
protected abstract T doInBackground() throws Exception ;
public final void run() {
future.run();
}
protected final void publish(V... chunks) {
synchronized (this) {
if (doProcess == null) {
doProcess = new AccumulativeRunnable<V>() {
@Override
public void run(V... args) {
process(args);
}
};
}
}
doProcess.add(chunks);
}
protected void process(V... chunks) {
}
protected void done() {
}
protected final void setProgress(int progress) {
if (progress < 0 || progress > 100) {
throw new IllegalArgumentException("the value should be from 0 to 100");
}
int oldProgress = this.progress;
this.progress = progress;
synchronized (this) {
if (doNotifyProgressChange == null) {
doNotifyProgressChange =
new AccumulativeRunnable<Integer>() {
@Override
public void run(Integer... args) {
firePropertyChange("progress",
args[0],
args[args.length - 1]);
}
};
}
}
doNotifyProgressChange.add(oldProgress, progress);
}
public final int getProgress() {
return progress;
}
public final void execute() {
getWorkersExecutorService().execute(this);
}
public final boolean cancel(boolean mayInterruptIfRunning) {
return future.cancel(mayInterruptIfRunning);
}
public final boolean isCancelled() {
return future.isCancelled();
}
public final boolean isDone() {
return future.isDone();
}
public final T get() throws InterruptedException, ExecutionException {
return future.get();
}
public final T get(long timeout, TimeUnit unit) throws InterruptedException,
ExecutionException, TimeoutException {
return future.get(timeout, unit);
}
public final void addPropertyChangeListener(PropertyChangeListener listener) {
getPropertyChangeSupport().addPropertyChangeListener(listener);
}
public final void removePropertyChangeListener(PropertyChangeListener listener) {
getPropertyChangeSupport().removePropertyChangeListener(listener);
}
public final void firePropertyChange(String propertyName, Object oldValue,
Object newValue) {
getPropertyChangeSupport().firePropertyChange(propertyName,
oldValue, newValue);
}
public final PropertyChangeSupport getPropertyChangeSupport() {
return propertyChangeSupport;
}
// PropertyChangeSupports methods END
/**
* Returns the {@code SwingWorker} state bound property.
*
* @return the current state
*/
public final StateValue getState() {
/*
* DONE is a special case
* to keep getState and isDone is sync
*/
if (isDone()) {
return StateValue.DONE;
} else {
return state;
}
}
private void setState(StateValue state) {
StateValue old = this.state;
this.state = state;
firePropertyChange("state", old, state);
}
private void doneEDT() {
Runnable doDone =
new Runnable() {
public void run() {
done();
}
};
if (SwingUtilities.isEventDispatchThread()) {
doDone.run();
} else {
SwingUtilities.invokeLater(doDone);
}
}
private static synchronized ExecutorService getWorkersExecutorService() {
if (executorService == null) {
//this creates non-daemon threads.
ThreadFactory threadFactory =
new ThreadFactory() {
final ThreadFactory defaultFactory =
Executors.defaultThreadFactory();
public Thread newThread(final Runnable r) {
Thread thread =
defaultFactory.newThread(r);
thread.setName("SwingWorker-"
+ thread.getName());
return thread;
}
};
executorService = new ThreadPoolExecutor(0, MAX_WORKER_THREADS,
1L, TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(),
threadFactory) {
private final ReentrantLock pauseLock = new ReentrantLock();
private final Condition unpaused = pauseLock.newCondition();
private boolean isPaused = false;
private final ReentrantLock executeLock = new ReentrantLock();
@Override
public void execute(Runnable command) {
executeLock.lock();
try {
pauseLock.lock();
try {
isPaused = true;
} finally {
pauseLock.unlock();
}
setCorePoolSize(MAX_WORKER_THREADS);
super.execute(command);
setCorePoolSize(0);
pauseLock.lock();
try {
isPaused = false;
unpaused.signalAll();
} finally {
pauseLock.unlock();
}
} finally {
executeLock.unlock();
}
}
@Override
protected void afterExecute(Runnable r, Throwable t) {
super.afterExecute(r, t);
pauseLock.lock();
try {
while(isPaused) {
unpaused.await();
}
} catch(InterruptedException ignore) {
} finally {
pauseLock.unlock();
}
}
};
}
return executorService;
}
}
can any one pls solve this problem. thanks in advance.
IllegalThreadStateException in applet using SwingWorker? -
09-11-2008, 02:03 AM
I am having the same problem -
09-26-2008, 08:48 AM
Linear Mode
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