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Invalid Thread Access?
I have a Composite shell that has a button set-up to open the file dialog within windows but whenever I put the commands into the selection listener I get an invalid thread access error when I try to open that view.
Code:
//file path
new Label(banner, SWT.NONE).setText("Build File: ");
fdText = new Text(banner, SWT.BORDER);
Button open = new Button(banner, SWT.PUSH);
open.setText("Open");
gridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
open.setLayoutData(gridData);
shell = new Shell(new Display());
shell.setSize(400, 400);
open.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event){
FileDialog fd = new FileDialog(shell, SWT.OPEN);
fd.setText("Open");
fd.setFilterPath("C:/");
String selected = fd.open();
System.out.println(selected);
}
});
if I remove the contents of widgetSelected() it will load the view but the button does nothing when its pressed. I was looking around and it seems I need to synchronize the FileDialog to the Windows action timer so that multiple commands don't try to run at the same time or something but I can't figure out how. The simplest example I've seen is
Code:
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;
public class MainClass {
public static void main(String[] a) {
Shell s = new Shell();
FileDialog fd = new FileDialog(s, SWT.OPEN);
fd.setText("Open");
fd.setFilterPath("C:/");
String[] filterExt = {"*.txt","*.doc", ".rtf", "*.*"};
fd.setFilterExtensions(filterExt);
String selected = fd.open();
System.out.println(selected);
}
}
The only thing I can think is that I need place code thats in widgetSelected to open from Main but I don't seem to have a main method.(Running Eclipse Ganyemede). Anyone know how to fix this so I can have a button within view activate the FileDialog in a new shell?
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I looked up Threads a little and added this to my code. It now runs the view instead of just displaying an error message. If I click on the open button nothing happens until I close the application and then an error message appears.
Code:
//file path
new Label(banner, SWT.NONE).setText("Build File: ");
fdText = new Text(banner, SWT.BORDER);
Button open = new Button(banner, SWT.PUSH);
open.setText("Open");
gridData = new GridData(GridData.HORIZONTAL_ALIGN_END);
open.setLayoutData(gridData);
open.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event){
System.out.println("Testing before open");
new Thread(new Runnable() {
public void run() {
while (true) {
try { Thread.sleep(1000); } catch (Exception e) { }
Display.getDefault().asyncExec(new Runnable() {
public void run() {
Display d = new Display();
Shell s = new Shell(d);
System.out.println("Testing Thread");
FileDialog fd = new FileDialog(s, SWT.OPEN);
fd.setText("Open");
String selected = fd.open();
System.out.println(selected);
}
});
}
}
}).start();
System.out.println("Testing after open");
}
});
This is the error
Code:
!ENTRY org.eclipse.ui 4 0 2008-10-30 15:43:23.924
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.swt.SWTException: Invalid thread access
at org.eclipse.swt.SWT.error(SWT.java:3777)
at org.eclipse.swt.SWT.error(SWT.java:3695)
at org.eclipse.swt.SWT.error(SWT.java:3666)
at org.eclipse.swt.widgets.Display.checkDisplay(Display.java:714)
at org.eclipse.swt.widgets.Display.create(Display.java:776)
at org.eclipse.swt.graphics.Device.<init>(Device.java:135)
at org.eclipse.swt.widgets.Display.<init>(Display.java:447)
at org.eclipse.swt.widgets.Display.<init>(Display.java:438)
at views.NewBuildView$1.widgetSelected(NewBuildView.java:84)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at novlayout.Application.start(Application.java:20)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:386)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
at org.eclipse.equinox.launcher.Main.main(Main.java:1212)
The console output right now is just Testing before open Testing after open.
