Thread: Pressing Cancel in FileDialog close entire application (Using SWT)

HI,

when I open a file dialog from my application and press the cancel button located within the file dialog, it just closes the file dialog as expected, if I repeat the process, it closes the entire application, that would be my main shell which has my menubar, as well as a number of other things and the application window which holds the button the activates the file dialog.

this is the error log that it gives

ImportWindow is the application window
AppMainShell is the class the creates the main Shell
I can include code, but wasnt sure what to put here.

I have included an image to give the basic idea of what it looks like

pic.jpg

#
java.lang.NullPointerException
at app.GUIConstructionModule.ImportWindow$4.widgetSelected(ImportWindow.java:324)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at app.GUIConstructionModule.ImportWindow.openWindow(ImportWindow.java:74)
at app.GUIConstructionModule.ImportWindow.<init>(ImportWindow.java:41)
at app.GUIConstructionModule.AppMenu$2.widgetSelected(AppMenu.java:181)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at app.GUIConstructionModule.AppMainShell.setupWindow(AppMainShell.java:30)
at app.GUIConstructionModule.AppMainShell.<init>(AppMainShell.java:16)
at app.ConstructApp.<init>(ConstructApp.java:24)
at app.ConstructApp.main(ConstructApp.java:36)
java.lang.NullPointerException
at app.GUIConstructionModule.ImportWindow$6.widgetSelected(ImportWindow.java:352)
at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at app.GUIConstructionModule.AppMainShell.setupWindow(AppMainShell.java:30)
at app.GUIConstructionModule.AppMainShell.<init>(AppMainShell.java:16)
at app.ConstructApp.<init>(ConstructApp.java:24)
at app.ConstructApp.main(ConstructApp.java:36)




I appreciate any help

Cool thanks you nailed it, so obvious in retrospect, I appreciate your input, this is the segment that was crashing the application

mainfileButton.addSelectionListener(new SelectionAdapter() {
 
				 public void widgetSelected(SelectionEvent e) {
 
 
					 main = new FileDialog(shell, SWT.OPEN);
					 String path = main.open();
 
 
					 /*
					 if(!path.isEmpty()){
 
						 mainfilePathHolder.setText (path);
 
					 }
					 */
				 }
			});

when my if statement gets validated, if cancel is pushed, path is null.
The weird thing remains,for some reason, it would only crash after repeating the error on the second time, but yes Im going to chuck in a try, catch statement to solve it.

Thank you very much!

Cool, changed it to an if statement, works great, thank you