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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » Why do "PreferenceNode" trigger the exception ?
Why do "PreferenceNode" trigger the exception ? [message #453817] Mon, 11 April 2005 08:18
jp is currently offline jpFriend
Messages: 1
Registered: July 2009
Junior Member
Hi.

With "JFace", the following source works well :

<code_start>
public class MainFrame {
public static void main(String[] args) {
Display display = new Display();
PreferenceManager mgr = new PreferenceManager();

// fragment #1
PreferenceNode one = new PreferenceNode("one", new PageOne());
//

mgr.addToRoot(one);
PreferenceDialog dlg = new PreferenceDialog(null, mgr);
dlg.open();
display.dispose();
}
}
class PageOne extends PreferencePage {
protected Control createContents(Composite parent) {
Composite composite = new Composite(parent, SWT.NONE);
return composite;
}
}
</code_start>


But, the "NullPointerException" occurs if the fragment #1 above
is replaced with the following one :

///////
PreferenceNode one = new PreferenceNode("one", "One",
null,
PageOne.class.getName());
///////

What wrong ?
Thanks.
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