Bug 191880 Close the invalid library will lead the ClassCastException occurs and that error will lead some operation throw exceptions
Description: Close the invalid library will lead the ClassCastException occurs and that error will lead some operation such as insert a Create a datasource throw exceptions Build number: 2.2.0.v20070608-0630 Steps to reproduce: 1, Open the attache library file 2, Close that file 3, New a Data source in another report design file Expected result: After step2, the library is closed without exceptions After step3, the parameter can be created successfully without exceptions Actual result: After step2, ClassCastException occurs After step3, NPE throws out Error log: java.lang.ClassCastException: org.eclipse.gef.commands.CommandStack at org.eclipse.birt.report.designer.ui.editors.LibraryLayoutEditorFormPage.dispose(LibraryLayoutEditorFormPage.java:249) at org.eclipse.birt.report.designer.ui.editors.MultiPageReportEditor.dispose(MultiPageReportEditor.java:1010) at org.eclipse.birt.report.designer.ui.editors.IDEMultiPageReportEditor.dispose(IDEMultiPageReportEditor.java:432) at org.eclipse.birt.report.designer.ui.editors.ReportEditorProxy.dispose(ReportEditorProxy.java:133) NPE: java.lang.NullPointerException at org.eclipse.birt.report.designer.ui.editor.pages.xml.ReportXMLSourceEditorFormPage.reloadEditorInput(ReportXMLSourceEditorFormPage.java:514) at org.eclipse.birt.report.designer.ui.editor.pages.xml.ReportXMLSourceEditorFormPage.access$1(ReportXMLSourceEditorFormPage.java:509) at org.eclipse.birt.report.designer.ui.editor.pages.xml.ReportXMLSourceEditorFormPage$1.stackChanged(ReportXMLSourceEditorFormPage.java:408)
UI/org.eclipse.birt.report.designer.ui.lib/src/org/eclipse/birt/report/designer/ui/editors/LibraryLayoutEditorFormPage.java
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.forms.IManagedForm;
import org.eclipse.ui.forms.editor.FormEditor;
import org.eclipse.ui.part.MultiPageEditorSite;
/**
 * 
 */
public class LibraryLayoutEditorFormPage extends LibraryLayoutEditor implements
		IReportEditorPage
{
	public static final String ID = "org.eclipse.birt.report.designer.ui.editors.library.layout"; 
	private int index;
	private FormEditor editor;
	private Control control;
	private int staleType;
	private ActivityStackListener commandStackListener = new ActivityStackListener( ) {
		public void stackChanged( ActivityStackEvent event )
		{
			updateStackActions( );
			getEditor( ).editorDirtyStateChanged( );
			staleType = IPageStaleType.MODEL_CHANGED;
		}
	};
	private boolean hasWarning;
	protected void configureGraphicalViewer( )
	{
		super.configureGraphicalViewer( );
		WrapperCommandStack stack = (WrapperCommandStack) getCommandStack( );
		if ( stack != null )
		{