Bug 30630 nested source folders: unclear error message
20030129 create a jproject, a source folder s1 and a nested in it source folder s2 delete s1 open the 'new' wizard and try creating a source folder s1 the error message is very long and compilicated while it should be a simple warning saying 'You have a folder s1 - I will turn it into a source folder fo you' (and then it could automagically add excelusion filter so that s2 is still a source folder)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceContainerWorkbookPage.java
String[] buttonLabels;
		buttonLabels= new String[] { 
			 NewWizardMessages.getString("SourceContainerWorkbookPage.folders.add.button"), 
			 null,
			 NewWizardMessages.getString("SourceContainerWorkbookPage.folders.edit.button"), 
			 NewWizardMessages.getString("SourceContainerWorkbookPage.folders.remove.button") 
		};
		
		fFoldersList= new TreeListDialogField(adapter, buttonLabels, new CPListLabelProvider());
		fFoldersList.setDialogFieldListener(adapter);
		fFoldersList.setLabelText(NewWizardMessages.getString("SourceContainerWorkbookPage.folders.label")); 
		
		fFoldersList.setViewerSorter(new CPListElementSorter());
		fFoldersList.enableButton(IDX_EDIT, false);
		
		fUseFolderOutputs= new SelectionButtonDialogField(SWT.CHECK);
		fUseFolderOutputs.setSelection(false);
		fUseFolderOutputs.setLabelText(NewWizardMessages.getString("SourceContainerWorkbookPage.folders.check")); 
		fUseFolderOutputs.setDialogFieldListener(adapter);
	}
	
	public void init(IJavaProject jproject) {
		fCurrJProject= jproject;
		fProjPath= fCurrJProject.getProject().getFullPath();	
		updateFoldersList();
	}
	
	private void updateFoldersList() {	
		ArrayList folders= new ArrayList();