Bug 82231 [build path] Hard to find type restriction compiler problem preferences
I20050104-1600 There compiler preference page contains a Warning/Error node with many sub-entries . I tried to find where I could change the 'warning' for the access of internal types to 'error'. No luck until I realized that the Build node also contains Warning/Error settings.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
public LibrariesWorkbookPage(IWorkspaceRoot root, ListDialogField classPathList) {
		fClassPathList= classPathList;
		fWorkspaceRoot= root;
		fSWTControl= null;
		
		String[] buttonLabels= new String[] { 
			NewWizardMessages.LibrariesWorkbookPage_libraries_addjar_button,	
			NewWizardMessages.LibrariesWorkbookPage_libraries_addextjar_button, 
			NewWizardMessages.LibrariesWorkbookPage_libraries_addvariable_button, 
			NewWizardMessages.LibrariesWorkbookPage_libraries_addlibrary_button, 
			NewWizardMessages.LibrariesWorkbookPage_libraries_addclassfolder_button, 
			 null,  
			NewWizardMessages.LibrariesWorkbookPage_libraries_edit_button, 
			NewWizardMessages.LibrariesWorkbookPage_libraries_remove_button
		};		
				
		LibrariesAdapter adapter= new LibrariesAdapter();
				
		fLibrariesList= new TreeListDialogField(adapter, buttonLabels, new CPListLabelProvider());
		fLibrariesList.setDialogFieldListener(adapter);
		fLibrariesList.setLabelText(NewWizardMessages.LibrariesWorkbookPage_libraries_label); 
		fLibrariesList.enableButton(IDX_REMOVE, false);
		fLibrariesList.enableButton(IDX_EDIT, false);
		
		fLibrariesList.setViewerSorter(new CPListElementSorter());
	}
		
	public void init(IJavaProject jproject) {