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
List res= new ArrayList();
		List cplist= fLibrariesList.getElements();
		for (int i= 0; i < cplist.size(); i++) {
			CPListElement elem= (CPListElement)cplist.get(i);
			if (elem.getEntryKind() == IClasspathEntry.CPE_LIBRARY && (elem != existing)) {
				IResource resource= elem.getResource();
				if (resource instanceof IFile) {
					res.add(resource.getFullPath());
				}
			}
		}
		return (IPath[]) res.toArray(new IPath[res.size()]);
	}	
	
	private CPListElement newCPLibraryElement(IResource res) {
		return new CPListElement(fCurrJProject, IClasspathEntry.CPE_LIBRARY, res.getFullPath(), res);
	}
	private CPListElement[] openExtJarFileDialog(CPListElement existing) {
		if (existing == null) {
			IPath[] selected= BuildPathDialogAccess.chooseExternalJAREntries(getShell());
			if (selected != null) {
				ArrayList res= new ArrayList();
				for (int i= 0; i < selected.length; i++) {
					res.add(new CPListElement(fCurrJProject, IClasspathEntry.CPE_LIBRARY, selected[i], null));
				}
				return (CPListElement[]) res.toArray(new CPListElement[res.size()]);
			}
		} else {
			IPath configured= BuildPathDialogAccess.configureExternalJAREntry(getShell(), existing.getPath());
			if (configured != null) {