private static PsiClass findControllerClass(PsiFile containingFile, Project project, XmlAttribute attribute) {
    final String attributeValue = attribute.getValue();
    if (!StringUtil.isEmptyOrSpaces(attributeValue)) {
      final GlobalSearchScope customScope = GlobalSearchScope.projectScope(project).intersectWith(containingFile.getResolveScope());
      return JavaPsiFacade.getInstance(project).findClass(attributeValue, customScope);
    }
    return null;
  }
private static PsiClass findControllerClass(PsiFile containingFile, Project project, XmlAttribute attribute)