private void endClassName() {
    StringBuilder str = (StringBuilder) stack.pop();
    stack.push(str.toString().trim()); // trim fixes bug 32928
  }
finish parsing a "group" element which is just a string

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/CacheXmlParser.java