in src/main/java/org/apache/sling/hapi/impl/MicrodataAttributeHelperImpl.java [136:143]
public Map<String, String> get(Object key) {
Map<String, String> val = super.get(key);
if (null == val) {
LOG.debug("type = {}", type);
throw new HApiException("Property " + key + " does not exist for type " + type.getPath());
}
return val;
}