/** @param validationGroupsMetadata Validation group metadata. */
 public AbstractGwtValidator(ValidationGroupsMetadata validationGroupsMetadata) {
   validGroups = validationGroupsMetadata.getAllGroupsAndSequences();
   this.validationGroupsMetadata = validationGroupsMetadata;
 }
 /**
  * Creates a validator initialized with the default group inheritance map.
  *
  * @see #AbstractGwtValidator(ValidationGroupsMetadata)
  */
 public AbstractGwtValidator() {
   this(ValidationGroupsMetadata.builder().build());
 }