code: public ExtjsConditionManager addFailConditions(String... messages) {
          for (String message : messages) {
              if (message != null && message.length() > 0) {
                  this.add(new MessageBoxFailCondition(message));
              }
          }
          return this;
      }
docs: add each message to MessageBoxFailCondition
  
  @param messages messages
  @return this