code: public UnprocessableEntityException withValidationErrors(ValidationError... validationErrors) {
          if (this.validationErrors == null) {
              setValidationErrors(new java.util.ArrayList<ValidationError>(validationErrors.length));
          }
          for (ValidationError ele : validationErrors) {
              this.validationErrors.add(ele);
          }
          return this;
      }
docs: A collection of validation error responses.
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setValidationErrors(java.util.Collection)} or {@link #withValidationErrors(java.util.Collection)} if you
  want to override the existing values.
  </p>
  
  @param validationErrors
  A collection of validation error responses.
  @return Returns a reference to this object so that method calls can be chained together.