java - 自定义 Bean 验证的 Hibernate 错误

Question

我正在尝试创建自定义 bean 验证，因此我编写了此自定义约束:

@Documented
@Constraint(validatedBy = ValidPackageSizeValidator.class)
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ValidPackageSize {

  String message() default "{br.com.barracuda.constraints.ValidPackageSize}";
  Class<?>[] groups() default {};
  Class<? extends Payload>[] payload() default {};

}

还有一个 validator :

public class ValidPackageSizeValidator implements ConstraintValidator<ValidPackageSize, PackageSize> {

...

  @Override
  public boolean isValid(PackageSize value, ConstraintValidatorContext context) {
    ...validation login here..
  }

}

此外，我希望在调用一些装饰器后立即在服务层上执行验证，因此我创建了另一个装饰器来处理此任务..

@Decorator
public abstract class ConstraintsViolationHandlerDecorator<T extends AbstractBaseEntity> implements CrudService<T> {

  @Any
  @Inject
  @Delegate
  CrudService<T> delegate;

  @Inject
  Validator validator;

  @Override
  @Transactional
  public T save(T entity) {
      triggerValidations(entity);
      return delegate.save(entity);
  }

  private void triggerValidations(T entity) {
      List<String> errorMessages = validator.validate(entity).stream()
            .map(ConstraintViolation::getMessage)
            .collect(Collectors.toList());
      if (!errorMessages.isEmpty()) {
        throw new AppConstraintViolationException(errorMessages);
      }
  }
}

一切正常，但如果验证通过，hibernate 会抛出错误:

ERROR [default task-6] (AssertionFailure.java:50) - HHH000099: an assertion failure occurred (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): org.hibernate.AssertionFailure: null id in br.com.barracuda.model.entities.impl.PackageSize entry (don't flush the Session after an exception occurs)

我的实体使用自动生成的 id 值。

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
protected Long id;

将 Widlfly 9 与 JEE 7 结合使用。

Answer 1

验证被执行两次，一次在服务层(我希望它发生)，一次在实体被持久化/合并时(jpa 调用它)。所以我通过将此行添加到我的 persistence.xml 来禁用它:

<property name="javax.persistence.validation.mode" value="none"/>

现在一切正常