在方法中使用@AssertTrue时,在验证期间调用该方法4次(Bean验证)

时间:2017-08-31 20:13:30

标签: java validation bean-validation hibernate-validator custom-validators

使用bean验证来验证对象的状态时,只要调用验证,就会调用带有@AssertTrue注释的方法4次。它应该只在每次调用时调用一次。

Hibernate-validator版本:5.1.3.Final

以下是一个例子:

对于以下类摩托车:

import javax.validation.constraints.AssertTrue;
class Motorcycle{
    private int fuel;
    private int tireDurability;

    @AssertTrue(message = "motorcycle.not.available.to.use")
    public boolean isAvailable(){
        return fuel > 0 && tireDurability > 0;
    }

    public void toUse(){...}
}

主要:

import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
public class Main{
    public static void main(String []args){
        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        Validator validator = factory.getValidator();

        Set<ConstraintViolation<Motorcycle>> violations = validator.validate(new Motorcycle());

    }
}

调用validator.validate(new Motorcycle())时,方法isAvailable()将被调用4次。

任何人都可以帮我解决这个问题吗?这是一个错误吗?我该如何解决这个问题?

1 个答案:

答案 0 :(得分:2)

您应该尝试使用Hibernate Validator 6.0.2.Final(它目前是最新的可用版本)。下一个测试确实通过了验证器的这个(最新)版本:

@Test
public void testMotorcycle() throws Exception {
    AtomicInteger count = new AtomicInteger( 0 );

    Motorcycle motorcycle = new Motorcycle( count );
    validator.validate( motorcycle );
    assertEquals( motorcycle.count.get(), 1 );
}

class Motorcycle {
    final AtomicInteger count;
    private int fuel;
    private int tireDurability;

    Motorcycle(AtomicInteger count) {
        this.count = count;
    }

    @AssertTrue(message = "motorcycle.not.available.to.use")
    public boolean isAvailable() {
        count.incrementAndGet();
        return fuel > 0 && tireDurability > 0;
    }

}

我确实尝试用5.1运行它 - 它也通过那里。您是如何确定该方法被调用4次的?