Java JPA嵌入式和BeanValidation

我需要在数据库中将类Poo保存为null，因此表中已经存在的任何属性都将转换为null。有可能吗

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我唯一能做的就是从属性中删除@NotNull，并将每个属性本身设置为null。

默认情况下，它的工作原理与您所说的完全相同。我刚刚用MariaDB测试了它，并且：

@Entity    
public class Foo {

    [...]

    @Valid
    @Embedded
    private Poo poo;
}

@Embeddable
public class Poo {

    @NotNull
    private Double value;

    @NotNull
    private Double value2;

    [...]
}

org.eclipse.persistence
.
也有同样的问题，我通过在注释@Valid下面添加一个类似@NotNull的注释来解决它

    ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
    Validator validator = factory.getValidator();

    Foo foo = new Foo(1, new Poo(1, 2));
    validate(validator, foo);
    entityManager.merge(foo);

    List<Foo> fooList = entityManager
        .createNamedQuery(Foo.FIND_ALL, Foo.class)
        .getResultList();
    assertTrue(fooList.get(0).getPoo().getValue1() == 1);

    foo.setPoo(null);
    validate(validator, foo);
    entityManager.merge(foo);

    fooList = entityManager
            .createNamedQuery(Foo.FIND_ALL, Foo.class)
            .getResultList();

    assertTrue(fooList.get(0).getPoo() == null);

有关如何指定EclipseLink应如何处理空值的信息，请参见。
    ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
    Validator validator = factory.getValidator();

    Foo foo = new Foo(1, new Poo(1, 2));
    validate(validator, foo);
    entityManager.merge(foo);

    List<Foo> fooList = entityManager
        .createNamedQuery(Foo.FIND_ALL, Foo.class)
        .getResultList();
    assertTrue(fooList.get(0).getPoo().getValue1() == 1);

    foo.setPoo(null);
    validate(validator, foo);
    entityManager.merge(foo);

    fooList = entityManager
            .createNamedQuery(Foo.FIND_ALL, Foo.class)
            .getResultList();

    assertTrue(fooList.get(0).getPoo() == null);

    @Entity    
public class Foo {

    [...]

    @Valid
    @Embedded
    @NotNull
    private Poo poo;
}

@Embeddable
public class Poo {

    @NotNull
    private Double value;

    @NotNull
    private Double value2;

    [...]
}