JPA Criteria API并使用包含.in（）]的WHERE谓词进行查询。

Question

我想在我的谓词是这样的地方进行一些查询：

CriteriaBuilder criteriaBuilder = getEntityManager().getCriteriaBuilder();
    CriteriaQuery<ProviderService> criteriaQuery = criteriaBuilder.createQuery(ProviderService.class);
    // FROM
    Root<ProviderService> providerService = criteriaQuery.from(ProviderService.class);
    // SELECT
    criteriaQuery.select(providerService);

// WHERE'S PREDICATE
    List<Predicate> predicates = new ArrayList<>();

    if(providers != null && providers.size() > 0) {

        predicates.add(providerService.get(ProviderService_.provider).in(providers));
    } 
criteriaQuery.where(predicates.toArray(new Predicate[] { }));

    TypedQuery<ProviderService> query = getEntityManager().createQuery(criteriaQuery);

    return query.getResultList();

我检查搜索任何提供者的提供者表单集合（列表）提供的提供者提供（ProviderService）。 

我收到了类似这样的异常：

Caused by: java.lang.IllegalArgumentException: Unaware how to convert value [pl.salonea.entities.Provider@85eab3b6 : pl.salonea.entities.Provider] to requested type [java.lang.Long]
at org.hibernate.jpa.criteria.ValueHandlerFactory.unknownConversion(ValueHandlerFactory.java:258)
at org.hibernate.jpa.criteria.ValueHandlerFactory.access$000(ValueHandlerFactory.java:34)
at org.hibernate.jpa.criteria.ValueHandlerFactory$LongValueHandler.convert(ValueHandlerFactory.java:152)
at org.hibernate.jpa.criteria.ValueHandlerFactory$LongValueHandler.convert(ValueHandlerFactory.java:139)
at org.hibernate.jpa.criteria.predicate.InPredicate.<init>(InPredicate.java:130)
at org.hibernate.jpa.criteria.predicate.InPredicate.<init>(InPredicate.java:108)
at org.hibernate.jpa.criteria.CriteriaBuilderImpl.in(CriteriaBuilderImpl.java:529)
at org.hibernate.jpa.criteria.expression.ExpressionImpl.in(ExpressionImpl.java:79)

编辑：

我认为它可能与由（Provider，Service）组成并定义如下的ProviderService复合ID有关：

@Id
@NotNull
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "provider_id", referencedColumnName = "provider_id", nullable = false, columnDefinition = "BIGINT UNSIGNED")
public Provider getProvider() {
    return provider;
}

public void setProvider(Provider provider) {
    this.provider = provider;
}

@Id
@NotNull
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "service_id", referencedColumnName = "service_id", nullable = false, columnDefinition = "INT UNSIGNED")
public Service getService() {
    return service;
}

public void setService(Service service) {
    this.service = service;
}

并具有适当的IdClass如下：

public class ProviderServiceId implements Serializable {

private Long provider;
private Integer service;

/* constructors */

public ProviderServiceId() { }

public ProviderServiceId(Long providerId, Integer serviceId) {
    this.provider = providerId;
    this.service = serviceId;
}
// etc.

或也许没有这样的可能性将实体属性与该属性的可能值列表（实体列表）进行比较

我想在我的谓词像这样的地方进行一些查询：CriteriaBuildercriteriaBuilder = getEntityManager（）。getCriteriaBuilder（）; CriteriaQuery

条件查询= ...

Answer 1

建议加入似乎正常工作：