小编Can*_*SAL的帖子

我正在尝试使用Hibernate 5.0.7.Final的JPA2类型安全条件查询.

...
criteria.where( builder.equal( root.get(SingularAttribute.attr), value ));
//where parameters are
//criteria.where( builder.equal( root.get(Person_.name), "Can" ));
...

root.get总是抛出NullPointerException.元模型类Person_用于Person通过产生org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor.

在JPA/Hibernate Static Metamodel Attributes not Populated中提出了类似的问题- NullPointerException,但这次两个类都在同一个包中.

堆栈跟踪:

java.lang.NullPointerException
at org.hibernate.jpa.criteria.path.AbstractPathImpl.get(AbstractPathImpl.java:123)

我的代码:

我用来确保它们具有的接口getId();.

package it.unibz.db.hibernate.model;

public interface ModelInterface<PK extends Serializable> extends Serializable {
    PK getId();
}

模型类

package it.unibz.db.hibernate.model;

@Entity
@Table(name ="person")
public class Person implements ModelInterface<Integer> {
    @Id
    private Integer id;
    private String name;

    public Integer getId() …