类“Hello”中未定义IdClass

Question

“我想从Hello类获取Hello world的goldUser的用户Id值，但无法获取该值。正在获取@IDClass”未为实体指定标识符：“错误”。“

我做错了什么，或者应该用什么方法从Hello表中获取用户id的值。

  @Entity
    @Table(name ="Greetings")
    class HelloWorld {

      @Id
      @IdClass(classOf[Hello])
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      @ManyToOne(fetch = FetchType.Lazy)
      @JoinColumn(name = "user_id")
      @BeanProperty
      var goldUser: Hello = _

      @Column(name = "morning")
      @BeanProperty
      var morning: Long = _

      @Column(name = "aftrnoon")
      @BeanProperty
      var afternoon: Long = _

    }"




    "@Entity
    @Table(name = "Hello")
    class Hello {
      @Id
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      @Column(name = "id")
      @BeanProperty
      var userId: Long = _
    }

"org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'goldEntityManager' defined in class path

Answer 1

您需要确保import该类：

import javax.persistence.IdClass;