Spring-Data-Jpa存储库-实体列名下划线

Question

我在一个spring webmvc项目上使用spring-data-jpa。我在使用我的一个实体的存储库创建查询时遇到了一个问题。下面您可以看到我的实体、我的存储库和异常。

我的实体：

@Entity
@Table(schema = "mainschema")
@XmlRootElement
public class Municipalperson implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(nullable = false)
    private Integer id;

    @Basic(optional = false)
    @Column(name = "municipal_id", nullable = false)
    private Integer municipal_id;

    @Basic(optional = false)
    @Column(nullable = false, length = 60)
    private String firstname;

    public Municipalperson(Integer id, Integer municipal_id, String firstname) {
        this.id = id;
        this.municipal_id = municipal_id;
        this.firstname = firstname;
    }


    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getMunicipal_id() {
        return municipal_id;
    }

    public void setMunicipal_id(Integer municipal_id) {
        this.municipal_id = municipal_id;
    }

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }
}

我的存储库：

@Repository
public interface MunicipalpersonRepository extends JpaRepository<Municipalperson, Integer> {

    List<Municipalperson> findByMunicipal_idOrderByLastnameDesc(int municipal_id);
}

而例外，

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'municipalpersonRepository': Invocation of init method failed; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property municipal found for type Municipalperson!  

最后，我将missional_id重命名为missionalid（删除下划线），并重命名getters/setters和存储库(findbymissionalidorderbylastnamedesc)，问题得到解决。

我的问题是为什么会发生这种情况？

Answer 1

我通过将字段重命名为不带下划线的名称来解决此错误。

@Column(name = "municipal_id", nullable = false)
private Integer municipalId; // <-- field was renamed