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java - 如何将实体对象绑定到本地 @Transient 属性？

问题描述

EmployeeInfo 实体类

@Entity
@Table(name = "employeeinfo")
public class EmployeeInfo{

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
@Column(name = "employeeId")
private String employeeId;
@Column(name = "firstName")
private String firstName;
@Column(name = "middleName")
private String middleName;
@Column(name = "lastName")
private String lastName;

......

}

另一个实体类 ProjectTaskComments

@Entity
@Table(name = "projecttaskcomments")
public class ProjectTaskComments{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Long id;
    @Basic(optional = false)
    @Column(name = "comments")
    private String comments;

    @Basic(optional = false)
    @Column(name = "commentTime")
    @Temporal(TemporalType.TIMESTAMP)
    private Date commentTime;
    @Column(name = "fkCommentedBy")
    private Long fkCommentedBy;


    @Transient
    @JsonIgnoreProperties
    private EmployeeInfo commentedEmployee;
    @Transient
    @Autowired
    EmployeeInfoService employeeInfoService; 


   public EmployeeInfo getCommentedEmployee() {
        EmployeeInfo employeeInfo;
        employeeInfo = employeeInfoService.getSingleEmployeeInfoByFkUserId(this.fkCommentedBy);
        if(employeeInfo != null) {
            this.commentedEmployee.setEmployeeId(employeeInfo.getEmployeeId());
            this.commentedEmployee.setFirstName(employeeInfo.getFirstName());
            this.commentedEmployee.setMiddleName(employeeInfo.getMiddleName());
            this.commentedEmployee.setLastName(employeeInfo.getLastName());
            this.commentedEmployee.setPhoto(employeeInfo.getPhoto());
            return commentedEmployee;
        } else {
            return null;
        }
    }

}

我试图通过 fkCommentedBy 属性在 getCommentedEmployee() 方法中找到一个 EmployeeInfo 对象，并将其设置为 @Transient 属性 commentedEmployee。

我发现以下错误：

2018-10-11 13:07:56.834  WARN 16756 --- [nio-8081-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: java.util.ArrayList[1]->com.activeboss.model.pm.ProjectTasks["projecttaskcommentsCollection"]->org.hibernate.collection.internal.PersistentBag[0]->com.activeboss.model.pm.ProjectTaskComments["commentedEmployee"])
2018-10-11 13:07:56.853  WARN 16756 --- [nio-8081-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: java.util.ArrayList[1]->com.activeboss.model.pm.ProjectTasks["projecttaskcommentsCollection"]->org.hibernate.collection.internal.PersistentBag[0]->com.activeboss.model.pm.ProjectTaskComments["commentedEmployee"])

我该如何解决？

标签： javaspring-bootspring-data-jpafasterxmljackson-databind

解决方案

@Transient 的目的是对非持久性属性进行建模，因此我不清楚当您通过“fkCommentedBy”属性将其持久化时，为什么要在 commentedByEmployee 属性上使用 @Transient。IMO，@ManyToOne 在这种情况下更合适。

@Entity
@Table(name = "projecttaskcomments")
public class ProjectTaskComments {

// .... other declarations 
@ManyToOne
@JoinColumn(name="fkCommentedBy")
private EmployeeInfo commentedEmployee;
// ..... other code
}

现在如果你仍然想使用@Transient，那么在getter 方法中你需要确保你有一个对EmployeeInfoService 对象的有效引用。@Autowired 在这里不起作用，因为 ProjectTaskComments 不是弹簧管理的 bean。

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