Java Spring数据REST不包括资源中的实体链接 由Oliver Gierke的解决方案解决

看起来这是Spring4.2.0中的一个已知错误，升级到4.2.1提供了预期的功能

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原始问题 我正在努力将我的开发团队转移到Spring+WebMVC+DataREST+DataJPA+SpringHateOAS上，用于web应用程序。我当前的应用程序只是要维护我们正在进行的应用程序的列表

我的默认Spring数据REST设置遇到问题我的资源在其特定视图中不包含链接资源，而在集合视图中包含链接资源。

我不确定这是否是预期的行为，因此我将在本文的末尾包括相关的配置等

jv.local

是我的开发箱， 应用程序列表/应用程序是spring数据rest绑定到的位置（配置包括在下面）

例如：

curl jv.local:8080/apps-list/app/departments

返回：

{
  "_links" : {
    "self" : {
      "href" : "http://jv.local:8080/apps-list/app/departments{?page,size,sort}",
      "templated" : true
    }
  },
  "_embedded" : {
    "departments" : [ {
      "name" : "Dining",
      "_links" : {
        "self" : {
          "href" : "http://jv.local:8080/apps-list/app/departments/1",
          "templated" : false
        },
        "institution" : {
          "href" : "http://jv.local:8080/apps-list/app/departments/1/institution",
          "templated" : false
        }
      }
    }, {
      "name" : "Housing",
      "_links" : {
        "self" : {
          "href" : "http://jv.local:8080/apps-list/app/departments/2",
          "templated" : false
        },
        "institution" : {
          "href" : "http://jv.local:8080/apps-list/app/departments/2/institution",
          "templated" : false
        }
      }
    } ]
  }
}

（请特别注意，各部门的机构在_links中正确链接）

但是，拉动特定的部门会导致

curl jv.local:8080/apps-list/app/departments/1
{
  "name" : "Dining",
  "_links" : {
    "self" : {
      "href" : "http://jv.local:8080/apps-list/app/departments/1",
      "templated" : false
    }
  }
}

本部门未列出相关机构。有没有一种方法可以让该机构加入链接

实体定义 Department.java

@Entity
@Table(name="department")
public class Department {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    
    @Column(name="name")
    private String name;
    
    @ManyToOne(optional = false)
    @JoinColumn(name="institution", referencedColumnName="id")
    @RestResource
    private Institution institution;
    
    public Long getId() {
        return this.id;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    
    . . . more getters/setters like above
}

@Entity
@Table(name = "institution")
public class Institution {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "name", unique = true)
    private String name;

    public Long getId() {
        return this.id;
    }

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

    . . . name getter/setter
}

@RestResource(rel="departments",path="departments")
public interface DepartmentRepository extends JpaRepository<Department, Long> {
}

@RestResource(rel="institutions",path="institutions")
public interface InstitutionRepository extends JpaRepository<Institution, Long> {
    Institution findFirstByName(String name);
}

@Configuration
public class RestConfiguration extends RepositoryRestMvcConfiguration {
    @Override
    public RepositoryRestConfiguration config() {
      RepositoryRestConfiguration config = super.config();
      config.setBasePath("/app");
      return config;
    }
}

Institution.java

@Entity
@Table(name="department")
public class Department {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    
    @Column(name="name")
    private String name;
    
    @ManyToOne(optional = false)
    @JoinColumn(name="institution", referencedColumnName="id")
    @RestResource
    private Institution institution;
    
    public Long getId() {
        return this.id;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    
    . . . more getters/setters like above
}

@Entity
@Table(name = "institution")
public class Institution {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "name", unique = true)
    private String name;

    public Long getId() {
        return this.id;
    }

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

    . . . name getter/setter
}

@RestResource(rel="departments",path="departments")
public interface DepartmentRepository extends JpaRepository<Department, Long> {
}

@RestResource(rel="institutions",path="institutions")
public interface InstitutionRepository extends JpaRepository<Institution, Long> {
    Institution findFirstByName(String name);
}

@Configuration
public class RestConfiguration extends RepositoryRestMvcConfiguration {
    @Override
    public RepositoryRestConfiguration config() {
      RepositoryRestConfiguration config = super.config();
      config.setBasePath("/app");
      return config;
    }
}

存储库 DepartmentRepository.java

@Entity
@Table(name="department")
public class Department {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    
    @Column(name="name")
    private String name;
    
    @ManyToOne(optional = false)
    @JoinColumn(name="institution", referencedColumnName="id")
    @RestResource
    private Institution institution;
    
    public Long getId() {
        return this.id;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    
    . . . more getters/setters like above
}

@Entity
@Table(name = "institution")
public class Institution {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "name", unique = true)
    private String name;

    public Long getId() {
        return this.id;
    }

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

    . . . name getter/setter
}

@RestResource(rel="departments",path="departments")
public interface DepartmentRepository extends JpaRepository<Department, Long> {
}

@RestResource(rel="institutions",path="institutions")
public interface InstitutionRepository extends JpaRepository<Institution, Long> {
    Institution findFirstByName(String name);
}

@Configuration
public class RestConfiguration extends RepositoryRestMvcConfiguration {
    @Override
    public RepositoryRestConfiguration config() {
      RepositoryRestConfiguration config = super.config();
      config.setBasePath("/app");
      return config;
    }
}

RestConfiguration.java

@Entity
@Table(name="department")
public class Department {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    
    @Column(name="name")
    private String name;
    
    @ManyToOne(optional = false)
    @JoinColumn(name="institution", referencedColumnName="id")
    @RestResource
    private Institution institution;
    
    public Long getId() {
        return this.id;
    }
    
    public void setId(Long id) {
        this.id = id;
    }
    
    . . . more getters/setters like above
}

@Entity
@Table(name = "institution")
public class Institution {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column(name = "name", unique = true)
    private String name;

    public Long getId() {
        return this.id;
    }

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

    . . . name getter/setter
}

@RestResource(rel="departments",path="departments")
public interface DepartmentRepository extends JpaRepository<Department, Long> {
}

@RestResource(rel="institutions",path="institutions")
public interface InstitutionRepository extends JpaRepository<Institution, Long> {
    Institution findFirstByName(String name);
}

@Configuration
public class RestConfiguration extends RepositoryRestMvcConfiguration {
    @Override
    public RepositoryRestConfiguration config() {
      RepositoryRestConfiguration config = super.config();
      config.setBasePath("/app");
      return config;
    }
}

版本信息

• SpringWebMVC，4.2.0
• spring上下文，4.2.0
• 弹簧orm，4.2.0
• spring数据jpa 1.8.2
• jackson core 2.6.1
• jackson数据绑定2.6.1
• servlet 3.1.0
• spring数据rest webmvc 2.3.2
• 弹簧hateoas 0.18.0

求你了如果我能提供更多有用的信息，或者可能是一个正在工作的GH项目，请告诉我。如果这是预期的行为，是否有任何方法覆盖并强制显示链接

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谢谢你的时间

这是一个众所周知的问题，谢天谢地已经解决了。升级到Spring 4.2.1应该可以解决这个问题（或者Spring Boot 1.3 M5）