JPA多對多在ASSOCATION表中沒有堅持

我想下面的單元測試：JPA多對多在ASSOCATION表中沒有堅持

@Test 
    @Transactional 
    public void thatFolderLocationAssociationTableIsWorking() { 
     Location l1 = new DomesticLocation(); 
     l1.setDeptName("Test name 1"); 
     Location l2 = new DomesticLocation(); 
     l2.setDeptName("Test name 2"); 

     KMLFolder k1 = new KMLFolder(); 
     k1.setName("Test name 1"); 
     KMLFolder k2 = new KMLFolder(); 
     k1.setName("Test name 2"); 

     List<Location> locations = new ArrayList<Location>(); 
     locations.add(l1); 
     locations.add(l2); 
     k1.setLocations(locations); 
     kmlFolderServiceImpl.save(k1); 

     assertEquals("Test name 1", kmlFolderServiceImpl.find(1L).getLocations().get(0).getDeptName()); 
     assertEquals("Test name 2", kmlFolderServiceImpl.find(1L).getLocations().get(1).getDeptName()); 

       //The following line gets the NPE 
     assertEquals("Test name 1", locationServiceImpl.find(1L).getKmlFolderList().get(0).getName()); 
    }

我越來越哪裏我試圖找回從Locations其他斷言是KMLFolder.getName()在拉斯特斷言的NPE工作，我從KMLFolder得到Location名稱。

這裏是我的JPA定義：

@ManyToMany(mappedBy="kmlFolderList", cascade=CascadeType.ALL) 
private List<Location> locations = new ArrayList<Location>(); 

@ManyToMany 
@JoinTable(name="LOCATION_KMLFOLDER", 
    joinColumns={@JoinColumn(name="KMLFOLDER_ID", referencedColumnName="ID")}, 
    inverseJoinColumns={@JoinColumn(name="LOCATION_ID", referencedColumnName="ID")} 
)

當我運行測試正在創建相應的表。這裏的控制檯輸出：

Hibernate: 
    create table project.LOCATION_KMLFOLDER (
     KMLFOLDER_ID bigint not null, 
     LOCATION_ID bigint not null 
    ) ENGINE=InnoDB 
... 
Hibernate: 
    alter table project.LOCATION_KMLFOLDER 
     add index FK_lqllrwb2t5cn0cbxxx3ms26ku (LOCATION_ID), 
     add constraint FK_lqllrwb2t5cn0cbxxx3ms26ku 
     foreign key (LOCATION_ID) 
     references project.KMLFolder (id) 
Hibernate: 
    alter table .LOCATION_KMLFOLDER 
     add index FK_ckj00nos13yojmcyvtefgk9pl (KMLFOLDER_ID), 
     add constraint FK_ckj00nos13yojmcyvtefgk9pl 
     foreign key (KMLFOLDER_ID) 
     references project.Locations (id)

控制檯不會顯示插入到LOCATION_KNLFOLDER表，如我所料。有關爲什麼會發生這種情況的任何想法？

來源

2014-01-07 Joe Essey

您正在初始化Hibernate忽略的關聯的反面，而不是初始化Hibernate不會忽略的關聯的所有者端（或者除此之外）。

所有者方是沒有mappedBy屬性的一面。

來源

2014-01-07 16:19:28

JPA多對多在ASSOCATION表中沒有堅持

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