Databases
StackOverflow2013
Postsdbo
POJPA merge entity - from web restful jackson serialized entity
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJPA merge entity - from web restful jackson serialized entity
    primarykey
    data
    text
    <p>The project is using springmvc building the restful service, and JPA persist data into DB.</p> <p>I am recently working on update one object through web interface, i use jackson to deserialize post json data into object class. However, I have problem to merge object back to database. I sort of knew the object class deserialized from jackson is unmanaged, that is the reason I merge is nothing happen. Here is the sample code.</p> <p>Entity:</p> <pre><code>@Entity @Table(name="Parent") public class Parent{ @Id @GeneratedValue(strategy = GenerationType.AUTO) @JsonView(JsView.Public.class) @Column(name = "id") private Long Id; @NotNull @JsonView(JsView.Public.class) private String name; @NotNull @JsonView(JsView.Public.class) private String description; @NotNull @ManyToOne(fetch= FetchType.LAZY, cascade = {CascadeType.REFRESH}) @JoinColumn(name="creator_id") @JsonView(JsView.Internal.class) private User creator; @OneToMany(mappedBy="quest", cascade = {CascadeType.REFRESH}, orphanRemoval = true) private List&lt;Collaboration&gt; collaborators = new ArrayList&lt;Collaboration&gt;(); </code></pre> <p>}</p> <p>Restful Controller:</p> <pre><code> @RequestMapping(value = "/parent/{id}/update", method = RequestMethod.PUT) public ResponseEntity&lt;String&gt; updateQuestAttribute(@RequestBody String parentJson,@PathVariable("id") long parent_id) { ObjectMapper mapper = new ObjectMapper(); Parent parent = null; Parent newParent = mapper.readValue(parentJson, Parent.class); updateParent = parentService.updateParent(questNew,parent_id); </code></pre> <p>Service layer:</p> <pre><code>@PersistenceContext private EntityManager entityMgr; @Transactional public Parent updateParent(Parent newp, long id){ Parent old = findOne(id); Parent update = entityMgr.merge(newp); return update; } </code></pre> <p>I have tested this method with some managed object in Junit, all went fine. So, I guess all entity merge code is find in normal situation. Can anybody advise me what the problem is? thanks</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USryo
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. POJPA merge entity - from web restful jackson serialized entity
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI can not really understand what your updateParent should do : I think it should be : Parent old = findOne(id); Parent update = findOne(newp.id); update.setParent(old); return em.merge(update);
      singulars
      1. POJPA merge entity - from web restful jackson serialized entity
      1. USwillome
    2. COI just want to update parent object itself. Perhaps I chose the wrong object name, so it is unclear to you. Parent old = findOne(id) is to find old managed object in the persistent, then I want to merge newp object into old. However, the merge doesn't happen, because the newp was deseralized from json and it is unmanaged
      singulars
      1. POJPA merge entity - from web restful jackson serialized entity
      1. USryo
    3. COWhat's this questNew variable in the Controller? Why do you fetch old, and then not use it? Does the object deserialized from JSON have the id set?
      singulars
      1. POJPA merge entity - from web restful jackson serialized entity
      1. USKresimir Nesek
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload