jsp ページの Spring MVC コントローラーのモデルとして JPA エンティティー Bean を使用しています。jsp ページの 1 つは、すべてのプロパティを表示していないこのエンティティの部分ビューです。コントローラーからサービス レイヤーを使用してエンティティを更新しようとすると、jsp フォームで使用されるプロパティのみが保持され、他のすべてのプロパティは無効になります。この状況を処理する正しい方法は何ですか? フォームで隠しフィールドを指定する必要はありません。
この場合、コントローラーが service.update(client) メソッドを呼び出すと、name フィールドは form.jsp に存在しないため null になります。
フォーム.jsp
<form:form modelAttribute="client" method="get" action="${action}">
<table width="100%">
<tr>
<td>
<table>
<tr>
<td valign="top"><spring:message code="label.tradeOrderManagementSystem"/>:</td>
<td>
<form:select path="tradeOrderManagementSystems" >
<form:options items="${tradeOrderManagementSystemList}" itemValue="id" itemLabel="name" />
</form:select>
<a href="<spring:url value="/tradeOrderManagementSystem/add"/>" class="addAndReturn"><span><spring:message code="add"/></span></a>
</td>
<td>
<form:errors path="tradeOrderManagementSystems" cssClass="errors" />
</td>
</tr>
<tr><td></td><td> </td></tr>
</table>
</td>
</tr>
</table>
<input type="hidden" name="submitted" value="true">
コントローラ
@RequestMapping("/{id}/edit")
public ModelAndView edit(HttpServletRequest request,
HttpServletResponse response,
@ModelAttribute("client") Client client,
BindingResult result,
@PathVariable("id") int id,
Model model) {
ControllerContext ctx = new ControllerContext(request, response);
init(ctx);
setAdvancedSearchAvailable(ctx, true);
buildShowAndEditVerticalMenu(ctx, id, false);
if (id == 0) {
result.addError(new ObjectError("client", getMessage("error.idNeeded")));
return getModelAndView(ctx, "itEfficiencies/form");
} else {
if (!isSubmission(ctx)) {
client = clientService.find(id);
model.addAttribute("client", client);
fillClientForm(model);
return getModelAndView(ctx, "itEfficiencies/form");
} else {
//clientValidator.validate(client, result);
if (result.hasErrors()) {
fillClientForm(model);
return getModelAndView(ctx, "itEfficiencies/form");
} else {
try {
//checkClientProperties(client);
client.setId(id);
client = clientService.update(client); //method updates only form fields and nulls out all others
} catch (Exception e) {
e.printStackTrace();
result.addError(new ObjectError("client", getMessage("error.save")));
fillClientForm(model);
return getModelAndView(ctx, "itEfficiencies/form");
}
return getModelAndView(ctx, "/staffingByClient/" + client.getId() + "/show", true);
}
}
}
}
クライアント.java
@Entity
public class Client extends AbstractEntity<Integer> {
private static final long serialVersionUID = 1L;
public static final String FIND_BY_NAME = "Client.FIND_BY_NAME";
public static final String COUNT_BY_NAME = "Client.COUNT_BY_NAME";
@Basic(optional = false)
@Column(nullable = false, length = 125)
private String name;
@ManyToMany(fetch = FetchType.LAZY)
@JoinTable(inverseJoinColumns = {
@JoinColumn(name = "trade_order_management_system_id")}, uniqueConstraints =
@UniqueConstraint(name = "UK_client_trade_order_mgmt_client_id_trade_order_mgmt_id",
columnNames = {"client_id", "trade_order_management_system_id"}))
@ForeignKey(name = "FK_client_trade_order_management_systems_client_id",
inverseName = "FK_client_trade_order_mgmt_sys_trade_order_management_system_id")
private List<TradeOrderManagementSystem> tradeOrderManagementSystems;
public Client() {
}
public Client(Integer id) {
this.id = id;
}
public Client(Integer id, String name) {
this.id = id;
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<TradeOrderManagementSystem> getTradeOrderManagementSystems() {
return tradeOrderManagementSystems;
}
public void setTradeOrderManagementSystems(List<TradeOrderManagementSystem> tradeOrderManagementSystems) {
this.tradeOrderManagementSystems = tradeOrderManagementSystems;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Client)) {
return false;
}
Client other = (Client) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
}
サービス方法
public abstract class CrudService<T, ID extends Serializable> extends DAOImpl<T, ID> {
/**
* Updates an entity from an existing entity.
*
* @since 0.0.1
*
* @param entity
* @return the managed instance of the updated entity
*/
@Override
@Transactional(rollbackFor = Exception.class, isolation = Isolation.READ_COMMITTED)
public T update(T entity, ID id) {
return super.update(assignDefaultValues(entity), id);
}
}
public abstract class DAOImpl<T, ID extends Serializable> implements DAO<T, ID> {
private Class<T> persistentClass;
@PersistenceContext(unitName = "krfsPersistenceUnit")
protected EntityManager entityManager;
/**
* Instantiates an instance of this class and sets the <code>persistentClass</code>
* based on the identifier type
*
* @since 0.0.1
*/
public DAOImpl() {
this.persistentClass = (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
}
/**
* @since 0.0.1
*
* @return the type to be persisted
*/
@Override
public Class<T> getPersistentClass() {
return persistentClass;
}
/**
* Updates an entity from an existing entity.
*
* @since 0.0.1
*
* @param entity
* @param id the identifier of the entity
*
* @return the managed instance of the updated entity
*/
@Override
public T update(T entity, ID id) {
//Find a managed instance of the entity first and copy the properties
//to the passed in entity before merging. This ensures that entityManager
//will not create a new entity with merge.
Object ref = this.entityManager.getReference(persistentClass, id);
if (ref != null) {
BeanUtils.copyProperties(entity, ref);
}
return (T) this.entityManager.merge(ref);
}
}