我目前正在編寫一個用戶編輯表單。Spring + Thymeleaf綁定表單NullpointerException
我有如下結構的用戶對象(僞代碼):
User
String name,
int age,
Address adress,
Email email,
User child,
getter/setter
現在,這個目標我把作爲對象的Model
如下所示:
@RequestMapping(value = "/{login}/edit", method = RequestMethod.GET)
public ModelAndView editUserByLogin(@PathVariable("login") final String login) {
final User currentUser = UserRepository.findPersonByLogin(login);
ModelAndView mav = new ModelAndView(URL_EDIT_USER);
mav.addObject(MODEL_USER, currentUser);
return mav;
}
在我模板(我用thymeleaf)我這樣綁定這些對象:
<form class="form-horizontal" method="post" >
<div class="form-group">
<label class="col-sm-2 control-label" th:text="#{user.name}">name</label>
<div class="col-sm-10">
<input type="text" class="form-control" th:field="*{user.name}" />
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" th:text="#{user.address.street}">name</label>
<div class="col-sm-10">
<input type="text" class="form-control" th:field="*{user.address.street}" />
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" th:text="#{user.child.email.value}">name</label>
<div class="col-sm-10">
<input type="text" class="form-control" th:field="*{user.child.email.value}" />
</div>
</div>
<div class="form-group">
<label class="col-sm-2 control-label" th:text="#{user.child.address.street}">name</label>
<div class="col-sm-10">
<input type="text" class="form-control" th:field="*{user.child.address.street}" />
</div>
</div>
</form>
在GET-Me模板/ html顯示我預期的正確數據。現在我編輯的字段並提交表單,然後我得到以下錯誤:
java.lang.NullPointerException: null
at com.example.user.model.Email.hashCode(EMail.java:66) ~[classes/:na]
at java.lang.Object.toString(Unknown Source) ~[na:1.8.0_25]
at java.lang.String.valueOf(Unknown Source) ~[na:1.8.0_25]
at java.lang.StringBuilder.append(Unknown Source) ~[na:1.8.0_25]
at org.springframework.validation.FieldError.toString(FieldError.java:102) ~[spring-context-4.0.8.RELEASE.jar:4.0.8.RELEASE]
at java.lang.String.valueOf(Unknown Source) ~[na:1.8.0_25]
at java.lang.StringBuilder.append(Unknown Source) ~[na:1.8.0_25]
at org.springframework.validation.AbstractErrors.toString(AbstractErrors.java:243) ~[spring-context-4.0.8.RELEASE.jar:4.0.8.RELEASE]
at org.springframework.validation.BindException.getMessage(BindException.java:284) ~[spring-context-4.0.8.RELEASE.jar:4.0.8.RELEASE]
at java.lang.Throwable.getLocalizedMessage(Unknown Source) ~[na:1.8.0_25]
at java.lang.Throwable.toString(Unknown Source) ~[na:1.8.0_25]
at java.lang.String.valueOf(Unknown Source) ~[na:1.8.0_25]
at java.lang.StringBuilder.append(Unknown Source) ~[na:1.8.0_25]
所有字段正確地傳輸,除非子對象的電子郵件領域。
我不知道爲什麼會出現錯誤,該結構是相同的,數據是有效的,有趣的是,當我搶孩子email元素在一個單獨的對象超出它
沒有人有一個想法?
在此先感謝。
編輯: 電子郵件類:
@Entity(name="Email")
public class Email implements Serializable
{
private static final long serialVersionUID = 6891079722082340011L;
@Id()
@GeneratedValue(strategy=GenerationType.AUTO)
@Expose
protected Long eMailId;
@Expose
protected String value;
//getter/setter
@Override
public boolean equals(Object obj)
{
if(obj instanceof EMail){
return value.equals(((Email) obj).getValue());
}
return false;
}
@Override
public int hashCode()
{
return value.hashCode();
}
}
POST方法:
@RequestMapping(value = "/{login}/edit", method = RequestMethod.POST)
public ModelAndView updateUser(@PathVariable("login") final String login, @ModelAttribute final User webUser) {
final Person repoUser = personRepository.findPersonByLogin(login);
repoUser.updateWith(webUser);
return new ModelAndView("redirect:" + URL_USERS_OVERVIEW);
}
post com.example.user.model.Email and EMail.java – 2014-12-03 15:40:17
對不起,這是我的錯。我已經更正了代碼詞彙的拼寫。 EMail類與Email類似。我的工作有代碼。我認爲這取決於冬眠的註釋。我用於控制器的類與我用於數據庫(實體)的類相同。明天我會更新代碼。 – 2014-12-03 18:56:17
您是否也可以添加帖子處理方法,因爲您只有獲取處理方法 – Aeseir 2014-12-04 02:16:15