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我有验证问题在百里香。我的情况是保存具有职位和角色的员工。当验证有错误时，这两个“字段”会导致LazyInitializationException。如果通过验证员工将保存到数据库，一切都可以。请给我一些建议，我做错了什么，或者我该如何解决它。Thymeleaf @Valid LazyInitializationException
请看看下面我的代码：
EmployeeController：
@Controller
public class EmployeeController extends BaseCrudController {
// (........)
@RequestMapping(value = urlFragment + "/create", method = RequestMethod.GET)
public String createEmployee(Model model) {
prepareEmployeeForm(model);
return "crud/employee/create";
}
@RequestMapping(value = urlFragment + "/create", method = RequestMethod.POST)
public String processNewEmployee(Model model, @ModelAttribute("employeeForm") @Valid EmployeeForm employeeForm, BindingResult result) {
if (!result.hasErrors()) {
User user = employeeFormService.getUserFromEmployeeForm(employeeForm);
try {
userService.merge(user);
model.addAttribute("success", true);
prepareEmployeeForm(model);
} catch (Exception e) {
model.addAttribute("error", true);
}
} else {
initCollections(employeeForm, model);
}
return "crud/employee/create";
}
private void initCollections(EmployeeForm employeeForm, Model model)
{
employeeForm.setAllAvailableRoles(roleRepository.findAll());
employeeForm.setAllAvailablePositions(positionRepository.findByEnabledTrueOrderByNameAsc());
model.addAttribute("employeeForm", employeeForm);
}
private void prepareEmployeeForm(Model model) {
EmployeeForm employee = new EmployeeForm();
employee.setAllAvailablePositions(positionRepository.findByEnabledTrueOrderByNameAsc());
employee.setAllAvailableRoles(roleRepository.findAll());
model.addAttribute("employeeForm", employee);
}
}
EmployeeForm：
public class EmployeeForm extends BaseForm {
@Length(min = 2, max = 45)
private String firstName = "";
// (........)
private Position position;
private Collection<Role> roles;
private Collection<Position> allAvailablePositions;
private Collection<Role> allAvailableRoles;
public EmployeeForm() {
}
public Position getPosition() {
return position;
}
public void setPosition(Position position) {
this.position = position;
}
public Collection<Role> getRoles() {
return roles;
}
public void setRoles(Collection<Role> roles) {
this.roles = roles;
}
public Collection<Position> getAllAvailablePositions() {
return allAvailablePositions;
}
public void setAllAvailablePositions(Collection<Position> allAvailablePositions) {
this.allAvailablePositions = allAvailablePositions;
}
public Collection<Role> getAllAvailableRoles() {
return allAvailableRoles;
}
public void setAllAvailableRoles(Collection<Role> allAvailableRoles) {
this.allAvailableRoles = allAvailableRoles;
}
}
employeeForm.html
<form action="#" th:action="@{/panel/employee/create}" th:object="${employeeForm}" method="post">
<!--(......)-->
<div class="row">
<div class="col-md-6">
<label th:text="#{position}">Position</label>
<!--(Line 57 cause LazyInitializationException)--><select th:field="*{position}" class="form-control">
<option th:each="positionQ : *{allAvailablePositions}"
th:value="${{positionQ}}"
th:text="${positionQ.name}">Position name
</option>
</select>
</div>
<div class="col-md-6">
<label th:text="#{permissions}">Permissions</label>
<th:block th:each="role : *{allAvailableRoles}">
<p>
<input type="checkbox" th:id="${{role}}" th:value="${{role}}" th:field="*{roles}"/>
<label th:for="${{role}}"
th:text="#{${role.name}}">Role name</label>
</p>
</th:block>
</div>
</div>
</form>
跟踪：
HTTP Status 500 - Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring4.processor.attr.SpringSelectFieldAttrProcessor' (crud/employee/employeeForm:57)
根源：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring4.processor.attr.SpringSelectFieldAttrProcessor' (crud/employee/employeeForm:57)
根源
org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring4.processor.attr.SpringSelectFieldAttrProcessor' (crud/employee/employeeForm:57)
根源
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
我会任何帮助真的很高兴。