我在使用spring数据jpa时遇到了这个奇怪的错误。这是我的实体类。。。
// imports
@Entity
public class Activity {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
private String activity;
public Activity() {}
public Activity(String activity) {
this.activity = activity;
}
// getters and setters
}控制器类是。。。
// imports
@Controller
@RequestMapping("/students/activity")
public class ActivityController {
@Autowired
private ActivityService activityService;
@GetMapping("/new-activity")
public String displayForm(Model model) {
model.addAttribute("newActivity", new Activity());
return "students/activity-form";
}
@PostMapping("/save-activity")
public String saveActivity(Activity activity){
activityService.save(activity);
return "redirect:/students/activity/new-activity";
}
}我用的是自动对焦引擎。这是我的activity-form.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head><title>Activity Form</title></head>
<body>
<form action="/students/activity/save-activity" th:object="${newActivity}" method="POST" >
<label>Activity:</label>
<input type="text" th:field="*{activity}">
<button type="submit">Add activity</button>
</form>
</body>
</html>对我来说一切似乎都很好，但是当我提交活动时，它会在浏览器和控制台中显示错误请求和400错误
Resolved [org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'info.javacafe.studentforumapp.entities.Activity'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.lang.Integer] for value 'activity 1'; nested exception is java.lang.NumberFormatException: For input string: "activity1"]我认为spring试图将我的活动从字符串转换为整数，但我不知道为什么会发生这种情况。有人能帮我解释一下为什么会这样吗？
1条答案
按热度按时间de90aj5v1#
将控制器方法更新为
我认为缺少的model属性将正确Map表单值。