java - SpringBoot无法基于JSON创建类的实例

Question

我在 Spring 启动时遇到问题。这是 Controller

public void addNewWatcher (@RequestBody WatcherInput input) {
        boolean isDeptIDExist = false;
        boolean isCourseIDExist = false;
        for(Department department : manager){
            if(input.getDeptId() == department.getDepartmentID()){
                isDeptIDExist = true;
                for(Course course : department.getCourses()){
                    if(input.getCourseId() == course.getCourseID()){
                        isCourseIDExist = true;
                        break;
                    }
                }
            }
        }
        if(!isDeptIDExist || !isCourseIDExist){
            throw new RESTFileNotFound("deptID or courseID do not exist");
        }

        try {
            Course course = manager.get(input.getDeptId()).getCourse(input.getCourseId());
            ApiCourseWrapper selectedCourse = new ApiCourseWrapper(input.getCourseId(), course.getCatalog());
            ApiDepartmentWrapper selectedDepartment = new ApiDepartmentWrapper(input.getDeptId(), course.getSubject());

            ApiWatcherWrapper newWatcher = new ApiWatcherWrapper(nextWatcherID.incrementAndGet(), selectedDepartment, selectedCourse);
            watchers.add(newWatcher);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

观察者输入

public class WatcherInput {
    private int deptId = 0;
    private int courseId = 0;

    public WatcherInput() {
    }

    public WatcherInput(int deptId, int courseId) {
        this.deptId = deptId;
        this.courseId = courseId;
    }

    public int getDeptId() {
        return (int)deptId;
    }

    public int getCourseId() {
        return (int)courseId;
    }
}

问题是“JSON解析错误:无法构造API.WrapperClass.WatcherInput的实例(尽管至少存在一个创建者):没有用于从Number反序列化的int/Int参数构造函数/工厂方法值 (11)；嵌套异常为 com.fasterxml.jackson.databind.exc.MismatchedInputException:无法构造 API.WrapperClass.WatcherInput 的实例(尽管至少存在一个 Creator):无 int/Int-参数构造函数/工厂方法从数字值 (11)\n 反序列化 [源:(PushbackInputStream)；行:1，列:1]"，

我认为SpringBoot无法创建WatcherInput的实例，但我不知道为什么

Answer 1

您可以尝试改为使用 int 类型 Integer 吗？反序列化其中一个数字时似乎遇到问题。