java.lang.NoSuchMethodException: com.ruoyi.web.controller.test.bean.HeadTeacher

软件开发过程中使用Java反射机制时遇到了下面的问题

com.ruoyi.web.controller.test.bean.HeadTeacher@4b9af9a9
com.ruoyi.web.controller.test.bean.HeadTeacher@4b9af9a9
java.lang.NoSuchMethodException: com.ruoyi.web.controller.test.bean.HeadTeacher.<init>(java.lang.String, int)
   at java.lang.Class.getConstructor0(Class.java:3082)
   at java.lang.Class.getConstructor(Class.java:1825)
   at com.ruoyi.web.controller.test.ReflectionDemo.getInstance(ReflectionDemo.java:49)
   at com.ruoyi.web.controller.test.ReflectionDemo.main(ReflectionDemo.java:69)

代码如下：

package com.ruoyi.web.controller.test;

import com.ruoyi.web.controller.test.bean.HeadTeacher;
import com.ruoyi.web.controller.test.bean.Student;
public class ReflectionDemo {
    /**
     * @param className
     * @param params     代表参数的值
     * @param paramsType 代表构造器参数的类型
     * @return
     */
    public Object getInstance(String className, Object[] params, Class[] paramsType) {

        Object obj = null;
        Class clazz = null;

        try {
            //获取className字符串所代表的类的Class实例
            clazz = Class.forName(className);
            //使用clazz获取className所代表的类的构造器，然后使用newInstance方法获取这个类的实例
            obj = clazz.getConstructor(paramsType).newInstance(params);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return obj;
    }

    public static void main(String[] args) {
        ReflectionDemo demo = new ReflectionDemo();

        /**
         * 测试带参数的方法
         */
        Object obj = demo.getInstance("com.ruoyi.web.controller.test.bean.HeadTeacher"
                ,new Object[]{"王校长",50},new Class[]{String.class,Integer.TYPE});

        HeadTeacher ht = new HeadTeacher();
        System.out.println(ht);

        ht.setHtName("王本山");
        ht.setHtAge(48);
        System.out.println(ht);

    }
}

JavaBean对象代码：

package com.ruoyi.web.controller.test.bean;

public class HeadTeacher {
    private String htName;
    private int htAge;

    public String getHtName() {
        return htName;
    }

    public void setHtName(String htName) {
        this.htName = htName;
    }

    public int getHtAge() {
        return htAge;
    }

    public void setHtAge(int htAge) {
        this.htAge = htAge;
    }


    public void sayHello() {
        System.out.println(this.htName + "\t" + this.htAge);
    }
}

反复分析给出的错误提示，发现实例化HeadTeacher对象时，该类中并不存在带参构造器，因此

bean对象中添加如下代码

public HeadTeacher(String name,int age){

this.htName= name;

this.htAge = age;

}