Java Spring bean with private constructor

Question

Is possible in Spring that class for bean doesn\'t have public constructor but only private ? Will this private constructor invoked when bean is created? Thanks.

Answer 1

Yes, Private constructors are invoked by spring. Consider my code:

Bean definition file:

Bean class:

package com.aa.testp;

public class Message {

    private String message;

    private Message(String msg) {
       // You may add your log or print statements to check execution or invocation
        message = msg;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public void display() {
        System.out.println(" Hi " + message);
    }

}

The above code works fine. Hence, spring invoked the private constructor.