关闭连接时收到警告“异常堆栈跟踪：**开始嵌套异常** ...”

Question

我正在做一个简单的java-MySQL连接程序，以从mysql数据库中获取结果并进行打印。
每当我关闭连接时，都会出现“ EXCEPTION STACK TRACE”警告。
但是，如果我删除con.close（）或发表评论，则不会发出警告。

我正在使用
JDK：jdk-11.0.3
Mysql驱动程序：mysql-connector-java-8.0.15.jar
Eclipse：eclipse-java-2019-03-R-win32-x86_64

我尝试通过此link中的代码来修改我的代码，因为它对我不起作用...
已从this link的链接上方...
以下两个链接也都提到了...

---以上链接---
链接1：https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-usagenotes-statements.html#connector-j-examples-execute-select
链接2：https://bugs.mysql.com/bug.php?id=93590

我的代码：

package Practice_Work;

import java.sql.*;
import java.util.*;

public class Authenticate_onePS {

    public static void main(String[] args) throws Exception {

        //Loading Driver(Not Necessary Here)
        Class.forName("com.mysql.jdbc.Driver");


        //Setting Connection with DB
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/practice_work", "root", "nlvg3412");


        //Making Prepared Statements
        PreparedStatement ps = con.prepareStatement("select * from authenticate_user where user_name = ? or user_pswd = ?");


        boolean check = true;
        boolean flag = false;

        //Entering Values
        while(check) {
            Scanner sc = new Scanner(System.in);

            if(flag) {
                System.out.println("\n************************************************************");
                System.out.println("Please, Enter your credentials again...\n");
            }

            System.out.print("Enter Username : ");
            String name = sc.next();

            System.out.print("Enter Password : ");
            String pswd = sc.next();

            ps.setString(1, name);
            ps.setString(2, pswd);


            //Making Result Set
            ResultSet rs = ps.executeQuery(); 

            String db_name = "";
            String db_pswd = "";

            while(rs.next()) {
                db_name = rs.getString("user_name");
                db_pswd = rs.getString("user_pswd");

                //System.out.println(db_name + "     " + db_pswd);
            }


        //Checking for entered credentials      
            if(name.equals(db_name) && pswd.equals(db_pswd)) {
                System.out.println("\nLOGIN Successfully\n");
                check = false;
            }
            else if(!name.equals(db_name) && pswd.equals(db_pswd)) {
                System.out.println("\nUsername INCORRECT\n");
                flag = true;
            }
            else if(name.equals(db_name) && !pswd.equals(db_pswd)) {
                System.out.println("\nPassword INCORRECT\n");
                flag = true;
            }
            else {
                System.out.println("\nINVALID Username and Password\n");
                flag = true;
            }
        }


        //Closing Connection        
        con.close();


    }

}

我希望结果是“成功登录”或代码的打印语句中的某些内容，但实际输出为

LOGIN Successfully

Sat Apr 27 21:49:12 IST 2019 WARN: Caught while disconnecting...

EXCEPTION STACK TRACE:



** BEGIN NESTED EXCEPTION ** 

javax.net.ssl.SSLException
MESSAGE: closing inbound before receiving peer's close_notify

STACKTRACE:

javax.net.ssl.SSLException: closing inbound before receiving peer's close_notify
    at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:129)
    at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:117)
    at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:308)
    at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:264)
    at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:255)
    at java.base/sun.security.ssl.SSLSocketImpl.shutdownInput(SSLSocketImpl.java:645)
    at java.base/sun.security.ssl.SSLSocketImpl.shutdownInput(SSLSocketImpl.java:624)
    at mysql.connector.java@8.0.15/com.mysql.cj.protocol.a.NativeProtocol.quit(NativeProtocol.java:1319)
    at mysql.connector.java@8.0.15/com.mysql.cj.NativeSession.quit(NativeSession.java:182)
    at mysql.connector.java@8.0.15/com.mysql.cj.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:1750)
    at mysql.connector.java@8.0.15/com.mysql.cj.jdbc.ConnectionImpl.close(ConnectionImpl.java:720)
    at Practice_Work.Authenticate_onePS.main(Authenticate_onePS.java:79)


** END NESTED EXCEPTION **