use server1;
    drop trigger if exists datainsert;
    DELIMITER $$

    CREATE TRIGGER datainsert
    AFTER INSERT ON `student` FOR EACH ROW
    begin
           DECLARE id_exists Boolean;
           DECLARE a INT;
           SELECT 1
           INTO @id_exists
           FROM student
           WHERE student.user_name= NEW.user_name;

           IF @id_exists = 1
           THEN

              set a = sys_exec('E://servers//Tomcat_instance1//webapps//Server//WEB-INF//classes//Test');
    END IF;
    END;
    $$
    DELIMITER ;

use server1;
    SET GLOBAL event_scheduler = ON;
    insert into student values('l5','Test@123','asd','asd','M','20','coimbatore','654321','9876543210','a@123.com')