error connecting to mysql using java
String url = "jdbc:mysql://localhost:3306/";
    String dbName = "mta_db";
    String driver = "com.mysql.jdbc.Driver";
    String userName = "tomcat";
    String password = "tomcat";
    try {
        Class.forName(driver).newInstance();
        _conn = DriverManager.getConnection(url + dbName, userName, password);
    } catch (Exception e) {
        e.printStackTrace();
    }

GRANT ALL ON mta_db.* to tomcat@'%' identified by 'yourpassword';