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Asked: 2026-05-13T15:42:42+00:00

I have this Tetris game written in Java, which uses DB to record high

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I have this Tetris game written in Java, which uses DB to record high scores. It worked ok as long as I was using remote MySQL DB, but now I’m trying to set up localhost DB using XAMPP MySQL and it keeps going like “SQLException: Communications link failure” at command:

con = java.sql.DriverManager.getConnection("jdbc:mysql://localhost/score", user, psw);

I guess it’s either wrong URL or DB configuration, but I really don’t know what to check. Any ideas?

EDIT: My friend has fixed my problem by replacing “localhost” in URL by “127.0.0.1” (which was quite embarrassing as you can surely imagine 😛 ).

So question is: Why is XAMPP not able to translate “localhost” into IP address and how to fix it?

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  1. Editorial Team

    Why is XAMPP not able to translate “localhost” into IP address and how to fix it?

    This is not a XAMPP problem nor a programming problem. This is more a DNS problem.

    To start, do you have a %SystemRoot%/system32/drivers/etc/hosts file with the following line as first line? (thus, after all comments, but before any other host declarations)

    127.0.0.1 localhost

    Update: as per the comments I’ve Googled a bit and it look like that the MySQL JDBC driver doesn’t eat IPv6 addresses at all. In other words, you’ll need to change ::1 to 127.0.0.1. But I also found this topic which mentions that you can use the following JVM argument to fix this problem:

    java -Djava.net.preferIPv4Stack=true
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