[mysql] connecting MySQL server to NetBeans

  1. Close NetBeans.

  2. Stop MySQL Server.

  3. Update MySQL (if available)

  4. Start MySQL Server.

  5. Open NetBeans.

If still doesn't connect, download MySQL Connector/J and add mysql-connector-java-[version].jar to your classpath and also to your Webserver's lib directory. For instance, Tomcat lib path in XAMPP is
C:\xampp\tomcat\lib.
Then repeat the steps again.