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The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
02:05:16 [INFO] [iConomy] Database Error: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
02:05:16 [INFO] [iConomy] Database Error: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
02:05:16 [INFO] [iConomy] Database Error: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
02:05:16 [INFO] [iConomy] Database Error: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
It seems that it just doesn't print a very detailed error message. Some basic things to check are that you have your SQL information entered correctly for that plugin. If this is connecting to a database on our web hosting, remember to use your site's DNS address and not "localhost".
I somehow missed the first page of this thread and see some things were already discussed. Since you are running both the game server and the SQL server on the same machine, an external address is not needed. Incorrect information would also cause a constant problem, and not one that comes and goes.
As Edge mentioned above, the plugin really needs to give better information, but it isn't coded to do so.