[MC-18294] One can spam a server log using anvils

When you rename a stack of items and it would cost more then 40 levels, it lowers the price. But, it also adds a message to the log. Seeing as this message appears without doing the rename, you could potentially fill the server log with too much spam, and cause trouble. This is a debug message too, so the removal will not cause any problem.

2013-06-17 12:57:22 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:22 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:22 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:23 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:23 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:23 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:23 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:23 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:23 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:23 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:24 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:57:24 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:58:00 [CLIENT] [INFO] [CHAT] Saved screenshot as 2013-06-17_12.57.
59.png
2013-06-17 12:58:05 [CLIENT] [INFO] [CHAT] Saved screenshot as 2013-06-17_12.58.
03.png
2013-06-17 12:58:25 [CLIENT] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:58:25 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:58:28 [CLIENT] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:58:28 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:08 [SERVER] [INFO] [pokechu22: Set own game mode to Survival Mo
de]
2013-06-17 12:59:08 [CLIENT] [INFO] [CHAT] Your game mode has been updated
2013-06-17 12:59:12 [CLIENT] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:12 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:12 [CLIENT] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:12 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:14 [CLIENT] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:14 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:17 [CLIENT] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:17 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:19 [CLIENT] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels
2013-06-17 12:59:19 [SERVER] [INFO] Naming an item only, cost too high; giving d
iscount to cap cost to 39 levels

The real danger is covering up greifing proof or anything.
To do this, you need a anvil, and a small amount of some common thing.
Insert the item in the anvil, then type random stuff in the rename box.
It appears in the debug log.