Memory Leaks in slfj4

Hello there!
I’m working on glassfish4, and when I undeploy my vaadin project, a log prints:

The web application
[/project] created a ThreadLocal with key of type [org.apache.log4j.helpers.ThreadLocalMap]
(value [org.apache.log4j.helpers.ThreadLocalMap@2c04e3a6]
) and a value of type [java.util.Hashtable]
(value [{}]
) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Well, well, now when I googled on, I found: and

I suspect, that these two bugs, yields on

What do you think?