Thread local TableDescriptor#referencedColumnMap is not set to null when 
connection closes.
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                 Key: DERBY-4895
                 URL: https://issues.apache.org/jira/browse/DERBY-4895
             Project: Derby
          Issue Type: Bug
          Components: SQL
    Affects Versions: 10.6.2.1, 10.6.1.0, 10.5.3.0, 10.5.2.0, 10.5.1.1
            Reporter: Dag H. Wanvik
            Priority: Minor


> This has been seen to cause error messages in TomCat, cf. this quote from a 
> mail on derby-user:
> 
> http://mail-archives.apache.org/mod_mbox/db-derby-user/201011.mbox/%[email protected]%3e
> 
> SEVERE: The web application [/MyApp] created a ThreadLocal with key of type 
> [org.apache.derby.iapi.sq\
> l.dictionary.TableDescriptor$1] (value 
> [org.apache.derby.iapi.sql.dictionary.tabledescripto...@d133a3])\
>  and a value of type [java.util.WeakHashMap] (value [{={1, 2, 3, 4}, =null, 
> =null}]) but failed to remo\
> ve it when the web application was stopped. This is very likely to create a 
> memory leak.


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