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https://issues.apache.org/jira/browse/DERBY-4895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930586#action_12930586
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Dag H. Wanvik edited comment on DERBY-4895 at 11/10/10 7:50 AM:
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Uploading a patch which replaces the thread local storage of the
referencedColumnMap in favor of storing it in the lcc. This should solve the
problem seen by the user.
If several threads use the same connection, they will now share the
referencedColumnMap, but the API calls are serialized at the JDBC level, so
that's ok.
If a thread uses several connections, there will now be one map per connection,
which is ok, too.
Regressions ran ok.
was (Author: dagw):
Uploading a patch which replaces the thread local storage of the
referenceColumnMap in favor of storing it in the lcc. This should solve the
problem seen by the user.
If several threads use the same connection, they will now share the
referenceColumnMap, but they API calls are serialized at the JDBC level, so
that's ok.
If a thread uses several connections, there will now be one map per connection,
which is ok, too.
Regressions ran ok.
> Thread local TableDescriptor#referencedColumnMap is not set to null when
> connection closes.
> -------------------------------------------------------------------------------------------
>
> Key: DERBY-4895
> URL: https://issues.apache.org/jira/browse/DERBY-4895
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0, 10.6.2.1
> Reporter: Dag H. Wanvik
> Assignee: Dag H. Wanvik
> Priority: Minor
> Attachments: derby-4895-a.diff, derby-4895-a.stat
>
>
> > 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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