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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4895) Thread local TableDescriptor#referencedColumnMap is not set to null when connection closes.
Date Tue, 09 Nov 2010 20:43:07 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930282#action_12930282
] 

Dag H. Wanvik commented on DERBY-4895:
--------------------------------------

Sadly, the lcc isn't necessarily available, cf this assert on finding an lcc from context:

Caused by: org.apache.derby.shared.common.sanity.AssertFailure: ASSERT FAILED
	at org.apache.derby.shared.common.sanity.SanityManager.ASSERT(SanityManager.java:98)
	at org.apache.derby.iapi.sql.dictionary.TableDescriptor.referencedColumnMapPut(TableDescriptor.java:144)
	at org.apache.derby.iapi.sql.dictionary.TableDescriptor.setReferencedColumnMap(TableDescriptor.java:375)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.getTableDescriptor(DataDictionaryImpl.java:2034)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.faultInTabInfo(DataDictionaryImpl.java:9062)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.getNonCoreTI(DataDictionaryImpl.java:8865)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.addDescriptor(DataDictionaryImpl.java:1840)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.createSystemProcedureOrFunction(DataDictionaryImpl.java:9823)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.createSystemProcedureOrFunction(DataDictionaryImpl.java:9879)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.create_SYSIBM_procedures(DataDictionaryImpl.java:10584)
	at org.apache.derby.impl.sql.catalog.DataDictionaryImpl.boot(DataDictionaryImpl.java:737)
	at org.apache.derby.impl.services.monitor.BaseMonitor.boot(BaseMonitor.java:1979)
	at org.apache.derby.impl.services.monitor.TopService.bootModule(TopService.java:333)
	at org.apache.derby.impl.services.monitor.BaseMonitor.startModule(BaseMonitor.java:531)
	at org.apache.derby.iapi.services.monitor.Monitor.bootServiceModule(Monitor.java:427)
	at org.apache.derby.impl.db.BasicDatabase.boot(BasicDatabase.java:211)
	at org.apache.derby.impl.services.monitor.BaseMonitor.boot(BaseMonitor.java:1979)
	at org.apache.derby.impl.services.monitor.TopService.bootModule(TopService.java:333)
	at org.apache.derby.impl.services.monitor.BaseMonitor.bootService(BaseMonitor.java:1816)
	at org.apache.derby.impl.services.monitor.BaseMonitor.createPersistentService(BaseMonitor.java:1002)
	at org.apache.derby.iapi.services.monitor.Monitor.createPersistentService(Monitor.java:596)
	at org.apache.derby.impl.jdbc.EmbedConnection.createDatabase(EmbedConnection.java:2528)


> 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
>            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/%3C7800E37B639BC345BC2AB40980B7C529180FB525@MERCMBX03R.na.SAS.com%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.TableDescriptor$1@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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