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https://issues.apache.org/jira/browse/XERCESJ-1205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621259#action_12621259
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Dannes Wessels commented on XERCESJ-1205:
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I encountered the same issue during the development of the exist-db project. 
For performance reasons we cache the SAX parser and use the XMLGrammarPoolImpl 
object. Example code for triggering the issue can be found here 
http://existdb-contrib.googlecode.com/svn/trunk/XercesGrammarCache/ in 
src/grammarcache ; I guess I need to to some cleanup here.

anyway, my get around for the moment is to remove all cached DTDs from the pool 
when the reader is returned to the pool. A parser.reset() does not help either.

> Entity resolution does not work with DTD grammar caching resolved
> -----------------------------------------------------------------
>
>                 Key: XERCESJ-1205
>                 URL: https://issues.apache.org/jira/browse/XERCESJ-1205
>             Project: Xerces2-J
>          Issue Type: Bug
>          Components: DTD
>    Affects Versions: 2.8.1
>         Environment: JDK1.5. The issue appears on various machines, Windows, 
> Linux, Mac OSX. I don't believe it is platform specific.
>            Reporter: Tin Pavlinic
>         Attachments: bug.zip
>
>
> We have a DTD which defines some entities. We are parsing multiple documents 
> against this DTD. If grammar caching is enabled, the entities are unresolved 
> when the grammar is loaded from the cache, instead of the DTD. 
> It seems that they are cleared every time a document is parsed and are only 
> loaded when a DTD is loaded and not from the cache.

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