Problem with optional Compression module...

[Andrzej Jan Taramina]

If you enable the optional Compression Module, it won't load when Tomcat/eXist starts up (if you are using a war-based
eXist implementation running inside Tomcat) with the following error in the exist logs:

2009-11-04 11:48:46,000 [main] WARN  (XQueryContext.java [lookupModuleClass]:2816) - Module
http://exist-db.org/xquery/compression could not be initialized due to a missing dependancy (NoClassDefFoundError):
org/apache/tools/tar/TarOutputStream

Doing some digging, I found that the class TarOutputStream class is found in the ant.jar file which is not something
that is included in the war by default.

I'm not really sure we should be using ant.jar and the TarOutputStream class therein in an eXist runtime module. It
would seem very wrong to include ant.jar in a production war that way.

We could create a stripped down jar file just including the TarOutputStream and related classes and put it in
eXist/lib/optional as one approach to resolve this.

Any suggestions as to how best to fix the issue, without including the whole ant.jar in a production deployment?

--
Andrzej Taramina
Chaeron Corporation: Enterprise System Solutions
http://www.chaeron.com

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[Adam Retter-3]

We could perhaps use the Apache commons compress package instead. But
isnt Ant shipped with eXist?

2009/11/4 Andrzej Jan Taramina <andrzej@...>:

> If you enable the optional Compression Module, it won't load when Tomcat/eXist starts up (if you are using a war-based
> eXist implementation running inside Tomcat) with the following error in the exist logs:
>
> 2009-11-04 11:48:46,000 [main] WARN  (XQueryContext.java [lookupModuleClass]:2816) - Module
> http://exist-db.org/xquery/compression could not be initialized due to a missing dependancy (NoClassDefFoundError):
> org/apache/tools/tar/TarOutputStream
>
> Doing some digging, I found that the class TarOutputStream class is found in the ant.jar file which is not something
> that is included in the war by default.
>
> I'm not really sure we should be using ant.jar and the TarOutputStream class therein in an eXist runtime module. It
> would seem very wrong to include ant.jar in a production war that way.
>
> We could create a stripped down jar file just including the TarOutputStream and related classes and put it in
> eXist/lib/optional as one approach to resolve this.
>
> Any suggestions as to how best to fix the issue, without including the whole ant.jar in a production deployment?
>
> --
> Andrzej Taramina
> Chaeron Corporation: Enterprise System Solutions
> http://www.chaeron.com
>
> ------------------------------------------------------------------------------
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--
Adam Retter

eXist Developer
{ United Kingdom }
adam@...
irc://irc.freenode.net/existdb

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[Dannes Wessels-2]

hi,

On 4 Nov 2009, at 18:02 , Andrzej Jan Taramina wrote:

We could create a stripped down jar file just including the TarOutputStream and related classes and put it in
eXist/lib/optional as one approach to resolve this.

Any suggestions as to how best to fix the issue, without including the whole ant.jar in a production deployment?

some time ago I added a jar file for this....... now it turns out it does contain the wrong classes :-)

unzip -t ./lib/optional/commons-compress-1.0.jar | grep -i tar

    testing: org/apache/commons/compress/archivers/tar/   OK

    testing: org/apache/commons/compress/archivers/tar/TarArchiveEntry.class   OK

    testing: org/apache/commons/compress/archivers/tar/TarArchiveInputStream.class   OK

    testing: org/apache/commons/compress/archivers/tar/TarArchiveOutputStream.class   OK

    testing: org/apache/commons/compress/archivers/tar/TarBuffer.class   OK

    testing: org/apache/commons/compress/archivers/tar/TarConstants.class   OK

    testing: org/apache/commons/compress/archivers/tar/TarUtils.class   OK

let's check wether these are compatible.....

Kind regards

Dannes

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[Andrzej Jan Taramina]

Adam:

> We could perhaps use the Apache commons compress package instead. But
> isnt Ant shipped with eXist?

My point is that the ant jar should not have to be included in a war, for when you are deploying eXist in a container
(like Tomcat) rather than using the standalone version.

+1 on using the commons compress package instead, as it's already included in the jars.


--
Andrzej Taramina
Chaeron Corporation: Enterprise System Solutions
http://www.chaeron.com

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