Yes, as Christophe said you need to give enough memory to XWiki
especially if you have lot's of document in the database.

See http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Performances#HMemory
for more details.

On Thu, Mar 26, 2009 at 14:08, PERINAUD Christophe
<christophe.perin...@kbl-bank.com> wrote:
> Hi
>
> I think you have to change JAVA_OPTS in the script to start the server.
> In my case i replaced "set JAVA_OPTS=-Xmx300m" with "set JAVA_OPTS=-Xmx512m" 
> to allocate 512M for the java process
>
> Christophe
>
> -----Message d'origine-----
> De : users-boun...@xwiki.org [mailto:users-boun...@xwiki.org] De la part de 
> Hernández Cuchí, Francisco Ricardo
> Envoyé : jeudi 26 mars 2009 14:01
> À : XWiki Users
> Objet : Re: [xwiki-users] Export from 1.7 and import in 1.8
>
> You are right
>
> I get this:
>
> Wrapped Exception:
>
>
> java.lang.OutOfMemoryError: Java heap space
>        at java.util.Arrays.copyOf(Arrays.java:2882)
>        at 
> java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.
> java:100)
>        at 
> java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390
> )
>        at java.lang.StringBuffer.append(StringBuffer.java:224)
>        at java.io.StringWriter.write(StringWriter.java:84)
>        at org.dom4j.io.XMLWriter.writeElement(XMLWriter.java:962)
>        at org.dom4j.io.XMLWriter.writeNode(XMLWriter.java:1301)
>        at org.dom4j.io.XMLWriter.writeElementContent(XMLWriter.java:1136)
>        at org.dom4j.io.XMLWriter.writeElement(XMLWriter.java:954)
>        at org.dom4j.io.XMLWriter.writeNode(XMLWriter.java:1301)
>        at org.dom4j.io.XMLWriter.writeElementContent(XMLWriter.java:1136)
>        at org.dom4j.io.XMLWriter.writeElement(XMLWriter.java:954)
>        at org.dom4j.io.XMLWriter.writeNode(XMLWriter.java:1301)
>        at org.dom4j.io.XMLWriter.write(XMLWriter.java:344)
>        at com.xpn.xwiki.doc.XWikiDocument.toXML(XWikiDocument.java:2261)
>        at com.xpn.xwiki.doc.XWikiDocument.toXML(XWikiDocument.java:2313)
>        at com.xpn.xwiki.plugin.packaging.Package.addToZip(Package.java:887)
>        at com.xpn.xwiki.plugin.packaging.Package.export(Package.java:332)
>        at 
> com.xpn.xwiki.plugin.packaging.PackageAPI.export(PackageAPI.java:194)
>
>        at 
> com.xpn.xwiki.plugin.packaging.PackageAPI.backupWiki(PackageAPI.java:
> 215)
>        at com.xpn.xwiki.web.ExportAction.exportXAR(ExportAction.java:264)
>
> How can I solve it?
>
> -----Mensaje original-----
> De: users-boun...@xwiki.org [mailto:users-boun...@xwiki.org] En nombre de 
> Thomas Mortagne
> Enviado el: jueves, 26 de marzo de 2009 9:49
> Para: XWiki Users
> Asunto: Re: [xwiki-users] Export from 1.7 and import in 1.8
>
> On Thu, Mar 26, 2009 at 09:44, Hernández Cuchí, Francisco Ricardo
> <francisco.hernan...@oepm.es> wrote:
>> You are right, I cannot open it (using 7zip). But I rememeber I was able to 
>> import earlier backups in other xwiki 1.7. ¿Is there any way to send all 
>> that I have in xwiki1.7 into 1.8? or to see what is corrupting the 
>> compressed file. Or to make a selective export of spaces?
>
> Looks like the issue is the export from 1.7 which produce corrupted
> xar in your case. Do you have any error/warning in the log when you
> try to export xar from 1.7 wiki ?
>
> If you want to do selective export you can use
> http://code.xwiki.org/xwiki/bin/view/Applications/ImportExportApplication
>
>>
>> Thanks,
>>
>> Francisco
>>
>>
>>
>> -----Mensaje original-----
>> De: users-boun...@xwiki.org [mailto:users-boun...@xwiki.org] En nombre de 
>> Thomas Mortagne
>> Enviado el: jueves, 26 de marzo de 2009 9:34
>> Para: XWiki Users
>> Asunto: Re: [xwiki-users] Export from 1.7 and import in 1.8
>>
>> Hi,
>>
>> Looks like your xar is invalid, are you able to open it (rename it to *.zip) 
>> ?
>>
>> On Wed, Mar 25, 2009 at 18:46, Hernández Cuchí, Francisco Ricardo
>> <francisco.hernan...@oepm.es> wrote:
>>> Want to show this from the console:
>>>
>>> "
>>>
>>> .XWikiAction                 - Uncaught exception: Error number 11015 in 
>>> 11: Exception while importing Wrapped Exception: Unexpected end of ZLIB 
>>> input stream com.xpn.xwiki.XWikiException: Error number 11015 in 11: 
>>> Exception while importin g
>>>
>>> Wrapped Exception: Unexpected end of ZLIB input stream
>>>
>>> ..."
>>>
>>>
>>>
>>> It's a file of 10 megs
>>>
>>>
>>>
>>> regards
>>>
>>> ________________________________
>>>
>>> De: Hernández Cuchí, Francisco Ricardo
>>> Enviado el: miércoles, 25 de marzo de 2009 17:38
>>> Para: 'XWiki Users'
>>> Asunto: Export from 1.7 and import in 1.8
>>>
>>>
>>>
>>> Hello everybody,
>>>
>>>
>>>
>>> I create an export xar from xwiki 1.7, and when i try to import i tinto 
>>> 1.8, I receive that there are no documents in the file. I receive the 
>>> message that there are no documents in the specified file.
>>>
>>>
>>>
>>> Any suggestion?
>>>
>>>
>>>
>>> Thanks in advance,
>>>
>>>
>>>
>>> Francisco
>>>
>>>
>>>
>>> --
>>>
>>> Francisco Hernández Cuchí
>>>
>>> Jefe de Servicios Sistemas de Información
>>>
>>> tlf: 913496844
>>>
>>> mail: francisco.hernan...@oepm.es <mailto:francisco.hernan...@oepm.es>
>>>
>>>
>>>
>>> **********************************************************************************************
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>>> http://lists.xwiki.org/mailman/listinfo/users
>>>
>>
>>
>>
>> --
>> Thomas Mortagne
>> _______________________________________________
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>
>
>
> --
> Thomas Mortagne
> _______________________________________________
> users mailing list
> users@xwiki.org
> http://lists.xwiki.org/mailman/listinfo/users
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-- 
Thomas Mortagne
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