Hi Dmitry,

our DB is not really huge. It was enough to rise the mysql package size to
64M ;)

Renaming the sub-wiki to "xwiki" didn't worked for me. I've got this
StackOverflow:


java.lang.StackOverflowError: null
        at java.util.regex.Pattern$Slice.match(Pattern.java:3496)
~[na:1.6.0_18]
        at java.util.regex.Pattern$Start.match(Pattern.java:3072)
~[na:1.6.0_18]
        at java.util.regex.Matcher.search(Matcher.java:1116) ~[na:1.6.0_18]
        at java.util.regex.Matcher.find(Matcher.java:552) ~[na:1.6.0_18]
        at java.util.regex.Matcher.replaceAll(Matcher.java:819)
~[na:1.6.0_18]
        at java.lang.String.replace(String.java:2219) ~[na:1.6.0_18]
        at
org.xwiki.model.internal.reference.DefaultStringEntityReferenceSerializer.serializeEntityReference(DefaultStringEntityReferenceSerializer.java:65)
~[xwiki-platform-model-4.4.jar:na]
        at
org.xwiki.model.internal.reference.AbstractStringEntityReferenceSerializer.serialize(AbstractStringEntityReferenceSerializer.java:44)
~[xwiki-platform-model-4.4.jar:na]
        at
org.xwiki.model.internal.reference.AbstractStringEntityReferenceSerializer.serialize(AbstractStringEntityReferenceSerializer.java:32)
~[xwiki-platform-model-4.4.jar:na]
        at
com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl.checkRight(XWikiRightServiceImpl.java:326)
~[xwiki-platform-legacy-oldcore-4.4.jar:na]
        at
com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl.checkRight(XWikiRightServiceImpl.java:442)
~[xwiki-platform-legacy-oldcore-4.4.jar:na]


I figured it out that the XWiki.XWikiAllGroup caused the problem. Maybe some
rights or users from the main wiki, i'm not sure about that.


But yes, XEM is nice to manage multiple wikis, and our project will benefit
of XEM. But we have some serve problems with XEM: see this thread:
http://xwiki.475771.n2.nabble.com/severe-trouble-with-web-crawlers-tp7442162.html

Currently im working with partial space exports / imports. But its hard to
get only the pages which not leave  the xwiki in a unrecoverable state (with
the exception).

Greetings

Jan



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