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http://jira.xwiki.org/jira/browse/XWIKI-1677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_18088
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Sergiu Dumitriu commented on XWIKI-1677:
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Types of exceptions:
- All threads busy => Too many requests at a time
- Cannot load property "allow" for some users, a different object with the same
identifier already associated with the session => problems with the database,
some junk in it
- Cannot load attachment conent: some images from the farm.xwiki.com site are
missing
- No data for property X of object Y: some missing properties, probably some
properties added to a class, and some old objects don't have these properties;
or the database lost some rows
- ArrayIndexOutOfBouds exceptions thrown inside radeox: These ones don't make
any sense... The code is something like: size = patterns.size(); for(i < size)
p = patterns.get(i), which should never fail. This causes a large part of the
errors.
- Duplicate entry for key NNN => Hash collision?
- Cannot create URLFactory => This is the root of another great part of the
exceptions, and is caused by the fact that either the class wasn't properly
init()-ed, or context.getMode() returns a strange value. The first variant is
very unlikely, as the code one level up in the stack trace just called init().
Unless there's a strange error in the memory, causing all maps and lists to
fail, there really is no explanation. Is that a special kind of request? When
is the stack trace generated?
There are other types of errors, but I didn't have time to look at all of them.
Except the database problems and the impossible errors, there's nothing serious
in there.
> A lot of exceptions while upgrading from XWiki 1.1M3 to 1.1RC1
> --------------------------------------------------------------
>
> Key: XWIKI-1677
> URL: http://jira.xwiki.org/jira/browse/XWIKI-1677
> Project: XWiki Platform
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.1 RC1
> Reporter: Raffaello Pelagalli
> Fix For: 1.1 RC2
>
> Attachments: logs.bz2
>
>
> A lot of exceptions while upgrading from XWiki 1.1M3 to 1.1RC1
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