Hi Sergiu,
I just did that, running on Tomcat 5.5 against a MySQL 5.0.21 server.
I loaded the database dump from the old xwiki app.
Unfortunately, still the same error, see below.
Thanks for your response,
- Lukas
-----------------------------------------------------------------------
com.xpn.xwiki.XWikiException: Error number 3 in 0: Could not initialize
main XWiki context
Wrapped Exception: Error number 3201 in 3: Exception while saving
document XWiki.XWikiPreferences
Wrapped Exception: Could not execute JDBC batch update
        com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:266)
        com.xpn.xwiki.XWiki.getXWiki(XWiki.java:346)
        com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:96)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121)
Sergiu Dumitriu wrote:
  Hi,
 The 4.0 version is not recommended (supported) anymore. Among other
 things, the hibernate version we use causes a deadlock, and character
 sets are not supported.
 I think this was specified somewhere on the wiki...
 However, the update should not be a problem. Please try to update using
 a newer version of mysql, and tell us if it works, so that we can update
 the installation instructions to emphasize this issue.
 Sergiu Dumitriu, developer.
 On 2/1/07, *teh stu* <stukas14(a)gmx.net <mailto:stukas14@gmx.net>> wrote:
     OK, thanks!
     Is there a chance that a developer will respond on this list?
     Or.. maybe you are, I don't know.. :)
     But it seems to me nobody knows how to do this properly.
     Do you know who might know?
     Thanks,
     - Lukas
     Fabian Gorsler wrote:
  Hi Lukas,
 On Do, 2007-02-01 at 15:18 +0100, teh stu wrote:
  I'm using MySQL 4.0.22 on Windows. 
 it seems you're usign InnoDB tables which handle references 
     correctly.
  But I don't know much about MySQL. In fact
the only thing I know about
 MySQL which is interesting in this situation, that only InnoDB serves
 referential integrity.
> Do you think it could help to try the new XWiki on a MySQL 5 
     server ?
 AFAIK the update works with MySQL 5, but I'm not sure. Until 
     yesterday I
  did read much mails on this list.
> I didn't quite follow you about the referential integrity 
     problems in
 > dumps. Is it something than can perhaps be
fixed manually or with 
     a script?
 While the database layout from 0.9.840 is updated to the new layout of
 1.0b3 there seem to be some data sets which are referenced in other
 tables and because of that the new layout can't be applied.
 Perhaps it is possible to do the update when those data sets are
 deleted, but I don't know whether these data sets are only of 
     temporary
  interest (session stuff, locks, ...) or if they
are needed 
     permanently.
  If they are needed, deleting them would be
harmful.
 Best regards,
 Fabian.
 
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