Hi again, I have tried upgrading with the most recent release (4.1.3) and seem to have a successful upgrade. However there are issues in the logs (full stack attached [1]), which make me think there may be issues with the installation in the end. So my DB name is "xwiki_utf8_innodb_413". 1. 2012-07-14 23:56:15,392 [http://localhost/xwiki/bin/view/Main/WebHome] WARN o.i.c.InfinispanConfiguration - ISPN000139: Infinispan configuration schema could not be resolved locally nor fetched from URL. Local path=null, schema path=schema/infinispan-config-5.1.xsd, schema URL=http://www.infinispan.org/schemas/infinispan-config-5.1.xsd I believe schema will be created automatically and this error can be ignored, correct? 2. 2012-07-14 23:56:18,251 [http://localhost/xwiki/bin/view/Main/WebHome] WARN h.R40001XWIKI7540DataMigration - Skipping database [xwiki] because it uses a custom annotation class. Comments and anotations will remain separated This one is really weird because my db name is "xwiki_utf8_innodb_413" (and as you'll see in the logs the rest of upgrade items refer to name "xwiki_utf8_innodb_413". More over I'd really like to use merged comments and annotations feature. What should I fix in order to merge comments and annotations? 3. Then there's a bunch of info messages following next pattern 2012-07-14 23:56:35,897 [http://localhost/xwiki/bin/view/Main/WebHome] INFO c.x.x.s.m.liquibase - Change set liquibase.xml::R40000-000::sdumitriu failed, this error could be safely ignored until something worse happens. Error: Error executing SQL ALTER TABLE `$table_name$` DROP FOREIGN KEY `$FOREING_KEY_ID$`: Error on rename of './xwiki_utf8_innodb_413/$table_name$' to './xwiki_utf8_innodb_413/#sql2-dfb-c08f' (errno: 152) Where $table_name$ = {xwikiintegers, xwikistrings, xwikifloats, xwikidoubles, xwikilistitems, xwikidates, xwikilargestrings, xwikilists, xwikilongs, feeds_feedentrytags, feeds_aggregatorurlgroups} Even though the message says "safely ignore", I tend not to trust it when I see words "failed" and "something worse might happen", because in IT it does happen. So again how can I fix this message? 4. And finally there's a bunch of deprecated methods used in the end: method [com.xpn.xwiki.api.Util.parseInt] in unknown namespace@68,26 getter [com.xpn.xwiki.api.Util.getArrayList] in unknown namespace@788,35 method [com.xpn.xwiki.api.Util.parseInt] in unknown namespace@68,26 getter [com.xpn.xwiki.api.Util.getArrayList] in unknown namespace@788,35 Can they be fixed? 5. Also one more question: after this serious migration, is there a way to find out that my database and application has a valid state? (I mean some other way than just start using and find an error after 2-3 weeks of adding pages, to find out that it wont be able to either downgrade or fix the issue) [1] Full upgrade logs attached: http://xwiki.475771.n2.nabble.com/file/n7580357/db-migration.log db-migration.log -- View this message in context: http://xwiki.475771.n2.nabble.com/Possible-upgrade-3-5-1-to-4-0-issue-tp7528... Sent from the XWiki- Users mailing list archive at Nabble.com.