Hi, I am trying to upgrade my xwiki 3.0 installation to 4.0rc1. The database migration fails as follows: 2012-04-20 11:53:53,030 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - Running storage schema updates and migrations 2012-04-20 11:53:53,126 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - Current storage version = [15429] 2012-04-20 11:53:53,126 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - List of migrations that will be executed: 2012-04-20 11:53:53,126 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - R35100XWIKI7564 - See http://jira.xwiki.org/browse/XWIKI-7564 2012-04-20 11:53:53,126 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - R40000XWIKI6990 - Convert document IDs to use the new improved hash algorithm. 2012-04-20 11:53:53,126 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - R40001XWIKI7540 - See http://jira.xwiki.org/browse/XWIKI-7540 2012-04-20 11:53:57,430 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - 20 schema updates required. 2012-04-20 11:53:58,419 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - Successfully acquired change log lock 2012-04-20 11:53:58,570 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - Creating database history table with name: databasechangelog 2012-04-20 11:53:58,579 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - Reading from databasechangelog 2012-04-20 11:53:58,582 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - Reading from databasechangelog 2012-04-20 11:53:58,713 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-000::dgervalle ran successfully in 72ms 2012-04-20 11:53:58,749 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-001::dgervalle ran successfully in 17ms 2012-04-20 11:53:58,769 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-002::dgervalle ran successfully in 17ms 2012-04-20 11:53:58,785 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-003::dgervalle ran successfully in 12ms 2012-04-20 11:53:58,804 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-004::dgervalle ran successfully in 16ms 2012-04-20 11:53:58,815 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-005::dgervalle ran successfully in 8ms 2012-04-20 11:53:58,838 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-006::dgervalle ran successfully in 20ms 2012-04-20 11:53:58,866 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-007::dgervalle ran successfully in 25ms 2012-04-20 11:53:58,878 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-008::dgervalle ran successfully in 9ms 2012-04-20 11:53:58,888 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-009::dgervalle ran successfully in 7ms 2012-04-20 11:53:58,927 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-010::dgervalle ran successfully in 36ms 2012-04-20 11:53:59,027 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-011::dgervalle ran successfully in 97ms 2012-04-20 11:53:59,043 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-012::dgervalle ran successfully in 13ms 2012-04-20 11:53:59,055 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-013::dgervalle ran successfully in 9ms 2012-04-20 11:53:59,072 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-014::dgervalle ran successfully in 14ms 2012-04-20 11:53:59,083 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-015::dgervalle ran successfully in 8ms 2012-04-20 11:53:59,092 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-016::dgervalle ran successfully in 6ms 2012-04-20 11:53:59,103 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-017::dgervalle ran successfully in 8ms 2012-04-20 11:53:59,112 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-018::dgervalle ran successfully in 6ms 2012-04-20 11:53:59,123 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - ChangeSet liquibase.xml::R40000-019::dgervalle ran successfully in 9ms 2012-04-20 11:53:59,128 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO c.x.x.s.m.liquibase - Successfully released change log lock 2012-04-20 11:53:59,129 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - Running migration [R35100XWIKI7564] with version [35100] 2012-04-20 11:54:34,855 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - New storage version is now [35100] 2012-04-20 11:54:34,855 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - Running migration [R40000XWIKI6990] with version [40000] 2012-04-20 11:54:34,993 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Retrieved 1166 document IDs to be converted. 2012-04-20 11:54:35,173 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Retrieved 1593 object IDs to be converted. 2012-04-20 11:54:35,257 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Retrieved 3 custom mapped classes to be processed. 2012-04-20 11:54:35,263 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Retrieved 0 document statistics IDs to be converted. 2012-04-20 11:54:35,268 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Retrieved 0 referer statistics IDs to be converted. 2012-04-20 11:54:35,273 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Retrieved 0 visit statistics IDs to be converted. 2012-04-20 11:54:35,273 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Converting 1166 document IDs in 5 tables and 0 collection tables... 2012-04-20 11:54:38,449 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - All document IDs has been converted successfully. 2012-04-20 11:54:38,449 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO h.R40000XWIKI6990DataMigration - [R40000XWIKI6990] - Converting 1593 object IDs in 11 tables, 3 custom mapped tables and 3 collection tables... 2012-04-20 11:54:38,717 [http://xwiki.itris.nl/nwiki/bin/view/Main/] WARN o.h.u.JDBCExceptionReporter - SQL Error: 0, SQLState: 23503 2012-04-20 11:54:38,717 [http://xwiki.itris.nl/nwiki/bin/view/Main/] ERROR o.h.u.JDBCExceptionReporter - ERROR: insert or update on table "xwikilists" violates foreign key constraint "fkdf23086d283ee295" Detail: Key (xwl_id, xwl_name)=(-5504298284294640791, tags) is not present in table "xwikiproperties". 2012-04-20 11:54:38,718 [http://xwiki.itris.nl/nwiki/bin/view/Main/] WARN h.a.e.MultiTableUpdateExecutor - unable to drop temporary id table after use [ERROR: current transaction is aborted, commands ignored until end of transaction block] 2012-04-20 11:54:38,734 [http://xwiki.itris.nl/nwiki/bin/view/Main/] INFO .HibernateDataMigrationManager - Failed to migrate database [xwiki]... com.xpn.xwiki.store.migration.DataMigrationException: Data migration R40000XWIKI6990 failed I am running on a Posgresql 9.1 database.. Hope someone can help... Frits