XWiki schema cannot be updated in Oracle 11g

Installed 3.2 using the Windows installer - XWiki starts as expected using HSQLDB. Modified hibernate.cfg.xml to use Oracle (Oracle10gDialect), dropped ojdbc14.jar into directory XWIKI_HOME\WEB-INF\lib, modifed xwiki.cfg (xwiki.store.migration=1).

Starting the wiki generates the following error message:

2011-12-16 11:37:38,612 http://localhost:8080/xwiki/bin/view/Main/
ERROR .x.x.s.XWikiHibernateBaseStore - Failed updating schema while executing query [create table xwiki.feeds_aggregatorurl (agg_id number(10,0) not null,
agg_name long,
agg_url long,
agg_date timestamp,
agg_nb number(10,0),
primary key (agg_id))]
java.sql.SQLException: ORA-01754: a table may contain only one column of type LONG