From the JDBCMetaDataDialect source code, I suppose this still occurs on Hibernate-Tools 4.0.0.CR1, see http://grepcode.com/file/repo1.maven.org/maven2/org.hibernate/hibernate-tools/4.0.0-CR1/org/hibernate/cfg/reveng/dialect/JDBCMetaDataDialect.java/
So there is no fix.
I patched my Hibernate-Tools as described in my latest post on february 20 2009 and that still did the job, almost 4 year after.