Postgres9
From Projectivity Documentation
In order to user Postgres 9 you need to update the JDBC driver shipped with projectivity. Proceed as follows:
- remove the old driver from the server lib directory. the file to remove is <PYDIR>/server/projectivity/lib/postgresql-8.3-603.jdbc3.jar
- download the PostgresSQL JDBC driver that suits your configuration from http://jdbc.postgresql.org/download.html
- copy the downloaded jar (currently postgresql-9.0-801.jdbc4.jar) to <PYDIR>/server/projectivity/lib/
- restart Projectivity if it was running
- enjoy:)

