Use GeneXus Java and PostgreSQL in 8 steps1. Install Sun JDK 1.4 or higher (http://java.sun.com/j2se/1.4.2/download.html)
2. Install PostgreSQL (version 7.4 or higher : http://www.postgresql.org/download/)
3. Install the JDBC driver (http://jdbc.postgresql.org/download.html)
4. Install pgAdmin (http://www.pgadmin.org/)
5. Execute pgAdmin and create a database, and a user.
6. Configure a GeneXus model with PostgreSQL as DBMS. In 'DBMS Options' configure 'JDBC driver' with the value 'PostgreSQL JDBC Driver (Type 4)', and set the properties about the server name, database name, user and password. In 'Execution Options' configure 'Sun SDK' in 'Platform', and add the JDBC .jar file to 'Classpath'.
7. Create the tables with GeneXus
8. Generate and compile you application