A valid Kodo license key. Evaluation keys are available at http://www.solarmetric.com/Software/Evaluate. To purchase a key, go to http://www.solarmetric.com/Software/Purchase.

JDK 1.5 or greater for EJB Persistence; JDK 1.2 or greater for JDO.

A relational database with JDBC driver, such as Oracle, IBM DB2, Microsoft SQLServer, Sybase, Pointbase, MySQL, PostgreSQL, or Hypersonic SQL. This installation is bundled with Hypersonic, which requires no installation and minimal configuration.