OpenDJ software depends on the Java environment more than it depends on the underlying operating systems. OpenDJ directory server relies on Java 6, specifically at least the Java Standard Edition 6.0 (Sun version 1.6.0_10) runtime environment. For best server performance, use at least version 1.6.0_22, which includes a major security fix for TLS as well. To build applications with the OpenDJ LDAP SDK, you need the Java SDK as the runtime environment has no compiler. That said, OpenDJ has been validated on the following operating systems. Apple Mac OS X 10.7 Linux 2.6 Microsoft Windows Server 2008 Oracle Solaris 10 OpenDJ DSML gateway has been validated on Apache Tomcat 6.