The standard Java APIs for Oracle Internet Directory are available as the Java Naming and Directory Interface (JNDI) from Sun Microsystems. The JNDI is found at this link:
http://java.sun.com/products/jndi
The Oracle extensions to the standard APIs are found in Oracle Fusion Middleware Java API Reference for Oracle Internet Directory.
Sample code for the Java APIs is available at this URL:
http://www.oracle.com/technology/sample_code/
Look for the Oracle Identity Management link under Sample Applications–Oracle Application Server.