There are many books on the market describing Oracle and the Web. I list here those titles I find the most helpful and accurate:
Ken Arnold, James Gosling, 1997 Addison-Wesley, The Java Programming Language Coauthored by the creator of Java, this valuable introduction explains much of the rationale behind the language.
Bradley D. Brown, Richard J. Niemiec, Joseph C. Trezzo, 1998 Oracle Press, Oracle Application Server Web Toolkit Reference This large book contains a lot of helpful information about OAS and Oracle's other web products.
LLC Dynamic Information Systems, 1997 Oracle Press, Oracle Web Application Server Handbook This book is not current with the latest Oracle software, but it contains useful discussions of building web systems with PL/SQL and other tools.
Bruce Eckel, 1998 Prentice Hall Computer Books, Thinking in Java A popular and comprehensive introduction to Java that doesn't pull any punches when it comes to criticizing aspects of the language that could be improved.
Steven Feuerstein, Bill Pribyl, 1997 O'Reilly & Associates, Oracle PL/SQL Programming, Second Edition Hands down, the definitive guide to PL/SQL: if you need information about PL/SQL, it's in this book. The second edition has been updated for Oracle8.
Steven Feuerstein, 1999 O'Reilly & Associates, Oracle PL/SQL Programming: Guide to Oracle8i Features This small book supplements Oracle PL/SQL Programming by providing an up-to-date discussion of the Oracle8i enhancements to PL/SQL.
Feuerstein Steven, Charles Dye, John Beresniewicz, 1998 O'Reilly & Associates, Oracle Built-in Packages The follow-up volume to Oracle PL/SQL Programming. Presents detailed information about the vast array of packages built into the Oracle database.
David Flanagan, 1997 O'Reilly & Associates, Java in a Nutshell, Second Edition Provides a compact reference to the classes, methods, and variables in the Java API, practical real-world example programs, and a comprehensive overview of Java.
Rick Greenwald, 1999 IDG Books Worldwide, Oracle WebDB Bible A very current and complete discussion of Oracle's WebDB product.
Chuck Musciano, Bill Kennedy, 1999 O'Reilly & Associates, HTML: The Definitive Guide, Third Edition The most thorough description of all aspects of the HTML language, including models for writing your own web pages.
Louis Rosenfeld, Peter Morville, 1998 O'Reilly & Associates, Information Architecture for the World Wide Web Describes architectural principles for web sites: how to design web sites that are easier to use, manage, and expand.
John E. Simpson, 1998 Prentice Hall Computer Books, Just XML A breezy tone and simple style belies the wealth of information contained in this useful book. Bonus: you'll learn as much about B movie trivia as you will about Extensible Markup Language.
Lincoln D. Stein, 1995 Addison Wesley, How to Set Up and Maintain a World Wide Web Site An excellent, clear, and complete book on installing and administering web servers and authoring in HTML, with a web page style guide and web security recommendations.
Marlene Theriault, William Heney, 1998 O'Reilly & Associates, Oracle Security The definitive source of information on security and its implementation in the Oracle environment.