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Greetings...

Document management is a popular high-level requirement for various kinds
of systems, and if you had to do such a thing from scratch, you might
initially think to just use files or a database. And that would be just
fine until you had to track every version of every document, and make
those versions retrievable. OK, so maybe you create more tables to match
versions to CLOBs, or just hand the whole thing over to Subversion and tie
into it with JavaSVN, as suggested by an ONJava article from back in May.
But did you think feature creep was over? Nope, now imagine that you to
take an action each time a document is revised, which implies that you now
need an observer system for your repository. Maybe it's time to stop and
let an advanced content repository take over the grunt-work for you. May I
suggest Apache Jackrabbit?

Following up on last month's "What Is Java Content Repository," Sunil
Patil's new article "Advanced Java Content Repository API" looks at some
of the advanced features standardized by JSR-170. "This article is a
step-by-step guide on how to develop your application using two of the
most popular optional features defined in JSR-170. We will start our
discussion with versioning, and then follow with observation, which lets
you execute some business logic when a particular persistent change is
made in the repository."

http://www.onjava.com/pub/a/onjava/2006/11/08/advanced-java-content-repository.html

Your web service may need to be public, but the contents of each call to
it probably shouldn't be. For those using WebLogic, Mamoon Yunus and Rick
White have written a dev2dev article on "Getting Started with
Message-Level Encryption on WebLogic Server 9.2." "The power of
interoperable and granular message-level encryption is now available to
ensure that data privacy is enforced beyond transport protocols. Within a
SOA, privacy-related policies can now be tested and enforced at the
message level, ensuring that, regardless of the transport security,
information is protected from intentional or inadvertent leaks."

http://dev2dev.bea.com/pub/a/2006/10/message-level-encryption.html

This week's feature article from java.net is on "Invoking Assembly
Language Programs from Java". Biswajit Sarkar writes, "Although,
theoretically speaking, JNI does provide a fairly generalized interface,
the support structure that comes with JNI is basically aimed at linking
C/C++ code with Java code. The literature that is available also appears
to deal exclusively with the methodology of linking Java and C/C++ [...]
For a developer using assembly language, it is necessary to understand
clearly how JNI exposes the interfaces."

http://today.java.net/pub/a/today/2006/10/19/invoking-assembly-language-from-java.html

Recent O'Reilly Network weblogs of interest to Java developers:

Robert Cooper - Java GPLed?
http://www.oreillynet.com/onjava/blog/2006/11/java_gpled.html

Paul Browne - SQL programs are the cockroaches of the IT world
http://www.oreillynet.com/onjava/blog/2006/11/sql_programs_are_the_cockroach.html

Robert Cooper - A prayer to the (demi-)gods of URI
http://www.oreillynet.com/onjava/blog/2006/11/a_prayer_to_the_demigods_of_ur.html

Paul Browne - Agile Architecture
http://www.oreillynet.com/onjava/blog/2006/11/agile_architecture.html

Dejan Bosanac - Retrotranslator
http://www.oreillynet.com/onjava/blog/2006/11/retrotranslator.html

Check out more O'Reilly Network Java weblogs at:
http://www.oreillynet.com/onjava/blog/


Please join us again next week.

Chris Adamson, Editor
ONJava.com
cadamson@oreilly.com

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