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Greetings...

It's Java identity time again, and you know what that means: properly
implementing equals() and hashCode() in some way that is meaningful and
appropriate to your objects. That is, if they're to be considered the
same, then they'll return true for equals() and have equal hashCode()
values, so that a collection (particularly a Set, which doesn't allow
duplicates) will treat them appropriately. All well and good. Until you
bring persistence into the picture.

"Object identity is deceptively hard to implement correctly when objects
are persisted to a database. However, the problems stem entirely from
allowing objects to exist without an ID before they are saved. We can
solve these problems by taking the responsibility of assigning object IDs
away from object-relational mapping frameworks such as Hibernate." James
Brundege says the solution is to create your own unique ID as soon as the
object is instantiated, and to use that as the basis of object and
database identity. In "Don't Let Hibernate Steal Your Identity," he shows
how to accomplish this.

http://www.onjava.com/pub/a/onjava/2006/09/13/dont-let-hibernate-steal-your-identity.html

Lost in Eclipse? Cheat. "Eclipse provides a built-in mechanism for
displaying mini-tutorials called cheat sheets. Cheat sheets are quick and
dirty instructions for how to perform multi-step processes in Eclipse,
displayed on the side of the workbench where you can quickly and easily
step through them." In "Building Cheat Sheets in Eclipse," Harriett
Hardman and Steve Hanson show you how to create your own.

http://dev2dev.bea.com/pub/a/2006/08/eclipse-cheat-sheets.html

In this week's feature article from java.net, Srivaths Sankaran takes a
look at the how, where, when, and why of "Code Reviews": "A code review is
an excellent checkpoint that can help flush out erroneous assumptions and
gaps in reasoning. It helps minimize the impact of a problem by means of
early detection. While testing is an excellent way to improve the quality,
testing alone is not enough. For one, as shown by McConnell in 'Code
Complete', it is statistically impossible to completely test a nontrivial
software project. Testing must be bolstered by up-front code reviews."

http://today.java.net/pub/a/today/2006/08/17/code-reviews.html

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

Shashank Tiwari - REST for Java
http://www.oreillynet.com/onjava/blog/2006/09/rest_for_java.html

Timothy M. O'Brien - Charles Nutter Responds: "Our full-time
responsibility is a solid JRuby 1.0"
http://www.oreillynet.com/onjava/blog/2006/09/charles_nutter_responds_our_fu.html

Timothy M. O'Brien - Sun hires JRuby Developers (to focus on developer tools?)
http://www.oreillynet.com/onjava/blog/2006/09/sun_hires_jruby_developers.html

Robert Cooper - I don't care how big the JRE is
http://www.oreillynet.com/onjava/blog/2006/09/i_dont_care_how_big_the_jre_is.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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