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Greetings...
What would you do if you threw more memory and CPU's into a server and it
didn't get meaningfully faster? Myself, I'd probably assume that the
install was botched and try again, or consider the possibility that the
components were defective. I doubt it would occur to me that they were
all working and that what was slowing down my application was not the
hardware, nor my application, but the application server. And yet...
In "Software Infrastructure Bottlenecks in J2EE," Deepak Goel shows that
it is possible for an application server, with its many duties (data
persistence, object pooling, request handling, etc.) and the
synchronization of all of them, can itself become a performance
bottleneck. He shows statistics of what it looks like when systems become
bogged down in this way and discovers that depending on the situation, the
best way out might be a cluster on the same box and, if not, then a
cluster across multiple new boxes.
http://www.onjava.com/pub/a/onjava/2005/01/19/j2ee-bottlenecks.html
As expected, more uses for J2SE 5.0's Annotations are being discovered.
In "Validating Objects Through Metadata," Jacob Hookom shows how he used
annotation to provide validation to method calls in his
application--attributes indicate which methods are to be validated and in
what way, and reflection code picks up these attributes and implements
them at runtime.
http://www.onjava.com/pub/a/onjava/2005/01/19/metadata_validation.html
Cocoa applications for Mac OS X are typically written in Objective-C, but
they can also be written in Java. A "Cocoa-Java" bridge allows you to
call into the Cocoa classes from Java, while still allowing you to use the
rest of the J2SE API. In "Build an eDoc Reader for Your iPod, Part 3,"
Matthew Russell employs this combination to use an open-source PDF reader
written in Java and tie it in to his otherwise-native Mac application.
His article shows both how to use key classes in the bridge and how to use
the XCode IDE to set up a Cocoa-Java project.
http://www.macdevcenter.com/pub/a/mac/2005/01/07/ipod_reader.html
In our feature article from java.net, Thomas Kuenneth looks at J2ME's
persistence mechanism in "Mobile Memories: The MIDP Record Management
System." With portable devices like mobile phones offering such a
different environment, metaphors like J2SE's java.io.File don't
necessarily make sense in J2ME. So it offers a "Record Management
System," which works with uniquely indexed records that can be added,
updated, retrieved, and deleted.
http://today.java.net/pub/a/today/2004/11/16/J2ME-3.html
Please join us again next week.
Chris Adamson, editor
ONJava.com
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Safari Bookshelf has expanded its services to members of the java.net
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