A reader recently asked: Which web sites (if any) do you frequent to keep up with Java goings-on?
Hmm, that's a good question. Here are a couple you might want to check out.
I do a lot of my learning by reading books, so one of my very first blog postings was What You Should Be Reading. This is a theme that has come up a number of times in my blog, so Google for that. Likewise, check out a frequent recommendation of mine, the ISSW Recommended Reading List, which is mostly articles and web sites, not books, so that they're freely and immediately accessible.
The reader proposed one possibility for a good web site to learn about Java: The Server Side. I tend to find The Server Side to be kind of a super market tabloid of a Java news site; more interested in shocking than educating. There, I've said it, let the hate mail begin. (sigh) When I peruse The Server Side, what I find is lots of announcements for new versions of frameworks I've never heard of, which doesn't make me feel more knowledgeable about how to use Java. To anyone who wants to defend The Server Side: What would be useful is for you to highlight sections of the web site for learning about Java, and thereby prove what a good educational site it is; I'd like to know.
There are other Java web sites which tend to be educational and helpful. My collegue Kyle Brown publishes and comments occasionally on JavaRanch, which seems to actually have informative articles. Along the same lines, jGuru seems good. A performance-specific site is Java Performance Tuning; a similar site is Precise Java. (Also in the Google list of Java performance sites is one called Nawa Shibari, but judging from the root page, I'd say it seems to be something very different! Is this where Java performance enthusiasts go when they're not tuning Java?!)
OnJava is O'Reilly's take on things. Javalobby is kind of the closest thing Java has to a political action committee. And finally, at the risk of simply endorsing my own employer, there are lots of good articles in the developerWorks' zones on Java, WebSphere, WebSphere Application Server, IBM WebSphere Developer Technical Journal, Rational Application Developer (and the older WebSphere Studio zone), and so on.
That should give you some stuff to browse for a while. Hope you find it helpful.
Aug 23 Update:
Another helpful site is java.net, run by Sun as a newsie addition to the main Java Technology site.