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Please suggest good book/website to for Threads and Concurrency? [closed]

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I have gone through Head First Java and some other sites but I couldn't find complete stuff related to Threads and additional concurrency packages at one place.
Please suggest a book/website which covers complete Threads with more details like
Synchronize and locking of objects
More detailed about volatile
Visibility issues in Threads
java.util.concurrent package
java.util.concurrent.atomic package

The must-read book about concurrent programming in Java is Java Concurrency in Practice.
Also see Concurrency in Sun's Java Tutorials.

You might find the Java Concurrency Refcard a useful aid along with Java Concurrency in Practice.

Java Concurrency in Practice is great for coverage of the higher-level stuff in java.util.Concurrent, but if you want the authoritative answers on synchronized and volatile, you need to go to the source. No, not the source code, that would be insane. I mean the spec: Java Language Specification, Third Edition — Chapter 17: Threads and Locks
Or if you want it in book form: The Java™ Language Specification (3rd Edition)

Java Threads is another good one :)

What is the best place to find software development conference listings? [closed]

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I am interested in an array of software ideas and use more than one language, is there somewhere that concisely lists software development conferences year by year? I'd like to know what options are out there for this year and searching by ideology/language isn't practical in my opinion to get an overall.
Some ideologies/languages that interest me (but open to others):
TDD (with various languages, not just Java)
Agile (w/Scrum, Kanban)
Java
C++
.NET/C#
Development Tools (IDE, Debuggers, etc...)

Not a listing but I use http://www.infoq.com/ to watch videos of past conferences.

ConfRadar is a really nice to tool to find out about conferences. I am sure you'll find what you are looking for.

Just a list of conferences which I see useful http://lanyrd.com/topics/software-development/

Plancast just launched an O'Reilly section. Not exactly what you're looking for, but might be useful.
http://plancast.com/oreilly

Book to walk you through java APIs? [closed]

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I saw this post :
https://stackoverflow.com/questions/441198/has-anyone-learned-how-to-program-in-21-days/441224#441224
and I'm not familiar with java APIs, which books do you think will really help me get familiar with those APIs?

Java in a Nutshell, David Flanagan

Java has lots of APIs! Which ones are you interested in becoming familiar with?
What's nice, though, is that Javadocs tend to make APIs easy to learn, by providing method signatures and short descriptions.
Many APIs also have more in-depth tutorials online that you can read. In many cases this can be easier / more accessible / cheaper than buying books.
I would start off with Java Collections, as they are used in most Java applications: http://java.sun.com/docs/books/tutorial/collections/index.html
Note that this is one of Sun's "Trail" tutorials, which are very helpful. Check out the others as well, for those libraries that you are interested in learning. Here is the main index: http://java.sun.com/docs/books/tutorial/index.html

Effective Java by Josh Bloch

You should really start at http://java.sun.com/docs/books/tutorial/index.html
These tutorials are well written, and will get you up to speed quickly. For all the details, go to the documentation at http://java.sun.com/javase/6/docs/api/
If you insist on a book, Thinking in Java by Eckel is not bad, though Eckel can be a bit longwinded and obtuse.

Java Cookbook contains examples to many API's
Then javadoc can be used to adapt to own requirements.

Java 7- complete reference This books not out yet but it might help a lot along with the java docs and all the additional material the others have mentioned.

Where can I get started learning about Rule Engines? [closed]

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I'm currently designing a Java application where a Rule engine could be useful. Where is a good place I can learn about how to use them, how they work, how to implement them, see samples, etc.?

The Drools documentation includes a lot of useful, general purpose information. Especially chapter 2, which covers rule engine basics, knowledge representation, etc. It also includes a nice recommended reading list for coming up to speed on rule engines and expert systems.
For most rule engines, a basic understanding of the rete algorithm usually comes in handy for writing efficient rules. I have personally found the Doorenbos paper referenced in the Wikipedia article to be the clearest technical explanation.
Also, here is a list of open source rule engines in Java.

You might want to read "Should I use a Rules Engine?" from Martin Fowler's blog.
I have worked on a project where we built our own (very simple) rules engine, with the intention to move to a general rule engine when things got too complicated. Never reached that point though, the system has been running happily with the simple homegrown engine for several years now.

I found this site pretty helpful. Are you looking at building your own, or using a 3rd party library?

best (or at least good) guide to Java annotations [closed]

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There must be a good book/PDF/HTML file that describes the essentials & good practices of annotations in Java. I sort of know what they are from other good Java books, but I'm looking for something that would teach me most of what I would need to know to make good use of them. (preferably in PDF/HTML so I can print it out & read at my leisure, book ok also but those go out of date so fast...)
Any recommendations?
edit: I found the Sun guides, as well as tutorials like these from O'Reilly and DevX, and the section of Effective Java that covers them... OK, so I know what they are and what tools to read them, but that doesn't tell me much about how they are put to use in practice. (other than a little bit in Effective Java and the O'Reilly article above that suggest their use in automated testing frameworks)

Some opinions on annotations:
http://web.archive.org/web/20120115164115/http://faler.wordpress.com/2007/11/21/when-to-use-and-not-to-use-java-annotations
This guy is very much against them:
https://web.archive.org/web/20060702222249/http://www.softwarereality.com/programming/annotations.jsp
Best Practices: http://willcode4beer.com/opinion.jsp?set=annotations_gotchas_best_practices
Hope this helps. Let us know what you find.