How quickly does a language get outdated?

Posted by Dummy Derp on Programmers See other posts from Programmers or by Dummy Derp
Published on 2012-08-29T13:16:26Z Indexed on 2012/08/30 9:50 UTC
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Development

I started learning Java recently. I started learning it using books that I picked up from the library, some that I bought, and here and there from Java documentation.
The book that I use for Java was published in the year 2011. In 2012, Java8 will be released followed by Java9 in the year 2013.
The questions are:

How do I keep myself updated about developments in Java without having to buy a tome for Java8 and/or Java9
Is a book published in 2008 an outdated book for studying JSP and Servelets? I'm talking about Head First Servlets and JSP

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