latest versions of jsp2.1, 2.0 different from jsp 1.2


How latest versions of jsp2.1, 2.0 different from jsp 1.2. How the Expression language is handled differenly in these versions. what are additional features of later versions.

I did not use later versions.
any good site to look for basic and advanced custom tag examples. I am not having complete clear picture on the jsp custom tags.

Please advise. Any ideas, sample code, resources highly appreciated. Thanks in advance
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You can find a summary of new features of JSP 2.1 here.

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