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Sorry if this is a duplicated question (at least I haven't found it yet). I found a question which answer is well covered in the tag info example (it includes a good explanation as well). I just pointed out this but do not know how to vote it to close including the link since it can't be considered as duplicate question.

Question in fact: How do you create a simple user validation java filter?

Tag info which resolves the problem: (to be precise, this is covered in the Hello world example).

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Sometimes I wish we had an obvious-answer close reason. But hey, you can answer it for free rep! – Emrakul Apr 10 '13 at 22:15
up vote 1 down vote accepted

You can relate as duplicate only to other questions, not wikis, answers or anything else.

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Correct. Which is why I don't advocate putting General Reference information directly into a tag wiki, but linking to a canonical reference question instead. – Robert Harvey Apr 10 '13 at 23:15

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