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Auto submissions protection for HTML forms

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Hello there,

I need to develop Web application (I am using Spring for it) and I do need to have this nice feature for bunch of HTML forms which prevents auto submissions.

I mean I need this like question "type number which you see on the image", and it will not allow you to submit with properly typed image.

So the question is -- is there are any specific separate open source framework for this feauture, or may be Spring already has some kind of plugin for it?

Any advice will be helpful!!! Thanks!
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Posts: 15304
Mac OS X IntelliJ IDE Chrome
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What you are looking for is what is called Captcha. There are a few Java captcha API's out there.

Here is one. I just grabbed the first hit off of googling for "java captcha" (without quotes). There were about 2 million results.
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