How to use java as a backend?

I recently came to know that JAVA can be used as a backend. Can anyone explain the concept of the same?
Thank You !!!=D>

What? How is anything used as a backend? Backend for what? This is a non-question.

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JAVA can be used as a backend

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Anything can be used as a 'backend'. You could write some PHP that produced XML/JSON responses to requests for calculations, and that would be a 'compute backend' for another site that collected user input and presented the results.

@KevinWorkman: By backend i mean where you store your data, just like what we do in sql or other databases.

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Originally Posted by gpraveen

@KevinWorkman: By backend i mean where you store your data, just like what we do in sql or other databases.

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There are databases out there written in java, for example Apache Derby. I suggest you write a more clear question and description of what you want to do if you want a more detailed answer

How to use java as a backend?

Double posting bastage.

BTW I use my backend as a backend. It is quite comfortable.