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How to generate a token from username and password

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Last Modified: 2020-11-15
Hi,
What libraries are available to create a Token using the username and password ?
Its like when we are redirected to another site for login and we enter a username and password.there. The site redirects to the original site with some token.
How is this token generated.
Its like we see on several websites where the login is done through google etc.

I saw the
<dependency>
    <groupId>com.auth0</groupId>
    <artifactId>java-jwt</artifactId>
    <version>3.11.0</version>
</dependency>

The above library. But there seems to be no options of entering username and password.

Thanks
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