oauth 2.0 - How to decode the OAuth2 access token to get the username by Resteasy -

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i beginner use resteasy provide oauth2 service. much!

when use grant_type of client_crdentials,

1st step: requesting access token username , password. 2nd step: put access token authorization header call api.

my question is, @ 2nd step, @ server side, how decode access token username used request access token in 1st step? because, want know calling api. much!


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