spring - How Authentication manager verifies Credentials? -


i using spring security in web application.

here have authentication-manager & authentication-provider providing authenticate user details directly or service.

like: 

 <authentication-manager>       <authentication-provider user-service-ref="loginservice" />    </authentication-manager>

how internally performing verifications. verification logic present ?

what going on internally ?

can suggest explanation.

spring security javadoc friend !

authenticationmanager interface. default implementation providermanager gets list of authenticationprovider. each authenticationprovider tried in sequence until 1 can decide authentication credentials proposed.

here, <authentication-provider user-service-ref="loginservice" /> declares daoauthenticationprovider. daoauthenticationprovider loads user information userdetailsservice (here loginservice) , compares username/password combination values supplied @ login. if fine, populates authenticationtoken values retrieved loginservice , passes id authenticationmanager. if credentials wrong, throws authenticationexception


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