How does ActiveDirectoryLdapAuthenticationProvider work without explicitly specifying user credentials?

Following is a typical example of what I've found on the Internet for Authenticating to Active Directory using LDAP.

package com.test; import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder; import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity; import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter; import org.springframework.security.ldap.authentication.ad.ActiveDirectoryLdapAuthenticationProvider; @EnableWebSecurity public class WebSecurityConfig extends WebSecurityConfigurerAdapter { @Override protected void configure(AuthenticationManagerBuilder auth) throws Exception { ActiveDirectoryLdapAuthenticationProvider adProvider = new ActiveDirectoryLdapAuthenticationProvider("domain.org", "ldap://activedirectory-url:389"); adProvider.setConvertSubErrorCodesToExceptions(true); adProvider.setUseAuthenticationRequestCredentials(true); auth.authenticationProvider(adProvider); } } 

Let's say I have a user XYZ with password 123 which I enter into the login form. How would this security configuration pickup my credentials and verify them against the Active Directory server?

Why does Active Directory not require a ManagerDn, ManagerPassword, or Username or Userpassword. I fail to understand how it would Authenticate without the aforementioned information.

Normally with ldapAuthentication I would provide such details in the ContextSource, like so:

but I can't seem to find how do this with ActiveDirectoryLdapAuthenticationProvider .

I checked the class's documentation and was unable to understand how it receives and processes the userCredentials

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