core/src/main/java/org/springframework/security/authentication/ProviderManager.java
private void copyDetails(Authentication source, Authentication dest) {
		if ((dest instanceof AbstractAuthenticationToken) && (dest.getDetails() == null)) {
			AbstractAuthenticationToken token = (AbstractAuthenticationToken) dest;

			token.setDetails(source.getDetails());
		}
	}
private void copyDetails(Authentication source, Authentication dest) {
		if ((dest instanceof AbstractAuthenticationToken) && (dest.getDetails() == null)) {
			AbstractAuthenticationToken token = (AbstractAuthenticationToken) dest;

			token.setDetails(source.getDetails());
		}
	}
private void copyDetails ( Authentication source , Authentication dest ) { if ( ( dest instanceof AbstractAuthenticationToken ) && ( dest . getDetails ( ) == null ) ) { AbstractAuthenticationToken token = ( AbstractAuthenticationToken ) dest ; token . setDetails ( source . getDetails ( ) ) ; } }
Copies the authentication details from a source Authentication object to a
destination one, provided the latter does not already have one set.

@param source source authentication
@param dest the destination authentication object
Copies the authentication details from a source Authentication object to a destination one provided the latter does not already have one set .