config/src/main/java/org/springframework/security/config/annotation/web/configuration/WebSecurityConfigurerAdapter.java
protected AuthenticationManager authenticationManager() throws Exception {
		if (!authenticationManagerInitialized) {
			configure(localConfigureAuthenticationBldr);
			if (disableLocalConfigureAuthenticationBldr) {
				authenticationManager = authenticationConfiguration
						.getAuthenticationManager();
			}
			else {
				authenticationManager = localConfigureAuthenticationBldr.build();
			}
			authenticationManagerInitialized = true;
		}
		return authenticationManager;
	}
protected AuthenticationManager authenticationManager() throws Exception {
		if (!authenticationManagerInitialized) {
			configure(localConfigureAuthenticationBldr);
			if (disableLocalConfigureAuthenticationBldr) {
				authenticationManager = authenticationConfiguration
						.getAuthenticationManager();
			}
			else {
				authenticationManager = localConfigureAuthenticationBldr.build();
			}
			authenticationManagerInitialized = true;
		}
		return authenticationManager;
	}
protected AuthenticationManager authenticationManager ( ) throws Exception { if ( ! authenticationManagerInitialized ) { configure ( localConfigureAuthenticationBldr ) ; if ( disableLocalConfigureAuthenticationBldr ) { authenticationManager = authenticationConfiguration . getAuthenticationManager ( ) ; } else { authenticationManager = localConfigureAuthenticationBldr . build ( ) ; } authenticationManagerInitialized = true ; } return authenticationManager ; }
Gets the {@link AuthenticationManager} to use. The default strategy is if
{@link #configure(AuthenticationManagerBuilder)} method is overridden to use the
{@link AuthenticationManagerBuilder} that was passed in. Otherwise, autowire the
{@link AuthenticationManager} by type.

@return the {@link AuthenticationManager} to use
@throws Exception
Gets the { @link AuthenticationManager } to use . The default strategy is if { @link #configure ( AuthenticationManagerBuilder ) } method is overridden to use the { @link AuthenticationManagerBuilder } that was passed in . Otherwise autowire the { @link AuthenticationManager } by type .