config/src/main/java/org/springframework/security/config/annotation/web/configurers/ExceptionHandlingConfigurer.java
AuthenticationEntryPoint getAuthenticationEntryPoint(H http) {
		AuthenticationEntryPoint entryPoint = this.authenticationEntryPoint;
		if (entryPoint == null) {
			entryPoint = createDefaultEntryPoint(http);
		}
		return entryPoint;
	}
AuthenticationEntryPoint getAuthenticationEntryPoint(H http) {
		AuthenticationEntryPoint entryPoint = this.authenticationEntryPoint;
		if (entryPoint == null) {
			entryPoint = createDefaultEntryPoint(http);
		}
		return entryPoint;
	}
Gets the {@link AuthenticationEntryPoint} according to the rules specified by
{@link #authenticationEntryPoint(AuthenticationEntryPoint)}
@param http the {@link HttpSecurity} used to look up shared
{@link AuthenticationEntryPoint}
@return the {@link AuthenticationEntryPoint} to use