Merge pull request #28361 from bartoszJaszczak

* gh-28361:
  Polish "Make UserDetailsService back off with AuthManagerResolver bean"
  Make UserDetailsService back off with AuthManagerResolver bean

Closes gh-28361

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,6 +32,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Lazy;
 import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.AuthenticationManagerResolver;
 import org.springframework.security.authentication.AuthenticationProvider;
 import org.springframework.security.config.annotation.ObjectPostProcessor;
 import org.springframework.security.core.userdetails.User;
@@ -56,7 +57,8 @@ import org.springframework.util.StringUtils;
 @ConditionalOnClass(AuthenticationManager.class)
 @ConditionalOnBean(ObjectPostProcessor.class)
 @ConditionalOnMissingBean(
-		value = { AuthenticationManager.class, AuthenticationProvider.class, UserDetailsService.class },
+		value = { AuthenticationManager.class, AuthenticationProvider.class, UserDetailsService.class,
+				AuthenticationManagerResolver.class },
 		type = { "org.springframework.security.oauth2.jwt.JwtDecoder",
 				"org.springframework.security.oauth2.server.resource.introspection.OpaqueTokenIntrospector" })
 public class UserDetailsServiceAutoConfiguration {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/servlet/UserDetailsServiceAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -31,6 +31,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.AuthenticationManagerResolver;
 import org.springframework.security.authentication.AuthenticationProvider;
 import org.springframework.security.authentication.ProviderManager;
 import org.springframework.security.authentication.TestingAuthenticationProvider;
@@ -83,6 +84,12 @@ class UserDetailsServiceAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void defaultUserNotCreatedIfAuthenticationManagerResolverBeanPresent(CapturedOutput output) {
+		this.contextRunner.withUserConfiguration(TestAuthenticationManagerResolverConfiguration.class)
+				.run((context) -> assertThat(output).doesNotContain("Using generated security password: "));
+	}
+
 	@Test
 	void defaultUserNotCreatedIfUserDetailsServiceBeanPresent(CapturedOutput output) {
 		this.contextRunner.withUserConfiguration(TestUserDetailsServiceConfiguration.class).run((context) -> {
@@ -266,4 +273,14 @@ class UserDetailsServiceAutoConfigurationTests {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	static class TestAuthenticationManagerResolverConfiguration {
+
+		@Bean
+		AuthenticationManagerResolver<?> authenticationManagerResolver() {
+			return mock(AuthenticationManagerResolver.class);
+		}
+
+	}
+
 }