Auto-configure Spring rather than Nimbus opaque token introspectors

See gh-29572

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/resource/reactive/ReactiveOAuth2ResourceServerOpaqueTokenConfiguration.java

@@ -24,8 +24,8 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.web.server.ServerHttpSecurity;
 import org.springframework.security.config.web.server.ServerHttpSecurity.OAuth2ResourceServerSpec;
-import org.springframework.security.oauth2.server.resource.introspection.NimbusReactiveOpaqueTokenIntrospector;
 import org.springframework.security.oauth2.server.resource.introspection.ReactiveOpaqueTokenIntrospector;
+import org.springframework.security.oauth2.server.resource.introspection.SpringReactiveOpaqueTokenIntrospector;
 import org.springframework.security.web.server.SecurityWebFilterChain;
 
 /**
@@ -43,9 +43,9 @@ class ReactiveOAuth2ResourceServerOpaqueTokenConfiguration {
 
 		@Bean
 		@ConditionalOnProperty(name = "spring.security.oauth2.resourceserver.opaquetoken.introspection-uri")
-		NimbusReactiveOpaqueTokenIntrospector opaqueTokenIntrospector(OAuth2ResourceServerProperties properties) {
+		SpringReactiveOpaqueTokenIntrospector opaqueTokenIntrospector(OAuth2ResourceServerProperties properties) {
 			OAuth2ResourceServerProperties.Opaquetoken opaqueToken = properties.getOpaquetoken();
-			return new NimbusReactiveOpaqueTokenIntrospector(opaqueToken.getIntrospectionUri(),
+			return new SpringReactiveOpaqueTokenIntrospector(opaqueToken.getIntrospectionUri(),
 					opaqueToken.getClientId(), opaqueToken.getClientSecret());
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/oauth2/resource/servlet/OAuth2ResourceServerOpaqueTokenConfiguration.java

@@ -26,8 +26,8 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
 import org.springframework.security.config.annotation.web.configurers.oauth2.server.resource.OAuth2ResourceServerConfigurer;
-import org.springframework.security.oauth2.server.resource.introspection.NimbusOpaqueTokenIntrospector;
 import org.springframework.security.oauth2.server.resource.introspection.OpaqueTokenIntrospector;
+import org.springframework.security.oauth2.server.resource.introspection.SpringOpaqueTokenIntrospector;
 import org.springframework.security.web.SecurityFilterChain;
 
 /**
@@ -46,9 +46,9 @@ class OAuth2ResourceServerOpaqueTokenConfiguration {
 
 		@Bean
 		@ConditionalOnProperty(name = "spring.security.oauth2.resourceserver.opaquetoken.introspection-uri")
-		NimbusOpaqueTokenIntrospector opaqueTokenIntrospector(OAuth2ResourceServerProperties properties) {
+		SpringOpaqueTokenIntrospector opaqueTokenIntrospector(OAuth2ResourceServerProperties properties) {
 			OAuth2ResourceServerProperties.Opaquetoken opaqueToken = properties.getOpaquetoken();
-			return new NimbusOpaqueTokenIntrospector(opaqueToken.getIntrospectionUri(), opaqueToken.getClientId(),
+			return new SpringOpaqueTokenIntrospector(opaqueToken.getIntrospectionUri(), opaqueToken.getClientId(),
 					opaqueToken.getClientSecret());
 		}