Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.web.server.SecurityWebFilterChain]: Factory method 'springSecurityFilterChain' threw exception with message: authenticationManager cannot be null	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:177) ~ [spring-beans-6.1.2.jar:6.1.2]	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:651) ~ [spring-beans-6.1.2.jar:6.1.2]	... 143 common frames omitted Caused by: java.lang.IllegalArgumentException: authenticationManager cannot be null	at org.springframework.util.Assert.notNull(Assert.java:172) ~[spring-core-6.1.2.jar:6.1.2] at org.springframework.security.web.server.authentication.AuthenticationWebFilter.<init> (AuthenticationWebFilter.java:94) ~[spring-security-web-6.2.1.jar:6.2.1]	at org.springframework.security.config.web.server.ServerHttpSecurity$HttpBasicSpec.configure(ServerHttpSecurity.java:2305) ~[spring-security-config-6.2.1.jar:6.2.1]	at org.springframework.security.config.web.server.ServerHttpSecurity.build(ServerHttpSecurity.java:1545) ~[spring- security-config-6.2.1.jar:6.2.1]	at org.springframework.boot.actuate.autoconfigure.security.reactive.ReactiveManagementWebSecurityAutoConfiguration.sprin gSecurityFilterChain(ReactiveManagementWebSecurityAutoConfiguration.java:69) ~[spring-boot-actuator-autoconfigure- 3.2.1.jar:3.2.1]	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]	at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:140) ~ [spring-beans-6.1.2.jar:6.1.2]	... 144 common frames omitted 

 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-webflux</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-validation</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-oauth2-resource-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-cache</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency>	<dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-api</artifactId> <version>${jwt.version}</version> </dependency> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-impl</artifactId> <version>${jwt.version}</version> </dependency> <dependency> <groupId>io.jsonwebtoken</groupId> <artifactId>jjwt-gson</artifactId> <version>${jwt.version}</version> </dependency> <dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form</artifactId> <version>${feign-form.version}</version> </dependency> <dependency> <groupId>com.github.ben-manes.caffeine</groupId> <artifactId>caffeine</artifactId> <version>${caffeine.version}</version> </dependency> <dependency> <groupId>com.playtika.reactivefeign</groupId> <artifactId>feign-reactor-spring-cloud-starter</artifactId> <version>${reactive-feign.version}</version> <type>pom</type> </dependency> 

@Configuration @ComponentScan(basePackageClasses = SecurityConfig.class) @EnableReactiveMethodSecurity @EnableWebFluxSecurity @EnableConfigurationProperties({ ClientProperties.class, MultipleIssuersProperties.class }) class SecurityConfig { AuthenticationExceptionEntryPoint authenticationEntryPoint; // autowired Issuer mainIssuer; MultipleIssuersProperties issuers; List<String> whitelistedUrls; List<String> allowedOrigins; // Constructor omitted @Bean public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) { return http .authorizeExchange(exchange -> exchange .pathMatchers(whitelistedUrls.toArray(String[]::new)) .permitAll() .anyExchange().authenticated()) .cors(cors -> cors.configurationSource(corsConfigurationSource())) .csrf(CsrfSpec::disable) .exceptionHandling(exception -> exception.authenticationEntryPoint(authenticationEntryPoint)) .oauth2ResourceServer(server -> server.authenticationManagerResolver(reactiveAuthenticationManagerResolver())) .build(); } @Bean public JwtIssuerReactiveAuthenticationManagerResolver reactiveAuthenticationManagerResolver() { var managers = new HashMap<String, ReactiveAuthenticationManager>(); managers.put( mainIssuer.issuerUri(), new JwtReactiveAuthenticationManager(reactiveJwtDecoder()) ); issuers.issuers().forEach(issuer -> { var jwkSource = reactiveRemoteJWKSource(issuer); var jwtDecoder = reactiveJwtDecoder(issuer, jwkSource); var manager = new JwtReactiveAuthenticationManager(jwtDecoder); managers.put(issuer.issuerUri(), manager); }); return new JwtIssuerReactiveAuthenticationManagerResolver(issuer -> justOrEmpty(managers.get(issuer))); } @Bean public ReactiveJwtDecoder reactiveJwtDecoder() { return reactiveJwtDecoder(mainIssuer, reactiveRemoteJWKSource()); } // other beans omitted