Unable to load io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider
I'm upgrading my Spring Boot version from 2.1.x to 2.4.2/2.4.3 and using Redisson as Redis Client in the project. When I compiled and run the code, I got the following warning:
2021-03-02 09:05:55.081 INFO 24460 --- [ main] org.redisson.Version : Redisson 3.12.5 2021-03-02 09:05:55.118 WARN 24460 --- [ main] i.n.r.d.DnsServerAddressStreamProviders : Unable to load io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider, fallback to system defaults. This may result in incorrect DNS resolutions on MacOS. java.lang.ClassNotFoundException: io.netty.resolver.dns.macos.MacOSDnsServerAddressStreamProvider at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_261] at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[na:1.8.0_261] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355) ~[na:1.8.0_261] at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[na:1.8.0_261] at java.lang.Class.forName0(Native Method) ~[na:1.8.0_261] at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_261] at io.netty.resolver.dns.DnsServerAddressStreamProviders$1.run(DnsServerAddressStreamProviders.java:50) ~[netty-resolver-dns-4.1.59.Final.jar:4.1.59.Final] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_261] at io.netty.resolver.dns.DnsServerAddressStreamProviders.<clinit>(DnsServerAddressStreamProviders.java:46) ~[netty-resolver-dns-4.1.59.Final.jar:4.1.59.Final] at org.redisson.connection.MasterSlaveConnectionManager.<init>(MasterSlaveConnectionManager.java:211) [redisson-3.12.5.jar:3.12.5] at org.redisson.connection.MasterSlaveConnectionManager.<init>(MasterSlaveConnectionManager.java:163) [redisson-3.12.5.jar:3.12.5] at org.redisson.connection.SingleConnectionManager.<init>(SingleConnectionManager.java:34) [redisson-3.12.5.jar:3.12.5] at org.redisson.config.ConfigSupport.createConnectionManager(ConfigSupport.java:197) [redisson-3.12.5.jar:3.12.5] at org.redisson.Redisson.<init>(Redisson.java:64) [redisson-3.12.5.jar:3.12.5] at org.redisson.Redisson.create(Redisson.java:104) [redisson-3.12.5.jar:3.12.5] at org.redisson.spring.starter.RedissonAutoConfiguration.redisson(RedissonAutoConfiguration.java:172) [redisson-spring-boot-starter-3.12.5.jar:3.12.5] at org.redisson.spring.starter.RedissonAutoConfiguration$$EnhancerBySpringCGLIB$$43a1494c.CGLIB$redisson$1(<generated>) [redisson-spring-boot-starter-3.12.5.jar:3.12.5] at org.redisson.spring.starter.RedissonAutoConfiguration$$EnhancerBySpringCGLIB$$43a1494c$$FastClassBySpringCGLIB$$164643ff.invoke(<generated>) [redisson-spring-boot-starter-3.12.5.jar:3.12.5] at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) [spring-core-5.3.4.jar:5.3.4] at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) [spring-context-5.3.4.jar:5.3.4] at org.redisson.spring.starter.RedissonAutoConfiguration$$EnhancerBySpringCGLIB$$43a1494c.redisson(<generated>) [redisson-spring-boot-starter-3.12.5.jar:3.12.5] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_261] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_261] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_261] at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:486) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) [spring-beans-5.3.4.jar:5.3.4] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.4.jar:5.3.4] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:917) ~[spring-context-5.3.4.jar:5.3.4] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:582) ~[spring-context-5.3.4.jar:5.3.4] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.3.jar:2.4.3] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.3.jar:2.4.3] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.3.jar:2.4.3] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.3.jar:2.4.3] at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.3.jar:2.4.3] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1311) ~[spring-boot-2.4.3.jar:2.4.3] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300) ~[spring-boot-2.4.3.jar:2.4.3] at com.zkh360.Application.main(BossDataSyncApplication.java:18) ~[classes/:na]
However, my code continues to run and to use Redis in my machine. When I deploy the project to DEV environment which is in AWS and CentOS machine, there is no such warning message in the logs. I suspect that there is an incompatibility issue between Spring Boot and Redisson in MacBook when resolving DNS for Redis because when I downgraded Spring Boot to 2.4.1, no warning messages occurred.
For this pull request https://github.com/netty/netty/pull/10848, the log level changes from "debug" to "warn."
To solve this problem, you can add this dependency:
<dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> </dependency>
https://stackoverflow.com/questions/65954571/spring-boot-2-4-2-redisson-client-dns-resolution-problem-at-start/65976398
https://github.com/reactor/reactor-netty/pull/1435
