1. The project uses SpringBoot to develop, integrated Redis and session shares, can connect to Redis normally when the JAR package is started, after the WAR package, always report the Redis connection exception, unable to start the project, the error message is as follows:

2020-12-23 11:05:34.867 ERROR org.springframework.boot.SpringApplication - Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'enableRedisKeyspaceNotificationsInitializer' defined in class path resource [org/springframework/boot/autoconfigure/session/RedisSessionConfiguration$SpringBootRedisHttpSessionConfiguration.class]: Invocation of init method failed; nested exception is org.springframework.data.redis.RedisSystemException: Unknown redis exception; nested exception is org.springframework.data.redis.connection.PoolException: Could not get a resource from the pool; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to 10.102.110.103:6379
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:152) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:132) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:92) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:172) ~[spring-web-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5144) ~[catalina.jar:8.5.61]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[catalina.jar:8.5.61]
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:743) ~[catalina.jar:8.5.61]
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:719) ~[catalina.jar:8.5.61]
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705) ~[catalina.jar:8.5.61]
	at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1719) ~[catalina.jar:8.5.61]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:286) ~[tomcat-coyote.jar:8.5.61]
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) ~[?:1.8.0_131]
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) ~[?:1.8.0_131]
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:482) ~[catalina.jar:8.5.61]
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431) ~[catalina.jar:8.5.61]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:286) ~[tomcat-coyote.jar:8.5.61]
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) ~[?:1.8.0_131]
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) ~[?:1.8.0_131]
	at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468) ~[?:1.8.0_131]
	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468) ~[?:1.8.0_131]
	at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) ~[?:1.8.0_131]
	at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) ~[?:1.8.0_131]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_131]
	at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408) ~[?:1.8.0_131]
	at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131]
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346) ~[?:1.8.0_131]
	at sun.rmi.transport.Transport$1.run(Transport.java:200) ~[?:1.8.0_131]
	at sun.rmi.transport.Transport$1.run(Transport.java:197) ~[?:1.8.0_131]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_131]
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196) ~[?:1.8.0_131]
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) ~[?:1.8.0_131]
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) ~[?:1.8.0_131]
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683) ~[?:1.8.0_131]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_131]
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) [?:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_131]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_131]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]
Caused by: org.springframework.data.redis.RedisSystemException: Unknown redis exception; nested exception is org.springframework.data.redis.connection.PoolException: Could not get a resource from the pool; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to 10.102.110.103:6379
	at org.springframework.data.redis.FallbackExceptionTranslationStrategy.getFallback(FallbackExceptionTranslationStrategy.java:53) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.FallbackExceptionTranslationStrategy.translate(FallbackExceptionTranslationStrategy.java:43) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceConnection.convertLettuceAccessException(LettuceConnection.java:270) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceServerCommands.convertLettuceAccessException(LettuceServerCommands.java:571) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceServerCommands.getConfig(LettuceServerCommands.java:307) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.DefaultedRedisConnection.getConfig(DefaultedRedisConnection.java:1319) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.session.data.redis.config.ConfigureNotifyKeyspaceEventsAction.getNotifyOptions(ConfigureNotifyKeyspaceEventsAction.java:76) ~[spring-session-data-redis-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.session.data.redis.config.ConfigureNotifyKeyspaceEventsAction.configure(ConfigureNotifyKeyspaceEventsAction.java:57) ~[spring-session-data-redis-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration$EnableRedisKeyspaceNotificationsInitializer.afterPropertiesSet(RedisHttpSessionConfiguration.java:333) ~[spring-session-data-redis-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1855) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1792) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	... 63 more
Caused by: org.springframework.data.redis.connection.PoolException: Could not get a resource from the pool; nested exception is io.lettuce.core.RedisConnectionException: Unable to connect to 10.102.110.103:6379
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.getConnection(LettucePoolingConnectionProvider.java:109) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceConnection.doGetAsyncDedicatedConnection(LettuceConnection.java:1002) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceConnection.getDedicatedConnection(LettuceConnection.java:985) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceConnection.getConnection(LettuceConnection.java:942) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceServerCommands.getConnection(LettuceServerCommands.java:567) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettuceServerCommands.getConfig(LettuceServerCommands.java:305) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.DefaultedRedisConnection.getConfig(DefaultedRedisConnection.java:1319) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.session.data.redis.config.ConfigureNotifyKeyspaceEventsAction.getNotifyOptions(ConfigureNotifyKeyspaceEventsAction.java:76) ~[spring-session-data-redis-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.session.data.redis.config.ConfigureNotifyKeyspaceEventsAction.configure(ConfigureNotifyKeyspaceEventsAction.java:57) ~[spring-session-data-redis-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration$EnableRedisKeyspaceNotificationsInitializer.afterPropertiesSet(RedisHttpSessionConfiguration.java:333) ~[spring-session-data-redis-2.2.2.RELEASE.jar:2.2.2.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1855) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1792) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	... 63 more
Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to 10.102.110.103:6379
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:78) ~[lettuce-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:56) ~[lettuce-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:234) ~[lettuce-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	at io.lettuce.core.RedisClient.connect(RedisClient.java:207) ~[lettuce-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:115) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at java.util.Optional.orElseGet(Optional.java:267) ~[?:1.8.0_131]
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:115) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.data.redis.connection.lettuce.LettucePoolingConnectionProvider.lambda$null$0(LettucePoolingConnectionProvider.java:97) ~[spring-data-redis-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:209) ~[lettuce-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]
	at io.lettuce.core.support.ConnectionPoolSupport$RedisPooledObjectFactory.create(ConnectionPoolSupport.java:199) ~[lettuce-core-5.2.2.RELEASE.jar:5.2.2.RELEASE]

2. Track the source code (CheckAddress method for sun.nio.ch.net) to view the cause of the error, as shown below:

3. Continue to track the upper class that generates the ADDR, is to use the Netty Framework to communicate, so doubt it is a Netty issue, re-add Netty dependencies:

  # Add Netty dependence in Pom.xml
<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.45.Final</version>
</dependency>

4. Summary

After reaching WAR bag, you can run normally. Of course, this cause by: java.nio.channels.unResolvedaddressException error is a universal error, there is a lot of reasons for error, there are many other types of error on the Internet, and this is only a problem positioning And solve records, non-universal solutions.