[Spring Cloud + JWT + Redis] Spring Cloud Gradle 멀티모듈 환경에서 Redis 연결 오류

JWT 중복 로그인 방지 기능 개발을 하다가 다음과 같은 오류를 만났습니다.

org.springframework.data.redis.RedisConnectionFailureException: Unable to connect to Redis
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.translateException(LettuceConnectionFactory.java:1858) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.java:1789) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getNativeConnection(LettuceConnectionFactory.java:1586) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.lambda$getConnection$0(LettuceConnectionFactory.java:1566) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.doInLock(LettuceConnectionFactory.java:1527) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$SharedConnection.getConnection(LettuceConnectionFactory.java:1563) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getSharedConnection(LettuceConnectionFactory.java:1249) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory.getConnection(LettuceConnectionFactory.java:1055) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.core.RedisConnectionUtils.fetchConnection(RedisConnectionUtils.java:195) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.core.RedisConnectionUtils.doGetConnection(RedisConnectionUtils.java:144) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:105) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.core.RedisConnectionUtils.getConnection(RedisConnectionUtils.java:92) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.data.redis.RedisHealthIndicator.doHealthCheck(RedisHealthIndicator.java:49) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:82) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthIndicator.getHealth(HealthIndicator.java:37) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpoint.getHealth(HealthEndpoint.java:82) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpoint.getHealth(HealthEndpoint.java:41) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpointSupport.getLoggedHealth(HealthEndpointSupport.java:172) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpointSupport.getContribution(HealthEndpointSupport.java:145) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpointSupport.getAggregateContribution(HealthEndpointSupport.java:156) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpointSupport.getContribution(HealthEndpointSupport.java:141) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:110) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:81) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpoint.health(HealthEndpoint.java:76) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.health.HealthEndpoint.health(HealthEndpoint.java:66) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	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.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:281) ~[spring-core-6.2.3.jar:6.2.3]
	at org.springframework.boot.actuate.endpoint.invoke.reflect.ReflectiveOperationInvoker.invoke(ReflectiveOperationInvoker.java:74) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredOperation.invoke(AbstractDiscoveredOperation.java:60) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.endpoint.jmx.EndpointMBean.invoke(EndpointMBean.java:124) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at org.springframework.boot.actuate.endpoint.jmx.EndpointMBean.invoke(EndpointMBean.java:97) ~[spring-boot-actuator-3.4.3.jar:3.4.3]
	at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:814) ~[na:na]
	at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:802) ~[na:na]
	at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1472) ~[na:na]
	at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1310) ~[na:na]
	at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1405) ~[na:na]
	at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) ~[na:na]
	at java.base/jdk.internal.reflect.GeneratedMethodAccessor34.invoke(Unknown Source) ~[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 java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360) ~[na:na]
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200) ~[na:na]
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197) ~[na:na]
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712) ~[na:na]
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196) ~[na:na]
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587) ~[na:na]
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828) ~[na:na]
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705) ~[na:na]
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399) ~[na:na]
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704) ~[na:na]
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[na:na]
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[na:na]
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
Caused by: io.lettuce.core.RedisConnectionException: Unable to connect to localhost/<unresolved>:6379
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:63) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.RedisConnectionException.create(RedisConnectionException.java:41) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.AbstractRedisClient.getConnection(AbstractRedisClient.java:354) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.RedisClient.connect(RedisClient.java:219) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.lambda$getConnection$1(StandaloneConnectionProvider.java:112) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at java.base/java.util.Optional.orElseGet(Optional.java:364) ~[na:na]
	at org.springframework.data.redis.connection.lettuce.StandaloneConnectionProvider.getConnection(StandaloneConnectionProvider.java:112) ~[spring-data-redis-3.4.3.jar:3.4.3]
	at org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory$ExceptionTranslatingConnectionProvider.getConnection(LettuceConnectionFactory.java:1787) ~[spring-data-redis-3.4.3.jar:3.4.3]
	... 54 common frames omitted
Caused by: io.lettuce.core.RedisCommandExecutionException: NOAUTH HELLO must be called with the client already authenticated, otherwise the HELLO <proto> AUTH <user> <pass> option can be used to authenticate the client and select the RESP protocol version at the same time
	at io.lettuce.core.internal.ExceptionFactory.createExecutionException(ExceptionFactory.java:151) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.internal.ExceptionFactory.createExecutionException(ExceptionFactory.java:120) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.protocol.AsyncCommand.completeResult(AsyncCommand.java:124) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.protocol.AsyncCommand.complete(AsyncCommand.java:115) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.protocol.CommandWrapper.complete(CommandWrapper.java:67) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.protocol.CommandHandler.complete(CommandHandler.java:749) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.protocol.CommandHandler.decode(CommandHandler.java:684) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.lettuce.core.protocol.CommandHandler.channelRead(CommandHandler.java:601) ~[lettuce-core-6.4.2.RELEASE.jar:6.4.2.RELEASE/f4dfb40]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1357) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:868) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:796) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:732) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:658) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562) ~[netty-transport-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:998) ~[netty-common-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.118.Final.jar:4.1.118.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.118.Final.jar:4.1.118.Final]
	... 1 common frames omitted
	

(귀찮아서 전부 다 그냥 긁어왔습니다..)

내용을 파악해보니 Redis의 패스워드를 설정해주질 않아서 발생한 오류더군요.....

기존에 RedisConfig에서는 LettuceConnectionFactory를 바로 생성해주었는데, 자동으로 Config-Module에 있는 yml을 읽어가질 못하고 있었습니다.

 

그래서 아래와 같이 Config Class를 변경하였습니다.

@Configuration
@RequiredArgsConstructor
@EnableRedisRepositories
public class RedisConfig {
    @Value("${spring.data.redis.host}")
    private String host;
    @Value("${spring.data.redis.port}")
    private int port;
    @Value("${spring.data.redis.password}")
    private String password;

    @Bean
    public RedisConnectionFactory redisConnectionFactory() {
        RedisStandaloneConfiguration configuration = new RedisStandaloneConfiguration();
        configuration.setHostName(host);
        configuration.setPort(port);
        configuration.setPassword(password); // Password 설정
        // configuration을 직접 만들어 factory에 전달
        LettuceConnectionFactory factory = new LettuceConnectionFactory(configuration);
        return factory;
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate() {
        RedisTemplate<String, String> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory());
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(new StringRedisSerializer());
        return redisTemplate;
    }
}