BeanCreationException 에러

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'localRedisConfig': Injection of autowired dependencies failed
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:514) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1418) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:598) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:521) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:975) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:959) ~[spring-context-6.1.3.jar:6.1.3]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:624) ~[spring-context-6.1.3.jar:6.1.3]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.2.2.jar:3.2.2]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-3.2.2.jar:3.2.2]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) ~[spring-boot-3.2.2.jar:3.2.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:334) ~[spring-boot-3.2.2.jar:3.2.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354) ~[spring-boot-3.2.2.jar:3.2.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-3.2.2.jar:3.2.2]
	at com.example.account.AccountApplication.main(AccountApplication.java:10) ~[main/:na]
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'spring.redis.port' in value "${spring.redis.port}"
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:180) ~[spring-core-6.1.3.jar:6.1.3]
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-6.1.3.jar:6.1.3]
	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-6.1.3.jar:6.1.3]
	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-6.1.3.jar:6.1.3]
	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:200) ~[spring-context-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:921) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1374) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1353) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:784) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:767) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:145) ~[spring-beans-6.1.3.jar:6.1.3]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:508) ~[spring-beans-6.1.3.jar:6.1.3]
	... 17 common frames omitted

에러 전문은 위와 같다. 전체를 다 살펴볼 필요는 없고 첫째줄에 BeanCreationException 와 Error creating bean with name 'localRedisConfig': Injection of autowired dependencies failed 이 부분을 검색해서 문제점을 발견했다.

++++
이 글을 쓰면서 발견한건데 에러 메시지에 Caused by: ~ 로 문제 원인 정확히 알려주고 있었다!!!!

처음에 위의 BeanCreationException으로 검색했을 때는 어노테이션이 어딘가 빠져서 Bean을 생성되지 않았다고들 했다. 그래서 모든 클래스를 돌며 어노테이션 빠진 곳을 찾았는데 어느 글에서 빈으로 등록한 이름과 실제 변수명이 달라서 나타낸 문제점이라고 말한 것이 눈에 띄었다.
이 점에 주목해서 redis 설정하는 과정에서 강의와 내가 설정한 yml파일이 달라서 일어난 에러였다.

	@Value("${spring.redis.port}")
    private int redisPort;

아래는 내가 작성한 yml 파일.

spring:
	data:
    	redis:
      		host: 127.0.0.1
      		port: 6379

실제 강의에 쓰여진 yml 파일

spring:
    redis:
      	host: 127.0.0.1
      	port: 6379

정확하진 않지만 약 2년 전 강의인데 지금은 spring.redis.port를 금하고 있는 것 같다. (대신에 spring.data.redis.port 사용)

이렇게 바꿔놓고 위에 처럼 spring.redis.port라고 쓰니까 작동이 안 되지.

	@Value("${spring.data.redis.port}")
    private int redisPort;

다음과 같이 바꾸니까 해결되었다!
네임명 잘 확인하자.