[Boot Error] contextLoads() FAILED

1. 에러명

java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder

SchedulerApplicationTests > contextLoads() FAILED
    java.lang.NoClassDefFoundError at LogbackLoggingSystem.java:293
        Caused by: java.lang.ClassNotFoundException at BuiltinClassLoader.java:581

 

보통 ContextLoads() error는 mysql 연결안될때 많이 발생하던데 나는 Logback을 설치하고 나서부터 에러가 발생하였다.

 

2. 해결방법

build.gradle

dependencies{
    implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.14.0'
	implementation 'org.springframework.boot:spring-boot-starter'
	implementation 'org.springframework.boot:spring-boot-starter-web'
	compileOnly 'org.projectlombok:lombok'
	implementation 'com.google.code.gson:gson:2.9.0'
	developmentOnly 'org.springframework.boot:spring-boot-devtools'
	implementation 'org.springframework:spring-webflux:5.3.23'
	annotationProcessor 'org.projectlombok:lombok'
	testImplementation 'org.springframework.boot:spring-boot-starter-test'
	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
	runtimeOnly 'mysql:mysql-connector-java'
	testImplementation 'ch.qos.logback:logback-classic:1.4.4'
	implementation 'org.slf4j:jcl-over-slf4j:2.0.3'.
	implementation 'org.slf4j:slf4j-api:1.7.5'
    
    // 추가한 library
	annotationProcessor 'org.projectlombok:lombok'
	testImplementation 'org.slf4j:slf4j-simple:1.7.25'
}

 

3. 새로운 error

다른 에러가 발생했다.

SchedulerApplicationTests > contextLoads() FAILED
    java.lang.IllegalStateException at DefaultCacheAwareContextLoaderDelegate.java:132
        Caused by: java.lang.IllegalArgumentException at Assert.java:702

 

4. 진짜 해결

음 에러로그를 중간쯤 읽다보니 Slf4j 나 Loggerback 둘중에 하나를 삭제하라는 메시지를 발견했다.

아무래도 충돌하는것같다. 원래 같이 쓰면 안되나..? 

Springboot 가 기본적으로 Slf4j를 가지고 있기 때문에 아무래도 그런거같다.

그래서 dependencies 에서 logback삭제해주었더니 잘 되었다.!!!

dependencies {
	implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.14.0'
	implementation 'org.springframework.boot:spring-boot-starter'
	implementation 'org.springframework.boot:spring-boot-starter-web'
	compileOnly 'org.projectlombok:lombok'
	annotationProcessor 'org.projectlombok:lombok'
	implementation 'com.google.code.gson:gson:2.9.0'
	developmentOnly 'org.springframework.boot:spring-boot-devtools'
	implementation 'org.springframework:spring-webflux:5.3.23'
	annotationProcessor 'org.projectlombok:lombok'
	testImplementation 'org.springframework.boot:spring-boot-starter-test'
	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
	runtimeOnly 'mysql:mysql-connector-java'

	implementation 'org.slf4j:slf4j-api:1.7.5'
	implementation 'org.slf4j:jcl-over-slf4j:2.0.3'

}

Reference

https://applepick.tistory.com/134

Spring Boot gradle 환경에서 logback을 적용해보자. 🔥

https://donzbox.tistory.com/601

이클립스에서 SpringBoot Gradle JAR파일 배포 및 실행 방법

https://xzio.tistory.com/1375

[스프링 오류] java.lang.NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder와 java.lang.NoClassDefFoundError: org/slf4