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코드 블럭 | ||||
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├── antlr >> Group ID : antlr └── antlr >> Artifact ID : antlr ├── 2.7.2 >> Version : 2.7.2 │ ├── _remote.repositories │ ├── antlr-2.7.2.jar │ ├── antlr-2.7.2.jar.sha1 │ ├── antlr-2.7.2.pom │ └── antlr-2.7.2.pom.sha1 └── 2.7.7 ├── _remote.repositories ├── antlr-2.7.7-sources.jar.lastUpdated ├── antlr-2.7.7.jar ├── antlr-2.7.7.jar.sha1 ├── antlr-2.7.7.pom └── antlr-2.7.7.pom.sha1 ├── ch └── qos └── logback >> Group ID : ch.qos.logback └── logback-classic >> Artifact ID : logback-classic └── 1.2.3 >> Version : 1.2.3 ├── _remote.repositories ├── logback-classic-1.2.3-sources.jar ├── logback-classic-1.2.3-sources.jar.sha1 ├── logback-classic-1.2.3.jar ├── logback-classic-1.2.3.jar.sha1 ├── logback-classic-1.2.3.pom └── logback-classic-1.2.3.pom.sha1 |
Dependency Graph로 의존성 확인하기
Maven Dependency의 의존 구조
다음은 Maven POM의 dependency를 구조화한 도식입니다. 프로젝트에 dependency를 추가하는 경우 추가한 dependency는 또다른 dependency를 참조하고 있습니다. 대규모 프로젝트의 경우 굉장히 복잡한 구조를 가지고 있습니다.
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복잡한 dependency 구조를 갖는 프로젝트를 빌드하고 다른 프로젝트에서 이 결과물을 다시 활용하면 다시 복잡한 dependency 구조를 또 갖게 됩니다. 따라서 될 수 있으면 dependency의 구조를 간단하게 가지고 가는 것이 좋습니다.
IntelliJ IDEA에서 Dependency Graph 확인하기
IntelliJ IDEA에서 pom.xml
파일을 오픈한 상태에서 편집기로 마우스를 이동한 후 마우스 오른쪽 버튼을 눌러 다음과 같이 Show Dependencies... 메뉴를 클릭합니다.
그러면 다음과 같이 pom.xml
파일에 정의되어 있는 모든 dependency에 대해서 의존성 그래프가 그려집니다.
Maven의 Dependency Plugin을 이용하여 의존성 그래프 확인하기
Maven의 dependency plugin에는 의존성 그래프를 트리 형식으로 보여주는 기능을 제공하는 goal(tree)가 있습니다. 그렇다면 이 그래프를 왜 확인해야 하나요? 답은 dependency의 충돌(conflict) 문제를 해결하기 위해서 입니다.
코드 블럭 |
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# mvn dependency:tree [INFO] Scanning for projects... [INFO] [INFO] -------------< org.springframework.boot:spring-boot-ldap >-------------- [INFO] Building Spring Boot LDAP Sample 2.2.6.RELEASE [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-dependency-plugin:3.1.2:tree (default-cli) @ spring-boot-ldap --- [INFO] org.springframework.boot:spring-boot-ldap:jar:2.2.6.RELEASE [INFO] +- org.springframework.boot:spring-boot-starter-web:jar:2.2.6.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-starter:jar:2.2.6.RELEASE:compile [INFO] | | +- org.springframework.boot:spring-boot:jar:2.2.6.RELEASE:compile [INFO] | | +- org.springframework.boot:spring-boot-autoconfigure:jar:2.2.6.RELEASE:compile [INFO] | | +- org.springframework.boot:spring-boot-starter-logging:jar:2.2.6.RELEASE:compile [INFO] | | | +- ch.qos.logback:logback-classic:jar:1.2.3:compile [INFO] | | | | \- ch.qos.logback:logback-core:jar:1.2.3:compile [INFO] | | | +- org.apache.logging.log4j:log4j-to-slf4j:jar:2.12.1:compile [INFO] | | | | \- org.apache.logging.log4j:log4j-api:jar:2.12.1:compile [INFO] | | | \- org.slf4j:jul-to-slf4j:jar:1.7.30:compile [INFO] | | \- org.yaml:snakeyaml:jar:1.25:runtime [INFO] | +- org.springframework.boot:spring-boot-starter-json:jar:2.2.6.RELEASE:compile [INFO] | | +- com.fasterxml.jackson.core:jackson-databind:jar:2.10.3:compile [INFO] | | | +- com.fasterxml.jackson.core:jackson-annotations:jar:2.10.3:compile [INFO] | | | \- com.fasterxml.jackson.core:jackson-core:jar:2.10.3:compile [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.10.3:compile [INFO] | | +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.10.3:compile [INFO] | | \- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.10.3:compile [INFO] | +- org.springframework.boot:spring-boot-starter-validation:jar:2.2.6.RELEASE:compile [INFO] | | +- jakarta.validation:jakarta.validation-api:jar:2.0.2:compile [INFO] | | \- org.hibernate.validator:hibernate-validator:jar:6.0.18.Final:compile [INFO] | | +- org.jboss.logging:jboss-logging:jar:3.4.1.Final:compile [INFO] | | \- com.fasterxml:classmate:jar:1.5.1:compile [INFO] | +- org.springframework:spring-web:jar:5.2.5.RELEASE:compile [INFO] | \- org.springframework:spring-webmvc:jar:5.2.5.RELEASE:compile [INFO] | \- org.springframework:spring-expression:jar:5.2.5.RELEASE:compile [INFO] +- javax.servlet:jstl:jar:1.2:compile [INFO] +- org.springframework.data:spring-data-ldap:jar:2.2.6.RELEASE:compile [INFO] | +- org.springframework:spring-context:jar:5.2.5.RELEASE:compile [INFO] | +- org.springframework.ldap:spring-ldap-core:jar:2.3.2.RELEASE:compile [INFO] | +- org.springframework.data:spring-data-commons:jar:2.2.6.RELEASE:compile [INFO] | \- org.slf4j:slf4j-api:jar:1.7.30:compile [INFO] +- org.springframework.data:spring-data-jpa:jar:2.2.6.RELEASE:compile [INFO] | +- org.springframework:spring-orm:jar:5.2.5.RELEASE:compile [INFO] | +- org.springframework:spring-aop:jar:5.2.5.RELEASE:compile [INFO] | +- org.springframework:spring-tx:jar:5.2.5.RELEASE:compile [INFO] | +- org.springframework:spring-beans:jar:5.2.5.RELEASE:compile [INFO] | +- org.springframework:spring-core:jar:5.2.5.RELEASE:compile [INFO] | | \- org.springframework:spring-jcl:jar:5.2.5.RELEASE:compile [INFO] | \- org.aspectj:aspectjrt:jar:1.9.5:compile [INFO] +- org.apache.directory.server:apacheds-core:jar:1.5.7:test [INFO] | +- org.apache.directory.server:apacheds-i18n:jar:1.5.7:test [INFO] | +- org.apache.directory.server:apacheds-core-api:jar:1.5.7:test [INFO] | | \- org.apache.directory.server:apacheds-core-constants:jar:1.5.7:test [INFO] | +- org.apache.directory.server:apacheds-utils:jar:1.5.7:test [INFO] | +- bouncycastle:bcprov-jdk15:jar:140:test [INFO] | +- org.apache.directory.shared:shared-ldap:jar:0.9.19:test [INFO] | | +- commons-collections:commons-collections:jar:3.2.1:test [INFO] | | +- org.apache.directory.shared:shared-i18n:jar:0.9.19:test [INFO] | | \- antlr:antlr:jar:2.7.7:test [INFO] | +- org.apache.directory.shared:shared-ldap-schema:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-ldap-schema-loader:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-ldap-schema-manager:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-cursor:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-ldap-jndi:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-asn1-codec:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-asn1:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-ldap-constants:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-ldap-converter:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-ldap-schema-dao:jar:0.9.19:test [INFO] | +- org.apache.directory.shared:shared-ldif:jar:0.9.19:test [INFO] | \- org.apache.directory.shared:shared-dsml-parser:jar:0.9.19:test [INFO] | +- dom4j:dom4j:jar:1.6.1:test [INFO] | | \- xml-apis:xml-apis:jar:1.0.b2:test [INFO] | \- xpp3:xpp3:jar:1.1.4c:test [INFO] +- org.apache.directory.server:apacheds-core-entry:jar:1.5.7:test [INFO] +- org.apache.directory.server:apacheds-protocol-shared:jar:1.5.7:test [INFO] | \- org.apache.mina:mina-core:jar:2.0.0-RC1:test [INFO] +- org.apache.directory.server:apacheds-protocol-ldap:jar:1.5.7:test [INFO] | +- org.apache.directory.server:apacheds-kerberos-shared:jar:1.5.7:test [INFO] | | \- org.apache.directory.server:apacheds-core-jndi:jar:1.5.7:test [INFO] | \- org.apache.directory.server:apacheds-xdbm-tools:jar:1.5.7:test [INFO] | \- org.apache.directory.server:apacheds-xdbm-base:jar:1.5.7:test [INFO] +- org.apache.directory.server:apacheds-server-jndi:jar:1.5.7:test [INFO] | +- org.apache.directory.server:apacheds-ldif-partition:jar:1.5.7:test [INFO] | | +- org.apache.directory.server:apacheds-avl-partition:jar:1.5.7:test [INFO] | | | \- org.apache.directory.server:apacheds-core-avl:jar:1.5.7:test [INFO] | | \- org.apache.directory.server:apacheds-core-mock:jar:1.5.7:test [INFO] | \- org.apache.directory.server:apacheds-jdbm-partition:jar:1.5.7:test [INFO] | +- org.apache.directory.server:apacheds-jdbm-store:jar:1.5.7:test [INFO] | | \- org.apache.directory.server:apacheds-jdbm:jar:1.5.7:test [INFO] | \- org.apache.directory.server:apacheds-xdbm-search:jar:1.5.7:test [INFO] +- org.springframework.boot:spring-boot-starter-tomcat:jar:2.2.6.RELEASE:provided [INFO] | +- jakarta.annotation:jakarta.annotation-api:jar:1.3.5:compile [INFO] | +- org.apache.tomcat.embed:tomcat-embed-core:jar:9.0.33:provided [INFO] | +- org.apache.tomcat.embed:tomcat-embed-el:jar:9.0.33:provided [INFO] | \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:9.0.33:provided [INFO] +- org.apache.tomcat.embed:tomcat-embed-jasper:jar:9.0.33:provided [INFO] | \- org.eclipse.jdt:ecj:jar:3.18.0:provided [INFO] +- org.springframework.session:spring-session-jdbc:jar:2.2.2.RELEASE:compile [INFO] | +- org.springframework.session:spring-session-core:jar:2.2.2.RELEASE:compile [INFO] | \- org.springframework:spring-jdbc:jar:5.2.5.RELEASE:compile [INFO] +- org.springframework.boot:spring-boot-starter-jdbc:jar:2.2.6.RELEASE:compile [INFO] | \- com.zaxxer:HikariCP:jar:3.4.2:compile [INFO] +- com.h2database:h2:jar:1.4.200:compile [INFO] +- org.springframework.boot:spring-boot-starter-test:jar:2.2.6.RELEASE:test [INFO] | +- org.springframework.boot:spring-boot-test:jar:2.2.6.RELEASE:test [INFO] | +- org.springframework.boot:spring-boot-test-autoconfigure:jar:2.2.6.RELEASE:test [INFO] | +- com.jayway.jsonpath:json-path:jar:2.4.0:test [INFO] | | \- net.minidev:json-smart:jar:2.3:test [INFO] | | \- net.minidev:accessors-smart:jar:1.2:test [INFO] | | \- org.ow2.asm:asm:jar:5.0.4:test [INFO] | +- jakarta.xml.bind:jakarta.xml.bind-api:jar:2.3.3:test [INFO] | | \- jakarta.activation:jakarta.activation-api:jar:1.2.2:test [INFO] | +- org.junit.jupiter:junit-jupiter:jar:5.5.2:test [INFO] | | +- org.junit.jupiter:junit-jupiter-api:jar:5.5.2:test [INFO] | | | +- org.opentest4j:opentest4j:jar:1.2.0:test [INFO] | | | \- org.junit.platform:junit-platform-commons:jar:1.5.2:test [INFO] | | +- org.junit.jupiter:junit-jupiter-params:jar:5.5.2:test [INFO] | | \- org.junit.jupiter:junit-jupiter-engine:jar:5.5.2:test [INFO] | +- org.junit.vintage:junit-vintage-engine:jar:5.5.2:test [INFO] | | +- org.apiguardian:apiguardian-api:jar:1.1.0:test [INFO] | | +- org.junit.platform:junit-platform-engine:jar:1.5.2:test [INFO] | | \- junit:junit:jar:4.12:test [INFO] | +- org.mockito:mockito-junit-jupiter:jar:3.1.0:test [INFO] | +- org.assertj:assertj-core:jar:3.13.2:test [INFO] | +- org.hamcrest:hamcrest:jar:2.1:test [INFO] | +- org.mockito:mockito-core:jar:3.1.0:test [INFO] | | +- net.bytebuddy:byte-buddy:jar:1.10.8:test [INFO] | | +- net.bytebuddy:byte-buddy-agent:jar:1.10.8:test [INFO] | | \- org.objenesis:objenesis:jar:2.6:test [INFO] | +- org.skyscreamer:jsonassert:jar:1.5.0:test [INFO] | | \- com.vaadin.external.google:android-json:jar:0.0.20131108.vaadin1:test [INFO] | +- org.springframework:spring-test:jar:5.2.5.RELEASE:test [INFO] | \- org.xmlunit:xmlunit-core:jar:2.6.4:test [INFO] \- org.springframework.ldap:spring-ldap-test:jar:2.3.2.RELEASE:test [INFO] +- com.google.code.typica:typica:jar:1.3:test [INFO] | +- commons-httpclient:commons-httpclient:jar:3.1:test [INFO] | \- commons-codec:commons-codec:jar:1.13:test [INFO] +- commons-io:commons-io:jar:2.4:test [INFO] +- commons-lang:commons-lang:jar:2.6:test [INFO] +- javax.activation:activation:jar:1.1:test [INFO] \- org.springframework.ldap:spring-ldap-ldif-core:jar:2.3.2.RELEASE:test [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1.953 s [INFO] Finished at: 2020-04-20T01:54:58+09:00 [INFO] ------------------------------------------------------------------------ |
Dependency의 충돌
다음은 dependency의 충돌 사례입니다. 프로젝트에서 POM에 dependency를 추가했을 때 추가한 dependency가 다른 dependency를 활용하게 되는데 이때 다음과 같이 버전간의 문제가 발생할 수 있습니다. 버전에 따라서 메소드가 추가 또는 삭제가 될 수 있고, 메소드의 signature가 변경될 수도 있습니다. 이 경우 빌드나 컴파일시 에러가 발생할 수 있습니다. Maven 초보자의 경우 이렇게 발생하는 충돌 문제를 해결하는 것이 쉽지 않습니다.
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