Spring Boot：多个SLF4J绑定
这可能是一个重复的问题，但我无法弄清楚绑定碰撞在哪里。 我有我的Spring Boot 1.2.6.RELEASE服务，当我运行它时我收到此错误：
SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/home/jscherman/.m2/repository/ch/qos/logback/logback-classic/1.1.3/logback-classic-1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/home/jscherman/.m2/repository/org/slf4j/slf4j-log4j12/1.7.12/slf4j-log4j12-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
这是mvn dependency:tree输出
[INFO] com.myenterprise:product-manager:jar:0.0.1-SNAPSHOT [INFO] +- com.myenterprise.product:myproject-api:jar:0.0.1-SNAPSHOT:compile [INFO] +- com.myenterprise.product:myproject-core:jar:0.0.1-SNAPSHOT:compile [INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.2.6.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.2.6.RELEASE:compile [INFO] | | +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.0.26:compile [INFO] | | +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.0.26:compile [INFO] | | +- org.apache.tomcat.embed:tomcat-embed-logging-juli:jar:8.0.26:compile [INFO] | | \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.0.26:compile [INFO] | +- com.fasterxml.jackson.core:jackson-databind:jar:2.4.6:compile [INFO] | | +- com.fasterxml.jackson.core:jackson-annotations:jar:2.4.6:compile [INFO] | | \- com.fasterxml.jackson.core:jackson-core:jar:2.4.6:compile [INFO] | +- org.hibernate:hibernate-validator:jar:5.1.3.Final:compile [INFO] | | +- javax.validation:validation-api:jar:1.1.0.Final:compile [INFO] | | +- org.jboss.logging:jboss-logging:jar:3.1.3.GA:compile [INFO] | | \- com.fasterxml:classmate:jar:1.0.0:compile [INFO] | +- org.springframework:spring-core:jar:4.1.7.RELEASE:compile [INFO] | +- org.springframework:spring-web:jar:4.1.7.RELEASE:compile [INFO] | | \- org.springframework:spring-aop:jar:4.1.7.RELEASE:compile [INFO] | \- org.springframework:spring-webmvc:jar:4.1.7.RELEASE:compile [INFO] | \- org.springframework:spring-expression:jar:4.1.7.RELEASE:compile [INFO] +- org.springframework.boot:spring-boot-starter-data-jpa:jar:1.2.6.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-starter-aop:jar:1.2.6.RELEASE:compile [INFO] | | +- org.aspectj:aspectjrt:jar:1.8.6:compile [INFO] | | \- org.aspectj:aspectjweaver:jar:1.8.6:compile [INFO] | +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.2.6.RELEASE:compile [INFO] | | +- org.springframework:spring-jdbc:jar:4.1.7.RELEASE:compile [INFO] | | +- org.apache.tomcat:tomcat-jdbc:jar:8.0.26:compile [INFO] | | | \- org.apache.tomcat:tomcat-juli:jar:8.0.26:compile [INFO] | | \- org.springframework:spring-tx:jar:4.1.7.RELEASE:compile [INFO] | +- org.hibernate:hibernate-entitymanager:jar:4.3.11.Final:compile [INFO] | | +- org.jboss.logging:jboss-logging-annotations:jar:1.2.0.Beta1:compile [INFO] | | +- org.hibernate:hibernate-core:jar:4.3.11.Final:compile [INFO] | | | +- antlr:antlr:jar:2.7.7:compile [INFO] | | | \- org.jboss:jandex:jar:1.1.0.Final:compile [INFO] | | +- dom4j:dom4j:jar:1.6.1:compile [INFO] | | | \- xml-apis:xml-apis:jar:1.0.b2:compile [INFO] | | +- org.hibernate.common:hibernate-commons-annotations:jar:4.0.5.Final:compile [INFO] | | +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile [INFO] | | \- org.javassist:javassist:jar:3.18.1-GA:compile [INFO] | +- javax.transaction:javax.transaction-api:jar:1.2:compile [INFO] | +- org.springframework:spring-orm:jar:4.1.7.RELEASE:compile [INFO] | +- org.springframework.data:spring-data-jpa:jar:1.7.3.RELEASE:compile [INFO] | | +- org.springframework.data:spring-data-commons:jar:1.9.3.RELEASE:compile [INFO] | | \- org.slf4j:slf4j-api:jar:1.7.12:compile [INFO] | \- org.springframework:spring-aspects:jar:4.1.7.RELEASE:compile [INFO] +- mysql:mysql-connector-java:jar:5.1.36:compile [INFO] +- org.flywaydb:flyway-core:jar:3.1:compile [INFO] +- org.springframework.security.oauth:spring-security-oauth2:jar:2.0.7.RELEASE:compile [INFO] | +- org.springframework:spring-beans:jar:4.1.7.RELEASE:compile [INFO] | +- org.springframework:spring-context:jar:4.1.7.RELEASE:compile [INFO] | +- org.springframework.security:spring-security-core:jar:3.2.8.RELEASE:compile [INFO] | | \- aopalliance:aopalliance:jar:1.0:compile [INFO] | +- org.springframework.security:spring-security-config:jar:3.2.8.RELEASE:compile [INFO] | +- org.springframework.security:spring-security-web:jar:3.2.8.RELEASE:compile [INFO] | +- commons-codec:commons-codec:jar:1.6:compile [INFO] | \- org.codehaus.jackson:jackson-mapper-asl:jar:1.9.13:compile [INFO] | \- org.codehaus.jackson:jackson-core-asl:jar:1.9.13:compile [INFO] +- org.springframework.boot:spring-boot-starter:jar:1.2.6.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot:jar:1.2.6.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-autoconfigure:jar:1.2.6.RELEASE:compile [INFO] | \- org.yaml:snakeyaml:jar:1.14:compile [INFO] +- org.springframework.boot:spring-boot-starter-log4j:jar:1.2.6.RELEASE:compile [INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.7.12:compile [INFO] | +- org.slf4j:jul-to-slf4j:jar:1.7.12:compile [INFO] | +- org.slf4j:slf4j-log4j12:jar:1.7.12:compile [INFO] | \- log4j:log4j:jar:1.2.17:compile [INFO] \- org.springframework.boot:spring-boot-starter-test:jar:1.2.6.RELEASE:compile [INFO] +- junit:junit:jar:4.12:compile [INFO] +- org.mockito:mockito-core:jar:1.10.19:compile [INFO] | \- org.objenesis:objenesis:jar:2.1:runtime [INFO] +- org.hamcrest:hamcrest-core:jar:1.3:compile [INFO] +- org.hamcrest:hamcrest-library:jar:1.3:compile [INFO] \- org.springframework:spring-test:jar:4.1.7.RELEASE:compile
所以，显然问题是logback仍然在classpath中，但我在输出中找不到它所以我不知道问题出在哪里。
你能发现错误吗？ 我很感激你的帮助
编辑
这只发生在我将服务器作为Spring Boot Application运行时。 如果我将它作为java应用程序运行，错误就消失了……任何想法？
我有完全相同的问题，只能看到来自春季启动的依赖。 它还引入了log4j-over-slf4j，这与我自己对slf4j-log4j12的要求发生了冲突。 通过添加以下排除项解决。 这更具体，不包括spring boot日志记录。
org.springframework.boot spring-boot-starter logback-classic ch.qos.logback log4j-over-slf4j org.slf4j
删除引入slf4j-log4j12 spring-boot-starter-log4j的依赖slf4j-log4j12 ，我认为如果你有一些依赖于log4j的代码，你应该使用log4j-over-slf4j 。 请看这里的区别。
您在类路径上使用logback.xml并在您的pom上安装了spring-boot-starter-log4j：jar，这就是为什么要使用StaticLoggerBinder的冲突。
SLF4J: Found binding in [jar:file:/home/jscherman/.m2/repository/ch/qos/logback/logback-classic/1.1.3/logback-classic-1.1.3.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/home/jscherman/.m2/repository/org/slf4j/slf4j-log4j12/1.7.12/slf4j-log4j12-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
请从您的pom中删除其中一个日志记录库，例如spring-boot-starter-log4j以消除冲突。
此错误是由类路径中有多个SLF4J实现引起的。 SLF4J是各种日志框架（例如log4j或logback）的抽象，它通过静态方法检测编译阶段的实现。
从您的依赖：树，我只找到log4j，没有与logback相关的jar
[INFO] +- org.springframework.boot:spring-boot-starter-log4j:jar:1.2.6.RELEASE:compile [INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.7.12:compile [INFO] | +- org.slf4j:jul-to-slf4j:jar:1.7.12:compile [INFO] | +- org.slf4j:slf4j-log4j12:jar:1.7.12:compile [INFO] | \- log4j:log4j:jar:1.2.17:compile
您应该首先尝试运行maven-update项目，然后再次检查。