问题描述：

引入多个 dependency 后可能会出现依赖冲突，如：

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SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/admin/.m2/repository/org/slf4j/slf4j-log4j12/1.6.4/slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/admin/.m2/repository/org/slf4j/slf4j-log4j12/1.6.1/slf4j-log4j12-1.6.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
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Caused by: org.apache.catalina.LifecycleException: Failed to start component [NonLoginAuthenticator[StandardEngine[Tomcat].StandardHost[localhost].TomcatEmbeddedContext[]]]
	at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440) [tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198) [tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.core.StandardPipeline.startInternal(StandardPipeline.java:176) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5063) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_261]
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) ~[na:1.8.0_261]
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
	... 29 common frames omitted
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.getVirtualServerName()Ljava/lang/String;
	at org.apache.catalina.authenticator.AuthenticatorBase.startInternal(AuthenticatorBase.java:1220) ~[tomcat-embed-core-9.0.29.jar:9.0.29]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) [tomcat-embed-core-9.0.29.jar:9.0.29]
	
......

The method's class, javax.servlet.ServletContext, is available from the following locations:

    jar:file:/Users/wangshuo/.gradle/caches/modules-2/files-2.1/javax.servlet/servlet-api/2.5/5959582d97d8b61f4d154ca9e495aafd16726e34/servlet-api-2.5.jar!/javax/servlet/ServletContext.class
    jar:file:/Users/wangshuo/.gradle/caches/modules-2/files-2.1/org.apache.tomcat.embed/tomcat-embed-core/9.0.29/207dc9ca4215853d96ed695862f9873001f02a4b/tomcat-embed-core-9.0.29.jar!/javax/servlet/ServletContext.class

解决：

看报错找到冲突的包，exclude

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dependencies {
    compile 'com.youdao.analysis:json-utils:1.0.2'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    compileOnly 'org.projectlombok:lombok'
    annotationProcessor 'org.projectlombok:lombok'
    compile 'com.youdao.analysis:http-utils:1.1.0'
    compile 'com.youdao.analysis:outlog-shade:3.2.7-2-g0aeb335-3'
    implementation 'com.googlecode.log4jdbc:log4jdbc:1.2'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
    compile 'io.springfox:springfox-swagger2:2.8.0'
    compile 'io.springfox:springfox-swagger-ui:2.8.0'
    compile('org.apache.hadoop:hadoop-common:2.8.5'){
        exclude module: 'servlet-api'
    }
    compile('org.apache.hadoop:hadoop-yarn-client:2.8.5'){
        exclude module: 'servlet-api'
    }
}

configurations.all {
    exclude module: 'slf4j-log4j12'
}

参考：

解决Gradle中jar冲突

Gradle 依赖&解决依赖冲突


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