java - SLF4J: Class path contains multiple SLF4J bindings. multiple logback-classic jars -


i bulding , run spring web app using gradle. there multiple bindings. reading existing posts, found lots of similar problems. have 2 problems. (1) can not find conflict depencies. (2) not fimilar gradle syntaxt. tried lots of methods. still confused. welcome. thanks. here error:

slf4j: class path contains multiple slf4j bindings.

slf4j: found bindings in [jar:file:/c:/myproject/gradle-2.3-all/gradle-2.3/lib/logback-classic-1.0.13.jar!/org/slf4j/impl/statloggerbinder.class]

slf4j: found bindings in [jar:file:/c:/myproject/myproject/build/temp/tomcatrunwar/work/tomcat/localhost/myproject/web-inf/lib/logback-classic-1.1.2.jar!/org/slf4j/impl/statloggerbinder.class]

slf4j: actual binding of type [ch.qos.logback.classic.util.contextselectorstaticbinder]

below depencies:

buildscript { repositories {     maven { url "http://repo.spring.io/libs-release" }     mavenlocal() } dependencies {     classpath("org.springframework.boot:spring-boot-gradle-plugin:1.0.1.release")     classpath 'org.gradle.api.plugins:gradle-tomcat-plugin:1.2.4' }}   apply plugin: 'java' apply plugin: 'eclipse' apply plugin: 'spring-boot' apply plugin: 'war' apply plugin: 'groovy' apply plugin: 'tomcat'   eclipse { jdt {     sourcecompatibility = 1.8     targetcompatibility = 1.8 }}  jar { basename = 'myproject' version =  '0.1.0' }  repositories { mavencentral() maven { url "http://repo.spring.io/libs-release" } }  dependencies { compile('commons-fileupload:commons-fileupload:1.3.1') compile("org.codehaus.jackson:jackson-mapper-asl:1.9.0") compile("org.springframework.boot:spring-boot-starter-web") compile("org.springframework.data:spring-data-mongodb") compile("org.springframework.security:spring-security-crypto:3.2.3.release") compile("com.fasterxml.jackson.core:jackson-databind") compile("joda-time:joda-time:2.2") compile("org.apache.directory.studio:org.apache.commons.codec:1.6") compile('com.amazonaws:aws-java-sdk:1.2.1') testcompile("junit:junit")     runtime 'javax.servlet:jstl:1.2' providedcompile group:"org.apache.tomcat", name:"tomcat-catalina", version:"7.0.47" }   dependencies {  def tomcatversion = '7.0.47'  tomcat "org.apache.tomcat.embed:tomcat-embed-core:${tomcatversion}",  "org.apache.tomcat.embed:tomcat-embed-logging-log4j:${tomcatversion}"  tomcat("org.apache.tomcat.embed:tomcat-embed-jasper:${tomcatversion}") {  exclude group: 'org.eclipse.jdt.core.compiler', module: 'ecj'  } }   tomcatrun { daemon = true  httpport = 8080 outputfile = file('/logs/tomcat.log') stopkey = 'ctl-d' webdefaultxml = file('src/main/webapp/web-inf/web.xml')  }   tomcatrunwar { outputfile = file('/logs/tomcat.log')  } tomcatstop { stopkey = 'ctl-d'  }

start doing on command line: 

gradle dependencies > foo.txt

and go coffee while completes. resulting file contain full dependency tree. search logback.

then when you're modifying build file, far can tell (i'm relatively new @ gradle too), need exclude either module or group, not both. group part before colon, module part after.

looking again @ details of error, think problem contained in here: 

"org.apache.tomcat.embed:tomcat-embed-logging-log4j:${tomcatversion}"

so think should break out own line/dependency , put exclude there.


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