How do I write this Maven exclusion code in Gradle?

Question

I'm trying to use the latest (master) version of Betamax in a Spring Boot project, and I'm getting the error SLF4J: Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting StackOverflowError..

So I looked at the top answer to this question, and it says to exclude conflict dependencies by doing this:

<exclusions>
  <exclusion> 
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
  </exclusion>
  <exclusion> 
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
  </exclusion>
</exclusions> 

But my project uses Gradle, so I have to convert that to Gradle, and I really don't know what I'm doing. I looked at this post and tried messing around with it like

dependencies {
    ...
    compile('org.slf4j') {
        exclude module: 'slf4j-log4j12'
    }
}

but nothing seems to work. Can anyone help me figure out the right syntax? I'd really appreciate any help.

If it helps at all, my dependencies block currently looks like this:

dependencies {
    testCompile 'org.springframework.boot:spring-boot-starter-test:1.2.1.RELEASE'
    testCompile 'org.codehaus.groovy:groovy-all:2.3.3'
    testCompile 'co.freeside.betamax:betamax-proxy:2.0-SNAPSHOT'
    testCompile 'co.freeside.betamax:betamax-junit:2.0-SNAPSHOT'
    compile 'org.springframework.boot:spring-boot-starter-log4j2:1.2.1.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-web:1.2.1.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-data-jpa:1.2.1.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-tomcat:1.2.1.RELEASE'
    compile 'org.apache.tomcat.embed:tomcat-embed-jasper'
    compile 'com.domingosuarez.boot:spring-boot-starter-jade4j:0.2'
    compile 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.4.0'
    compile 'com.mashape.unirest:unirest-java:1.4.5'
    runtime 'mysql:mysql-connector-java:5.1.34'
    runtime 'net.kencochrane.raven:raven-log4j2:6.0.0'
}

Answer 1

The right syntax is :

dependencies {
    compile("org.gradle.test.excludes:api:1.0") {
        exclude group: "org.springframework", module: "spring-core"
    }
}

Where:

• org.gradle.test.excludes:api:1.0 is a groupId:artifactId:version
• group: "org.springframework", module: "spring-core" is a group: groupId, module: artifactId

Answer 2

Thanks for your help, guys. I was able to fix the error by following Don Bottstein's advice and doing this:

testCompile('co.freeside.betamax:betamax-proxy:2.0-SNAPSHOT') {
    exclude module: 'slf4j-log4j12'
}
testCompile('co.freeside.betamax:betamax-junit:2.0-SNAPSHOT') {
    exclude module: 'slf4j-log4j12'
}