log4j:log4j:1.2.16 FAILED
   Failures:
      - Could not resolve log4j:log4j:1.2.16.
          - Module 'log4j:log4j' has been rejected:
               Cannot select module with conflict on capability 'log4j:log4j:1.2.16' also provided by [org.slf4j:log4j-over-slf4j:1.7.10(compile)]

log4j:log4j:1.2.16 FAILED
\--- org.apache.zookeeper:zookeeper:3.4.9
     \--- compileClasspath

org.slf4j:log4j-over-slf4j:1.7.10 FAILED
   Failures:
      - Could not resolve org.slf4j:log4j-over-slf4j:1.7.10.
          - Module 'org.slf4j:log4j-over-slf4j' has been rejected:
               Cannot select module with conflict on capability 'log4j:log4j:1.7.10' also provided by [log4j:log4j:1.2.16(compile)]

org.slf4j:log4j-over-slf4j:1.7.10 FAILED
\--- compileClasspath

org.slf4j:slf4j-log4j12:1.6.1
   variant "compile" [
      org.gradle.status              = release (not requested)
      org.gradle.usage               = java-api
      org.gradle.libraryelements     = jar (compatible with: classes)
      org.gradle.category            = library

      Requested attributes not found in the selected variant:
         org.gradle.dependency.bundling = external
         org.gradle.jvm.environment     = standard-jvm
         org.gradle.jvm.version = 11
   ]

org.slf4j:slf4j-log4j12:1.6.1
\--- org.apache.zookeeper:zookeeper:3.4.9
     \--- compileClasspath

A web-based, searchable dependency report is available by adding the --scan option.
