[GRADLE-2516] Using gradleApi() may lead to classpaths with conflicting jar versions Created: 10/Oct/12  Updated: 10/Feb/17  Resolved: 10/Feb/17

Status: Resolved
Project: Gradle
Affects Version/s: None
Fix Version/s: None

Type: Bug
Reporter: Szczepan Faber Assignee: Unassigned
Resolution: Won't Fix Votes: 4


gradleApi() dependency does not participate in conflict resolution with other dependencies. Example:

apply plugin: 'java'

repositories {

dependencies {
  compile gradleApi()
  //in reality, commons-lang may be pulled in as some transitive dependency
  compile 'commons-lang:commons-lang:2.4'

task printDeps << {
  def deps = configurations.compile.files*.name.sort()
  deps.each { println it }  
  //will show 2 different versions of commons-lang jar

Actually, this problem applies to any kind of self-resolving dependencies (like files('some.jar')) merged in a single configuration with repository-resolvable dependencies. In case of a user consciously choosing self-resolving deps as means of managing dependencies it is his problem to deal with duplicate jars. However, a plugin developer who uses gradleApi() and some external dependencies (like: 'commons-lang:commons-lang:x), he should not have to worry about the duplicate jars.

Comment by David M. Karr [ 31/Mar/15 ]

I don't know if this is related, but I see issues related to this even if I don't include the "gradleApi" dependency. I had it originally, but I removed it. I'm still getting Gradle including the "commons-io" 1.4 jar from the Gradle distribution (not from my Gradle cache). This makes my dependency on commons-io 2.4 useless. I don't even see "commons-io 1.4" in the "gradle dependencies" output.

To fix this in my code, I had to manually copy several classes from commons-io 2.4 into my codebase, renaming them and changing references. This is not a reasonable solution, but it's the only thing I can do right now to get this working.

Comment by Benjamin Muschko [ 15/Nov/16 ]

As announced on the Gradle blog we are planning to completely migrate issues from JIRA to GitHub.

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We look forward to collaborating with you more closely on GitHub. Thank you for your contribution to Gradle!

Comment by Benjamin Muschko [ 10/Feb/17 ]

Thanks again for reporting this issue. We haven't heard back from you after our inquiry from November 15th. We are closing this issue now. Please create an issue on GitHub if you still feel passionate about getting it resolved.

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