How to access Gradle internal api from plugins

I was upgrading a custom plugin based on 1.3 to 1.6 but faced the problem accessing Gradle internal api classes. After doing some investigation I found out that it breaks when moving 1.3 to 1.4 or higher.

The class I’m using is org.gradle.api.internal.artifacts.configurations.conflicts.StrictConflictResolution (it still exists in 1.6)

I’ve added the Gradle api via my dependencies block like:

dependencies {

groovy localGroovy()

compile gradleApi()

Is there something changed after 1.3 and what is the best way to include the internal Gradle api in my plugin?

Kind regards, Marcel

The class was moved from ‘core’ to ‘core-impl’, which means that it can no longer be used directly. Why and how are you using this class?

In our custom plugin we defined:


public void apply(Project project) {

// fail on version conflicts

project.configurations.all { resolutionStrategy.failOnVersionConflict() }

and it’s test case I’m verifying this like:

def “configures fail on version conflict resolution strategy for each configuration”() {


project.configurations.all { configuration ->

assert configuration.resolutionStrategy.conflictResolution instanceof StrictConflictResolution



You’ll need to change the test. You can either check the class name, or write a higher-level test that actually tries to resolve conflicting module versions.