* when no variants from the producer match the consumer attributes (incompatibility error)

[[sub:variant-ambiguity]]
=== Dealing with ambiguity errors

An ambiguous variant selection looks like the following:

[listing]
----
> Could not resolve all files for configuration ':compileClasspath'.
   > Could not resolve project :lib.
     Required by:
         project :ui

        } as Action)

        when:
        server.stubListFile(temporaryFolder.testDirectory, bucketName)

        then:
        def listing = s3Client.listDirectChildren(new URI("s3://${bucketName}/maven/release/"))
        listing as Set == ([FILE_NAME] + directSubdirectories) as Set

        where:
        authenticationImpl | authenticationType
        awsCredentials     | "authenticated"

[listing]
----
$ ./gradlew publishPlugins
----

You can validate your plugins before publishing using the `--validate-only` flag:

[listing]
----
$ ./gradlew publishPlugins --validate-only
----

If you have not configured your `gradle.properties` for the {portal}, you can specify them on the command-line:

[listing]
----

	//
	// gomaxprocs isn't used directly so as to keep this structure unit-testable.
	nprocs int32
}

// limiting returns true if the CPU limiter is currently enabled, meaning the Go GC
// should take action to limit CPU utilization.
//
// It is safe to call concurrently with other operations.
func (l *gcCPULimiterState) limiting() bool {
	return l.enabled.Load()
}

// startGCTransition notifies the limiter of a GC transition.
//

    }

    private List<ModuleComponentResolveState> sortLatestFirst(Collection<? extends ModuleComponentResolveState> listing) {
        return CollectionUtils.sort(listing, Collections.reverseOrder(versionComparator));
    }

    private static class DynamicArtifactResolutionDetails implements ArtifactResolutionDetails {

)

// ListRequest is a structure containing fields
// and options for listing keys.
type ListRequest struct {
	// Prefix is an optional prefix for filtering names.
	// A list operation only returns elements that match
	// this prefix.
	// An empty prefix matches any value.
	Prefix string

	// ContinueAt is the name of the element from where
	// a listing should continue. It allows paginated
	// listings.
	ContinueAt string

func TestCreateTwice(t *testing.T) {
	dir := t.TempDir()
	testCreate(t, dir)
	testCreate(t, dir)
}

// Test that we can create an archive, put some files in it, and get back a correct listing.
// Tests the tv command.
func TestTableOfContents(t *testing.T) {
	dir := t.TempDir()
	name := filepath.Join(dir, "pack.a")
	ar := openArchive(name, os.O_RDWR|os.O_CREATE, nil)

	// Add some entries by hand.

The `init` task uses the (also built-in) `wrapper` task to create a Gradle wrapper script, `gradlew`.

The first step is to create a folder for the new project and change directory into it.

[listing.terminal.sample-command]
----
\$ mkdir demo
\$ cd demo
----

== Run the init task

From inside the new project directory, run the `init` task using the following command in a terminal: `gradle init`.

	zipPath, _, err := splitZipExtensionPath(prefix)
	if err != nil {
		// Return empty listing
		return ListObjectsV2Info{}, nil
	}

	zipObjInfo, err := objectAPI.GetObjectInfo(ctx, bucket, zipPath, ObjectOptions{})
	if err != nil {
		// Return empty listing
		return ListObjectsV2Info{}, nil
	}

	zipInfo := zipObjInfo.ArchiveInfo(h)
	if len(zipInfo) == 0 {

Run a build twice without enabling the Gradle build cache.
The expected outcome is that all actionable tasks that produce file outputs are up-to-date.
You should see something like this on the command-line:

[listing]
----
$ ./gradlew clean --quiet <1>
$ ./gradlew assemble <2>

BUILD SUCCESSFUL
4 actionable tasks: 4 executed

$ ./gradlew assemble <3>

BUILD SUCCESSFUL
4 actionable tasks: 4 up-to-date
----