IssueTracker

Component used:lifecycle-viewmodel

Version used: 2.6.0-alpha02

In this bug, version constraints were introduced in lifecycle dependencies to help reduce the likelihood of having conflicting lifecycle versions on the classpath.

It appears however, that the constraints in the latest version of lifecycle-viewmodel itself introduces a version conflict.

Running the gradle dependencies command on a module containing it yields the following:

+--- project :app (*)
+--- androidx.activity:activity-compose:1.3.1
|    +--- androidx.activity:activity-ktx:1.3.1
|    |    +--- androidx.activity:activity:1.3.1
|    |    |    +--- androidx.annotation:annotation:1.1.0 -> 1.2.0
|    |    |    +--- androidx.core:core:1.1.0 -> 1.7.0 (*)
|    |    |    +--- androidx.lifecycle:lifecycle-runtime:2.3.1 -> 2.6.0-alpha02 (*)
|    |    |    +--- androidx.lifecycle:lifecycle-viewmodel:2.3.1 -> 2.6.0-alpha02
|    |    |    |    +--- androidx.annotation:annotation:1.1.0 -> 1.2.0
|    |    |    |    +--- org.jetbrains.kotlin:kotlin-stdlib:1.7.10 (*)
|    |    |    |    +--- androidx.lifecycle:lifecycle-viewmodel-ktx:{androidx.LibraryVersions.LIFECYCLE} -> 2.3.1 (c)
|    |    |    |    \--- androidx.lifecycle:lifecycle-viewmodel-savedstate:2.6.0-alpha02 (c)

In this line

androidx.lifecycle:lifecycle-viewmodel-ktx:{androidx.LibraryVersions.LIFECYCLE} -> 2.3.1 (c)

lifecycle-viewmodel-ktx has a version constraint to 2.3.1.

The result is, in any project with the following lines added to their app dependencies:

    implementation "androidx.lifecycle:lifecycle-viewmodel:2.6.0-alpha02"
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.6.0-alpha02"

Will see the following build failure:

Execution failed for task ':app:checkDebugDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
   > Duplicate class androidx.lifecycle.ViewModelLazy found in modules lifecycle-viewmodel-2.6.0-alpha02-runtime (androidx.lifecycle:lifecycle-viewmodel:2.6.0-alpha02) and lifecycle-viewmodel-ktx-2.3.1-runtime (androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1)
     Duplicate class androidx.lifecycle.ViewTreeViewModelKt found in modules lifecycle-viewmodel-2.6.0-alpha02-runtime (androidx.lifecycle:lifecycle-viewmodel:2.6.0-alpha02) and lifecycle-viewmodel-ktx-2.3.1-runtime (androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1)