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Provide a helpful error message for gradle duplicate class errors

Open gmackall opened this issue 2 years ago • 5 comments

The error that Gradle throws when it detects that two modules have duplicate classes is not very helpful to a typical flutter developer (see error at the end).

Pieces of information that would be helpful to include:

  1. examples of how to exclude one of the two modules (this is sometimes the solution), e.g. Add the following to the android{} section of your android/app/build.gradle:
configurations {
        implementation.exclude module:'example_module_name'
}

  1. Instructions on how to run ./gradlew app:dependencies to identify which top level modules these dependencies are coming from.

  2. A grep that would do the above and highlight the particular problematic modules, e.g. this one from @reidbaker

./gradlew dependencies | { grep --color -E 'module_A' -q; grep --color -E 'module_B' -q } && echo "module_A and module_B are known to confict. Run \`gradlew dependencies | grep --color -E 'module_A|module_B|$'\` and find which dependencies conflict to either remove or suppress conflicting classes. See EXAMPLE_ISSUE for more details" || echo 'Unfortunately we were not able to detect a known issue.'

Example output from such a failure.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkDebugDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
   > Duplicate class com.google.protobuf.AbstractMessageLite found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
     Duplicate class com.google.protobuf.AbstractMessageLite$Builder found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
     Duplicate class com.google.protobuf.AbstractMessageLite$Builder$LimitedInputStream found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
     Duplicate class com.google.protobuf.AbstractParser found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
     Duplicate class com.google.protobuf.AbstractProtobufList found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
     Duplicate class com.google.protobuf.BooleanArrayList found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
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     Duplicate class com.google.protobuf.ByteOutput found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
     Duplicate class com.google.protobuf.ByteString found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
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     Duplicate class com.google.protobuf.ByteString$BoundedByteString found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
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     Duplicate class com.google.protobuf.ByteString$LeafByteString found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
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     Duplicate class com.google.protobuf.CodedOutputStream$ByteOutputEncoder found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
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     Duplicate class com.google.protobuf.FieldSet found in modules jetified-protobuf-javalite-3.21.7 (com.google.protobuf:protobuf-javalite:3.21.7) and jetified-protobuf-lite-3.0.1 (com.google.protobuf:protobuf-lite:3.0.1)
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     Go to the documentation to learn how to <a href="d.android.com/r/tools/classpath-sync-errors">Fix dependency resolution errors</a>.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
Running Gradle task 'assembleDebug'...                           2,536ms
Exception: Gradle task assembleDebug failed with exit code 1

gmackall avatar Jul 14 '23 00:07 gmackall

An example issue where a user ran into this issue when trying to use firebase and espresso plugins together: https://github.com/flutter/flutter/issues/119252

gmackall avatar Jul 14 '23 00:07 gmackall

Also cc @reidbaker , I no longer believe this is possible in flutter analyze --suggestions, because it doesn't have access to the error message.

Unless we tried to invoke the gradle task, and then caught the error from there, but then we would require that flutter analyze --suggestions attempts an android build which seems like a big change. Do you have any thoughts?

gmackall avatar Jul 14 '23 00:07 gmackall

@christopherfujino what do you think about having analyze build the android project?

reidbaker avatar Jul 14 '23 15:07 reidbaker

@christopherfujino what do you think about having analyze build the android project?

I agree this seems like a big change. Also, what would the implementation look like? Would we just try to build each native platform, and report failures?

Alternatively, would it be feasible to run some kind of gradle linter? This is the first I found from a google search: https://github.com/nebula-plugins/gradle-lint-plugin/wiki. Looks like to use this plugin, it would need to be added to the project's build.gradle.

christopherfujino avatar Jul 14 '23 16:07 christopherfujino

Another option would be to use this package https://github.com/tehlers/gradle-duplicate-classes-check

reidbaker avatar Jul 14 '23 17:07 reidbaker

This issue is missing a priority label. Please set a priority label when adding the triaged-tool label.

flutter-triage-bot[bot] avatar Jul 14 '23 23:07 flutter-triage-bot[bot]