Hey Guys I am experiencing a crash in my Kotlin application when making Ktor API calls from a librar...

# ktor

[Abhinav Suthar]

Hey Guys
I am experiencing a crash in my Kotlin application when making Ktor API calls from a library module (minify enabled). The application runs fine when the API call code is moved to the main module.
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[Abhinav Suthar]

Error
ApiCallError: Serializer for class 'T' is not found.
Please ensure that class is marked as '@Serializable' and that the serialization compiler plugin is applied.

[Abhinav Suthar]

Steps Taken:

1. Verified all data classes are annotated with @Serializable.
2. Ensured Ktor dependencies are correctly defined in the library's build.gradle.
3. Tested without ProGuard, which worked fine.
4. Isolated Ktor API calls in a minimal test case within the library.

[Abhinav Suthar]

I would appreciate any insights or suggestions on resolving this issue. You can find more details in my GitHub repository: https://github.com/abhinavsuthar/ktor-proguard-issue

[Abhinav Suthar]

This error only occurs when ktor code in library module, works fine when I move the code to app module. Definitely a proguard issue.

[Aleksei Tirman [JB]]

Can you try to use these Proguard rules?

[Abhinav Suthar]

Yes, I have tried adding these rules to all proguard files with no luck

[Abhinav Suthar]

I found a solution
1. Set minify to false in your library
2. Add consumer rules (optional)
3. Publish your library to maven local
4. implement maven local library instead of as a project in you app module
5. Build app with minify enabled