i am facing some weird exception stack traces when i enable minification. The weird thing is that it happens only inside setContent.

release {
      isDebuggable = false
      isMinifyEnabled = true
      isShrinkResources = true
      proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
      signingConfig = signingConfigs.getByName(signingCfg)
    }

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContent {
      throw InvalidClassException("Test Exception")
      LDAContent()
    }
  }

This code outputs something like:

Caused by: java.io.InvalidClassException: Test Exception
                    at g4.a.h(Unknown Source:31)
                    at h0.c.h(Unknown Source:53)
                    at androidx.compose.ui.platform.k1.a(Unknown Source:24)
                    at s.l0.h(Unknown Source:163)
                    at h0.c.h(Unknown Source:53)
                    at y9.z.b(Unknown Source:151)
                    at androidx.compose.ui.platform.l1.a(Unknown Source:282)
                    at y.v.a(Unknown Source:38)
                    at y.v.h(Unknown Source:15)
                    at h0.c.h(Unknown Source:53)
                    at y9.z.b(Unknown Source:151)
                    at androidx.compose.ui.platform.w0.a(Unknown Source:484)
                    at androidx.compose.ui.platform.f3.a(Unknown Source:170)
                    at androidx.compose.ui.platform.f3.h(Unknown Source:27)
                    at h0.c.h(Unknown Source:53)
                    at y9.z.a(Unknown Source:216)
                    at androidx.compose.ui.platform.f3.a(Unknown Source:144)
                    at androidx.compose.ui.platform.f3.h(Unknown Source:15)
                    at h0.c.h(Unknown Source:53)
                    at d5.a.O(Unknown Source:14)
                    at a0.q.q(Unknown Source:117)
                    at a0.q.k(Unknown Source:10)
                    at a0.x.n(Unknown Source:33)
                    at a0.e2.a(Unknown Source:33)
                    at a0.x.o(Unknown Source:8)
                    at a0.x.g(Unknown Source:2)
                    at androidx.compose.ui.platform.g3.invoke(SourceFile:24)
                    at androidx.compose.ui.platform.AndroidComposeView.setOnViewTreeOwnersAvailable(Unknown Source:6)
                    at androidx.compose.ui.platform.WrappedComposition.g(Unknown Source:8)

If i throw the exception outside of setContent, i get a readable exception.

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    throw InvalidClassException("Test Exception") // I get a proper exception stack trace
    setContent {   
      LDAContent()
    }
  }

I have tried to update all compose related dependencies, currently i use:

agp = 8.2.0
kotlinCompilerExtensionVersion = "1.5.12"
kotlin = 1.9.23

But without any luck. The only way how to “fix” this is to set isMinifyEnabled = false.

It seems like some exception related to R8/ Proguard.