React Native Android fails with Desugaring enabled about react-native HOT 6 CLOSED

@AndersonVanzo
you are facing this issue because desugring rewrites java.util.OptionalInt to j$.util.OptionalInt which will fail on any JNI binding from native code.

I see your device spec says android 7.0 firmware is available, you could try update it 7.0 and raise minsdkVersion.

you could also try with com.android.tools:desugar_jdk_libs_minimal:2.0.4 instead of coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4' and make sure it works on device, most probably it wont

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⚠️ Newer Version of React Native is Available!
ℹ️ You are on a supported minor version, but it looks like there's a newer patch available - 0.74.3. Please upgrade to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.

The reproducer was made with RN 0.74.3 and the problem still exists

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@AndersonVanzo is it possible to bump your minSdkVersion to 24 reproducer app starts with this change alone

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@netmaxt3r I can't change minSdkVersion to 24 because the target device (this one) uses Android 6.0 (SDK 23)

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The answer provided by @netmaxt3r is excellent!

We don't support this out of the box, plus we're also about to bump the minSdk to 24 in an upcoming version of RN (see react-native-community/discussions-and-proposals#802).

What I can reccomend to try @AndersonVanzo is to:

1. Switch to build from source https://reactnative.dev/contributing/how-to-build-from-source
2. Remove the OptionalInt parameter from those places:
   

   react-native/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/CxxInspectorPackagerConnection.java

   Line 50 in 818dd92

   public native void didFailWithError(OptionalInt posixCode, String error);

   
   

   react-native/packages/react-native/ReactAndroid/src/main/jni/react/devsupport/JCxxInspectorPackagerConnectionWebSocketDelegate.h

   Line 32 in 818dd92

   jni::alias_ref<JOptionalInt::javaobject> posixCode,

   
   (you'll also have to update all the callsites).

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