React native doesn't build Android release. Hangs at bundleReleaseJsAndAssets

Description

Upgraded to 0.43.1 and tried running ./gradlew assembleRelease to generate my Android build apk

It just hangs at usually 91…95% for ever.

Reproduction Steps and Sample Code

Do the required signing for the apk and the various tasks in the gradle files explained here : https://facebook.github.io/react-native/docs/signed-apk-android.html

Go to Android folder and run ./gradlew assembleRelease

for reference, i added some helper scripts in my package.json

//top of package.json
//...
"droid:assr": "cd android && ./gradlew assembleRelease && cd ..",
"droid:rel": "react-native run-android --variant=release",
//...
//rest of package.json

Neither react-native run-android --variant=release or ./gradlew assembleRelease works.

Solution

Building from android-studio with gradle works, but it skips bundleReleaseJsAndAssets so it makes the app crash instantly.

Additional Information

• React Native version: 0.43.1
• Platform: Android (Haven’t tried buiding the release build on iOS yet)
• Development Operating System: MacOS
• Dev tools: Mainly coding in vscode, used android-studio(2.3.1) to try to workout around the problem (no success)

[Hindenes]

Had the same issue, but I managed to fix it.

For me, the problem was that I use Realm in my tests, and I didn’t remove the generated realm files after a test run. Removing all Realm files fixed it (rm -rf default.realm* && rm -rf realm-*).

[kulor]

I’ve just found a workaround to my particular problem; removing the realm-object-server directory unblocks the bundleReleaseJsAndAssets step