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We have a react-native app (with expo, but not expo-go), where under certain conditions, the following exception appears and the app crashes.
I know, at some point we are passing a String where React-Native expects a Double. I really would like to know where. I tried with debugging the app-debug.apk. But when adding a breakpoint at the method in ReadableNativeArray, the App just hangs and the screen of my device stays black.
Is there any way to find out which value caused this exception? Or which code is responsible for this?
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Double
at com.facebook.react.bridge.ReadableNativeArray.getDouble(ReadableNativeArray.java:92)
at com.facebook.react.bridge.JavaMethodWrapper$4.extractArgument(JavaMethodWrapper.java:64)
at com.facebook.react.bridge.JavaMethodWrapper$4.extractArgument(JavaMethodWrapper.java:60)
at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:356)
at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:146)
at com.facebook.jni.NativeRunnable.run(Native Method)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:27)
at android.os.Looper.loop(Looper.java:223)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl.lambda$startNewBackgroundThread$2(MessageQueueThreadImpl.java:217)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$$ExternalSyntheticLambda1.run(D8$$SyntheticClass:0)
at java.lang.Thread.run(Thread.java:923)
We have a react-native app (with expo, but not expo-go), where under certain conditions, the following exception appears and the app crashes.
I know, at some point we are passing a String where React-Native expects a Double. I really would like to know where. I tried with debugging the app-debug.apk. But when adding a breakpoint at the method in ReadableNativeArray, the App just hangs and the screen of my device stays black.
Is there any way to find out which value caused this exception? Or which code is responsible for this?
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Double
at com.facebook.react.bridge.ReadableNativeArray.getDouble(ReadableNativeArray.java:92)
at com.facebook.react.bridge.JavaMethodWrapper$4.extractArgument(JavaMethodWrapper.java:64)
at com.facebook.react.bridge.JavaMethodWrapper$4.extractArgument(JavaMethodWrapper.java:60)
at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:356)
at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:146)
at com.facebook.jni.NativeRunnable.run(Native Method)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:27)
at android.os.Looper.loop(Looper.java:223)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl.lambda$startNewBackgroundThread$2(MessageQueueThreadImpl.java:217)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$$ExternalSyntheticLambda1.run(D8$$SyntheticClass:0)
at java.lang.Thread.run(Thread.java:923)
1 Answer
Reset to default 0I found a solution:
- Patch
./node_modules/react-native/ReactAndroid/src/main/java/com/facebook/react/bridge/ReadableNativeArray.javaadding more information to the exception:
@Override
public double getDouble(int index) {
Object value = getLocalArray()[index];
try {
return ((Double) getLocalArray()[index]).doubleValue();
} catch (ClassCastException e) {
throw new ClassCastException(
"Value at index " + index + " is not a number: " + value
);
}
}
- Configure your android buildscript to compile React Native from source instead of using prebuilt
aarfiles (see https://reactnative.dev/contributing/how-to-build-from-source), adding:
includeBuild('../node_modules/react-native') {
dependencySubstitution {
substitute(module("com.facebook.react:react-android")).using(project(":packages:react-native:ReactAndroid"))
substitute(module("com.facebook.react:react-native")).using(project(":packages:react-native:ReactAndroid"))
substitute(module("com.facebook.react:hermes-android")).using(project(":packages:react-native:ReactAndroid:hermes-engine"))
substitute(module("com.facebook.react:hermes-engine")).using(project(":packages:react-native:ReactAndroid:hermes-engine"))
}
}
- Build app and run
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