Summary:
## Summary
When an exception is raised by Java in a synchronous call from JS to Java, the Java portion of the stack trace is simply ignored when the exception is forwarded to JS. This problem doesn't exist for async calls. I did some digging to figure out why this works with async calls, but not sync calls, to get to the bottom of T52585087.
In T52585087, `TurboModuleRegistry.get<Spec>('I18nAssets')` fails because of a `NullPointerException` in Java. However, since there's no stack trace associated with the `NullPointerException`, it's hard to diagnose the problem.
## Asynchronous calls
ReactNative's NativeModules thread is a background thread on which we schedule asynchronous NativeModule method invocations. We spawn our background threads in Java using the [`MessageQueueThreadImpl`](https://fburl.com/diffusion/u0vdm5k3). Each thread is associated with a queue on which you can schedule some work. These `MessageQueueThread`s have a [C++ API](https://fburl.com/diffusion/596740d8) that we can use to schedule some work from C++.
NativeModule method invocations in JS produce a C++/Java boundry, because our JS executes C++, which executes the Java NativeModule method. But since the method is asynchronous, instead of invoking it immediately, we wrap it in a C++ lambda and use the C++ API of `MessageQueueThread` to schedule it to be invoked later. Therefore, when it actually invokes, we'll get Java invoking C++, which invokes Java.
When the NativeModule method (implemented in Java) throws an exception, fbjni will convert that exception into a `jni::JniException` and start unwinding the C++ stack. Eventually, this exception will reach the outermost Java/C++ boundry. Typically, at this point, the program would crash, but because we used fbjni to register all our native functions, our `jni::JniException` will automatically be converted into a regular Java exception. This exception will be caught by MessageQueueThreadHandler [here](https://fburl.com/diffusion/c4thoca7), and handled using our ExceptionHandler NativeModule.
## Synchronous calls
In synchronous execution, JS uses a `JSI::HostObject` to call the Java method directly. If the Java method throws an error, because we're using fbjni, that Java exception will be converted to a `jni::JniException` object, which will contain the stack tract of the Java object. However, from what I could gather, Hermes doesn't know about `jni::JniException`. So, simply ignore the stack trace associated with the Java exception, understanding only the exception message. Hence, all synchronous calls into Java only display the JS stack trace. What we really want is to build an platform-agnostic abstraction that understands `jni::JniException` (and whatever its analogue is in iOS, if any) and use that to bridge between Native and JS.
## Temporary Solution
We know that when NativeModules are created, we do a synchronous call from JS to C++ to Java. This synchronous call happens when you do a property access on the `NativeModules` object. Therefore, at the very least, to get to the bottom of T52585087, we could log all exceptions that are thrown whenever a NativeModule is created. This should help us get to the bottom of T52585087.
Reviewed By: mdvacca
Differential Revision: D17126667
fbshipit-source-id: a6fb27aaea094b9559939ddcc260d3a2c6e71492
Summary:
This diff migrates the usages Nullable and NonNull annotations to AndroidX instead of javax.
The purpose of this change is to bring consistency in the annotations used by the core of RN
Reviewed By: makovkastar
Differential Revision: D16054504
fbshipit-source-id: 21d888854da088d2a14615a90d4dc058e5286b91
Summary:
This diff formats the Java class files inside xplat/js/react-native-github. Since google-java-format was enabled in D16071401 we want to codemode the existing code so that users don't have to deal with formatter lint noise at diff-time.
```arc f --paths-cmd 'hg files -I "**/*.java"'```
drop-conflicts
Reviewed By: cpojer
Differential Revision: D16071725
fbshipit-source-id: fc6e3852e45742c109f0c5ac4065d64201c74204
Summary:
Added a flag that checks if TurboModules are enabled, don't expose them to JS via the old module system.
All TurboModules needs to implement TurboModule interface.
Reviewed By: mdvacca
Differential Revision: D13648332
fbshipit-source-id: f22506fe029ac82d56075f5b6962ff2df2e7eaa4
Summary: Added more information to ending tags so that they can be connected with the starting tags.
Reviewed By: mdvacca
Differential Revision: D7121038
fbshipit-source-id: 72d51952955e22a4c8d66c4f9e75a3fd9d34df7f
Summary: This change drops the year from the copyright headers and the LICENSE file.
Reviewed By: yungsters
Differential Revision: D9727774
fbshipit-source-id: df4fc1e4390733fe774b1a160dd41b4a3d83302a
Summary:
Currently, we scan all native modules to see if they implement the OnBatchCompleteListerner. If they do, we add those modules to a list, and when C++ calls OnBactchComplete is called, we execute the callback on each of the modules.
The only native module implementing this callback today is the UIManagerModule. With Fabric, UIManager will also not be a native module anymore. This diff removes all the work done for creating the list and assumes that UIManagerModule is the only place that is interested in OnBatchComplete call - and calls it directly.
Reviewed By: achen1
Differential Revision: D9186651
fbshipit-source-id: 473586b37c2465ccd041985dcdd56132026f34f1
Summary:
When native modules use `LazyReactPackage`, the modules themselves are not initialized. However, they still use the class names, causing the classes to load. This diff removes the need to perform any class loads. Any properties of the classes that are required are now populated in the `ReactModuleInfo` of that class.
Note that this diff itself does not prevent class loading since any references to `*.class` in `LazyReactpackage` needs to be removed in a consequent diff
Reviewed By: achen1
Differential Revision: D8950025
fbshipit-source-id: 80ddf7e1f33bf2af0db1bd262069795de77ec611
Summary:
* Only add the moduleName to the outer marker
* Include module init in the marker time
* Include the WritableNativeArray time in CONVERT_CONSTANTS
* Stop all markers from finally block in case of exception
Reviewed By: kathryngray
Differential Revision: D5031411
fbshipit-source-id: bf86ee3d59f2cb38866afd52e84af5699db1a003
Andres Suarez
masaaki1915
Ramanpreet Nara
David Vacca
Oleksandr Melnykov
Ram N
Héctor Ramos
Aaron Chiu
Michał Gregorczyk
Kathy Gray
Pieter De Baets