NativeRunnable.java: Failed to create String from JSON

[npomfret]

Got the following error in a production deployment which crashed my app. Anyone know what it means?

RN 0.29.2
Android 6

Fatal Exception: java.lang.RuntimeException: Failed to create String from JSON
       at com.facebook.react.bridge.queue.NativeRunnable.run(NativeRunnable.java)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
       at android.os.Looper.loop(Looper.java:234)
       at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:193)
       at java.lang.Thread.run(Thread.java:818)

[npomfret]

Same on android 5, RN 0.30

E/unknown:React: Exception in native call from JS
                                                             com.facebook.react.devsupport.JSException: Failed to create String from JSON
                                                                 at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
                                                                 at android.os.Handler.handleCallback(Handler.java:815)
                                                                 at android.os.Handler.dispatchMessage(Handler.java:104)
                                                                 at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
                                                                 at android.os.Looper.loop(Looper.java:194)
                                                                 at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:196)
                                                                 at java.lang.Thread.run(Thread.java:818)
                                                              Caused by: com.facebook.jni.CppException: Failed to create String from JSON
                                                                 at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method) 
                                                                 at android.os.Handler.handleCallback(Handler.java:815) 
                                                                 at android.os.Handler.dispatchMessage(Handler.java:104) 
                                                                 at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31) 
                                                                 at android.os.Looper.loop(Looper.java:194) 
                                                                 at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:196) 
                                                                 at java.lang.Thread.run(Thread.java:818)

[GeoffreyPlitt]

Same here

[GeoffreyPlitt]

Maybe JSON.parse() is the culprit? Maybe the parsing happens in native-land?

[GeoffreyPlitt]

Any ideas?

[leeight]

Could you try it on the master branch? If you can reproduce it, you'll get the invalid JSON.

[GeoffreyPlitt]

@leeight Thanks, but I don't understand your suggestions at all.

Master branch? What do you mean? We're not using a non-master branch, what indicated that to you?

Invalid JSON: No, the whole problem is we have no way of knowing what the invalid JSON is. I'm not sending any JSON anywhere, this is deep in the RN codebase, it's happening in NativeRunnable.run(). I would absolutely LOVE if I could see the offending JSON, because then I would not be 100% stuck with this error.

[leeight]

@GeoffreyPlitt

This commit will print the invalid JSON If failed.
9a7e4b4

[GeoffreyPlitt]

@leeight Awesome, that helps, thanks!

[GeoffreyPlitt]

We can close this since 0.35 is out, thanks!

[brentvatne]

Closing this and moving discussion to #10756