getting Exception in native call from JS java.lang.NullPointerException: Attempt to invoke interface method

Question

I was trying to build Native module on React Native and followed the same instruction mention here

03-06 01:12:21.163 17693-17693/com.jafrirn E/unknown:React: Exception in native call from JS
                                                        java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object[] java.util.Collection.toArray()' on a null object reference
                                                            at java.util.ArrayList.addAll(ArrayList.java:188)
                                                            at com.facebook.react.ReactInstanceManagerImpl.createAllViewManagers(ReactInstanceManagerImpl.java:589)
                                                            at com.facebook.react.CoreModulesPackage.createNativeModules(CoreModulesPackage.java:63)
                                                            at com.facebook.react.ReactInstanceManagerImpl.processPackage(ReactInstanceManagerImpl.java:814)
                                                            at com.facebook.react.ReactInstanceManagerImpl.createReactContext(ReactInstanceManagerImpl.java:731)
                                                            at com.facebook.react.ReactInstanceManagerImpl.access$600(ReactInstanceManagerImpl.java:92)
                                                            at com.facebook.react.ReactInstanceManagerImpl$ReactContextInitAsyncTask.doInBackground(ReactInstanceManagerImpl.java:185)
                                                            at com.facebook.react.ReactInstanceManagerImpl$ReactContextInitAsyncTask.doInBackground(ReactInstanceManagerImpl.java:170)
                                                            at android.os.AsyncTask$2.call(AsyncTask.java:295)
                                                            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
                                                            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
                                                            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
                                                            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                            at    java.lang.Thread.run(Thread.java:818)
03-06 01:12:21.257 17693-17720/com.jafrirn W/EGL_emulation:      eglSurfaceAttrib not implemented
03-06 01:12:21.257 17693-17720/com.jafrirn W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xab78f200, error=EGL_SUCCESS

I tried alot but did not work. Thanks in Advance

agenthunt · Accepted Answer · 2016-03-06 09:14:00Z

2

My guess is that you are returning null when implementing the ReactPackage interface methods. Try returning an emptyList.

@Override
public List<Class<? extends JavaScriptModule>> createJSModules() {
    return Collections.emptyList();
}

@Override
public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
    return Collections.emptyList();
}

answered Mar 6, 2016 at 9:14

agenthunt

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