Java lang nullpointerexception iterator

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java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.lang.Iterable.iterator()’ on a null object reference #2786

java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.lang.Iterable.iterator()’ on a null object reference #2786

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"react": "16.8.6", "react-native": "0.58.5", react-native-maps: 0.23.0 

It is happening in Android native side. Application crashed in a class named AirMapPolyline.java
at com.google.android.gms.maps.model.PolylineOptions.addAll(Unknown Source)

It happenned when I want to draw a polyline. It works in Ios, however it does not work in android
Is there any solution ?

The text was updated successfully, but these errors were encountered:

For anyone that comes across this issue it is not a bug.

The error is thrown whenever a Polyline or Polygon is given passed undefined to the coordinates prop.

Use something like .filter() to remove any undefined items before trying to render them and the error will be eliminated.

Someone just emailed me asking for further explanation, this was my response:

Polyline or Polygon elements expect an array of LatLng objects, like this:

Now if instead of a LatLng object you have an element which is undefined, like this:

This will create an error.

To eliminate the error, you could do something like this:

// identity when used as a predicate coerces undefined or null values to false

const identity = item => item

const filteredData = data.filter(identity)

No more null object reference 🙂

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java.lang.NullPointerException: Attempt to invoke virtual method ‘java.util.Iterator java.util.ArrayList.iterator()’ on a null object reference [ANDROID] #384

java.lang.NullPointerException: Attempt to invoke virtual method ‘java.util.Iterator java.util.ArrayList.iterator()’ on a null object reference [ANDROID] #384

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When I use it on Android the app crashes and I’ve got this error from logcat

 Process: com.******, PID: 18659 java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.Iterator java.util.ArrayList.iterator()' on a null object reference at com.wenkesj.voice.VoiceModule.onResults(VoiceModule.java:348) at android.speech.SpeechRecognizer$InternalListener$1.handleMessage(SpeechRecognizer.java:459) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:223) at android.app.ActivityThread.main(ActivityThread.java:7664) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)``` 

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java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.util.List.iterator()’ on a null object reference #1020

java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.util.List.iterator()’ on a null object reference #1020

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Step 1: Describe your environment

• Android device: OnePlus 7 Pro (GM1913)
• Android OS version: 10
• Google Play Services version: 19.6.29
• Firebase/Play Services SDK version: 19.2.0

Step 2: Describe the problem:

Trying to save Object to Firebase DB

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference 0 = "java.lang.reflect.Method.invoke(Native Method)" 1 = "com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@19.2.0:657)" 2 = "com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@19.2.0:167)" 3 = "com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertToPlainJavaTypes(com.google.firebase:firebase-database@@19.2.0:60)" 4 = "com.google.firebase.database.DatabaseReference.setValueInternal(com.google.firebase:firebase-database@@19.2.0:282)" 5 = "com.google.firebase.database.DatabaseReference.setValue(com.google.firebase:firebase-database@@19.2.0:159)" 

Steps to reproduce:

Reproduced on Emulator with Android 10 also

Observed Results:

Relevant Code:

DatabaseReference db = FirebaseDatabase.getInstance().getReference(); db.child("profile").child("name@last").setValue(userProfileObj) 

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java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.util.List.iterator()’ on a null object reference #51

java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.util.List.iterator()’ on a null object reference #51

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java.lang.RuntimeException: Unable to create application com.stub.StubApp: java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.util.List.iterator()’ on a null object reference
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5677)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1637)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)
Caused by: java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.util.List.iterator()’ on a null object reference
at xiaofei.library.hermeseventbus.HermesEventBus.b(SourceFile)
at xiaofei.library.hermeseventbus.HermesEventBus.a(SourceFile)
at xiaofei.library.hermeseventbus.HermesEventBus.init(SourceFile)
at com.****.Application.onCreate(SourceFile)
at com.stub.StubApp.onCreate(SourceFile:111)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1028)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5658)
. 8 more
java.lang.NullPointerException: Attempt to invoke interface method ‘java.util.Iterator java.util.List.iterator()’ on a null object reference
at xiaofei.library.hermeseventbus.HermesEventBus.b(SourceFile)
at xiaofei.library.hermeseventbus.HermesEventBus.a(SourceFile)
at xiaofei.library.hermeseventbus.HermesEventBus.init(SourceFile)
at com..****Application.onCreate(SourceFile)
at com.stub.StubApp.onCreate(SourceFile:111)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1028)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5658)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1637)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:6523)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)

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