android - Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference #53

psyzz · 2016-12-13T22:23:32Z

Hello guys,

i'm trying to build an app i made on iOS to Android, and i have this error at startup:

12-13 17:18:36.483  5384  5384 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at com.audioStreaming.ReactNativeAudioStreamingModule.getClassActivity(ReactNativeAudioStreamingModule.java:43)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at com.audioStreaming.Signal.setData(Signal.java:66)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at com.audioStreaming.ReactNativeAudioStreamingModule.onServiceConnected(ReactNativeAudioStreamingModule.java:78)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1223)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1240)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at android.os.Handler.handleCallback(Handler.java:739)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:95)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:148)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at android.app.ActivityThread.main(ActivityThread.java:5417)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at java.lang.reflect.Method.invoke(Native Method)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
12-13 17:18:36.483  5384  5384 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
12-13 17:18:36.484   816  2166 W ActivityManager:   Force finishing activity com.app/.MainActivity

Do you have any idea?
Thanks!

"react-native-audio-streaming": "^2.2.0",
"react-native": "0.35.0",
"react": "15.3.2"

My MainApplication.java:

package com.app;

import android.app.Application;
import android.support.annotation.NonNull;
import android.util.Log;

import com.facebook.react.ReactApplication;
import com.reactnativenavigation.NavigationApplication;
import com.wog.videoplayer.VideoPlayerPackage;
import com.cmcewen.blurview.BlurViewPackage;
import com.audioStreaming.ReactNativeAudioStreamingPackage;
import com.rnim.rn.audio.ReactNativeAudioPackage;
import com.brentvatne.react.ReactVideoPackage;
import fr.bamlab.rnimageresizer.ImageResizerPackage;
import com.reactnative.ivpusic.imagepicker.PickerPackage;
import com.microsoft.codepush.react.CodePush;
import com.geektime.reactnativeonesignal.ReactNativeOneSignalPackage;
import com.imagepicker.ImagePickerPackage;
import com.RNFetchBlob.RNFetchBlobPackage;
import com.oblador.vectoricons.VectorIconsPackage;
import com.facebook.react.ReactInstanceManager;
import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;

import java.util.Arrays;
import java.util.List;

public class MainApplication extends NavigationApplication {

  @Override
  public boolean isDebug() {
      return BuildConfig.DEBUG;
  }

  @NonNull
  @Override
  public List<ReactPackage> createAdditionalReactPackages() {
      return Arrays.<ReactPackage>asList(
          new VideoPlayerPackage(),
          new BlurViewPackage(),
          new ReactNativeAudioStreamingPackage(),
          new ReactNativeAudioPackage(),
          new ReactVideoPackage(),
          new ImageResizerPackage(),
          new PickerPackage(),
          new CodePush(null, getApplicationContext(), BuildConfig.DEBUG),
          new ReactNativeOneSignalPackage(),
          new ImagePickerPackage(),
          new RNFetchBlobPackage(),
          new VectorIconsPackage()
      );
  }
}

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

Arkanine · 2016-12-16T20:32:13Z

Hi, I have the same issue.

psyzz · 2016-12-16T21:35:13Z

Couldn't find a fix yet :(

tlenclos · 2016-12-16T21:39:32Z

Will look into it this weekend. Do you experience this bug when only including this module ?

psyzz · 2016-12-17T20:32:28Z

Yes, i can't run my app with it, i need to remove ReactNativeAudioStreamingPackage() from MainApplication.java and all related code in android/settings.gradle and android/app/build.gradle to run the app without react-native-audio-streaming

Arkanine · 2016-12-18T14:01:52Z

In my case react-native-audio-streaming module crash the process of react-native-push-notification when i receive remote notification and the app is closed. Another words when the new remote notification arrived, the react-native-push-notification start some process in background and the react-native-audio-streaming crash this process.

The logs looks this way:
AndroidRuntime: FATAL EXCEPTION: main
Process: com.thedevoapp, PID: 32392
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
at com.audioStreaming.ReactNativeAudioStreamingModule.getClassActivity(ReactNativeAudioStreamingModule.java:43)
at com.audioStreaming.Signal.setData(Signal.java:66)
at com.audioStreaming.ReactNativeAudioStreamingModule.onServiceConnected(ReactNativeAudioStreamingModule.java:78)
at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1206)
at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1223)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)

Arkanine · 2016-12-18T17:06:23Z

@arshavinho try to set new ReactNativeAudioStreamingPackage() into MainApplication.java
instead of new ReactNativeAudioStreamingPackage(MainActivity.class).

tlenclos · 2016-12-18T19:07:24Z

I can't manage to reproduce the error but it seems that for some reason the currentActivity could be null in the module. I found some workaround here bourgois/react-native-hockeyapp@224a447 and in the react-native doc http://facebook.github.io/react-native/docs/native-modules-android.html#getting-activity-result-from-startactivityforresult.

If someone want to take a look, or give me access to a public repo with the bug, I could look into it.

psyzz · 2016-12-19T00:44:32Z

@Arkanine i already have new ReactNativeAudioStreamingPackage(); in my MainApplication.java
@tlenclos thanks for your time, when i open my project in Android Studio i have this:

and in ReactNativeAudioStreamingModule.java:

Maybe it's related to react-native-navigation ? For android we need to change or MainApplication.java and MainActivity:

https://github.com/wix/react-native-navigation/wiki/Installation---Android
My MainActivity.java:

package com.appname;

import com.reactnativenavigation.controllers.SplashActivity;

public class MainActivity extends SplashActivity {

}

psyzz · 2016-12-19T01:16:04Z

i modified ReactNativeAudioStreamingModule.java like:

import android.app.Activity;
.
.
.
public Class<?> getClassActivity() {
    Activity currentActivity = getCurrentActivity();
    if (currentActivity == null) {
        // The currentActivity can be null if it is backgrounded / destroyed, so we simply
        // no-op to prevent any null pointer exceptions.
        return null;
    }
    if (this.clsActivity == null) {
      this.clsActivity = getCurrentActivity().getClass();
    }
    return this.clsActivity;
  }

and now the app starts, but when i try to play a sound i get:

12-18 20:13:05.077 11308 11396 E unknown:React: Exception in native call
12-18 20:13:05.077 11308 11396 E unknown:React: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Class.getName()' on a null object reference
12-18 20:13:05.077 11308 11396 E unknown:React: 	at android.content.ComponentName.<init>(ComponentName.java:129)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at android.content.Intent.<init>(Intent.java:4449)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.audioStreaming.Signal.showNotification(Signal.java:175)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.audioStreaming.ReactNativeAudioStreamingModule.playInternal(ReactNativeAudioStreamingModule.java:105)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.audioStreaming.ReactNativeAudioStreamingModule.play(ReactNativeAudioStreamingModule.java:99)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at java.lang.reflect.Method.invoke(Native Method)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.facebook.react.bridge.BaseJavaModule$JavaMethod.invoke(BaseJavaModule.java:318)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.facebook.react.cxxbridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:158)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at android.os.Handler.handleCallback(Handler.java:739)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at android.os.Handler.dispatchMessage(Handler.java:95)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at android.os.Looper.loop(Looper.java:148)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:196)
12-18 20:13:05.077 11308 11396 E unknown:React: 	at java.lang.Thread.run(Thread.java:818)

hugohow · 2017-01-04T09:07:42Z

I have the same bug, does anyone have a solution ?

psyzz · 2017-01-04T22:33:49Z

unfortunately no :(

marcshilling · 2017-01-28T20:01:36Z

Adding <service android:name=".ReactNativeAudioStreaming.Signal" android:enabled="true" /> to my manifest file fixed this issue.

lucasromanojf · 2017-05-25T18:30:38Z

I still have the same issue.

cherniv · 2017-06-12T06:29:02Z

Are you using code-push? Cause in my case this is what causes this bug

psyzz · 2017-06-12T10:38:14Z

@cherniv yes using codepush

cherniv · 2017-06-12T11:07:23Z

I've opened an issue: microsoft/react-native-code-push#872 , but it looks like no one can help, frustrating...

SydneyTR · 2017-10-01T12:27:05Z

Still an issue

arcollector · 2018-06-16T16:41:05Z

add these lines to Signal.java

public void showNotification() {
        if(clsActivity == null) {
            clsActivity = module.getClassActivity();
        }
        ....

Taken from tlenclos#53 (comment)

tlenclos added the bug label Dec 14, 2016

tlenclos mentioned this issue Dec 18, 2016

[Android] ReactNativeAudioStreamingModule.getClassActivity null pointer exception #51

Closed

waskosky added a commit to waskosky/react-native-audio-streaming that referenced this issue Oct 22, 2018

Possible fix to a few Android crash scenarios

d0f7ab7

Taken from tlenclos#53 (comment)

psyzz closed this as completed Apr 18, 2021

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android - Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference #53

android - Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference #53

psyzz commented Dec 13, 2016 •

edited

Arkanine commented Dec 16, 2016

psyzz commented Dec 16, 2016

tlenclos commented Dec 16, 2016

psyzz commented Dec 17, 2016 •

edited

Arkanine commented Dec 18, 2016 •

edited

Arkanine commented Dec 18, 2016

tlenclos commented Dec 18, 2016

psyzz commented Dec 19, 2016 •

edited

psyzz commented Dec 19, 2016 •

edited

hugohow commented Jan 4, 2017 •

edited

psyzz commented Jan 4, 2017

marcshilling commented Jan 28, 2017

lucasromanojf commented May 25, 2017

cherniv commented Jun 12, 2017

psyzz commented Jun 12, 2017

cherniv commented Jun 12, 2017

SydneyTR commented Oct 1, 2017

arcollector commented Jun 16, 2018 •

edited

android - Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference #53

android - Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference #53

Comments

psyzz commented Dec 13, 2016 • edited

Arkanine commented Dec 16, 2016

psyzz commented Dec 16, 2016

tlenclos commented Dec 16, 2016

psyzz commented Dec 17, 2016 • edited

Arkanine commented Dec 18, 2016 • edited

Arkanine commented Dec 18, 2016

tlenclos commented Dec 18, 2016

psyzz commented Dec 19, 2016 • edited

psyzz commented Dec 19, 2016 • edited

hugohow commented Jan 4, 2017 • edited

psyzz commented Jan 4, 2017

marcshilling commented Jan 28, 2017

lucasromanojf commented May 25, 2017

cherniv commented Jun 12, 2017

psyzz commented Jun 12, 2017

cherniv commented Jun 12, 2017

SydneyTR commented Oct 1, 2017

arcollector commented Jun 16, 2018 • edited

psyzz commented Dec 13, 2016 •

edited

psyzz commented Dec 17, 2016 •

edited

Arkanine commented Dec 18, 2016 •

edited

psyzz commented Dec 19, 2016 •

edited

psyzz commented Dec 19, 2016 •

edited

hugohow commented Jan 4, 2017 •

edited

arcollector commented Jun 16, 2018 •

edited