Attempt to invoke virtual method 'void com.marianhello.bgloc.LocationService.start()' on a null object reference

[Yusiro85]

Your Environment

Plugin version: 0.5.0-alpha.34
Platform: Android
OS version: 7.0
Device manufacturer and model: Huawei VIE-L29
React Native version: 0.51.0
Plugin configuration options:
BackgroundGeolocation.configure({
distanceFilter: 50,
debug: false,
startOnBoot: false,
stationaryRadius: 50,
stopOnTerminate: true,
desiredAccuracy: 10,
interval: 15000
});
Link to your project:

Context

Expected Behavior

Launch the app and run without issue, start tracking location

Actual Behavior

Crash after launch and login the app

Possible Fix

Steps to Reproduce

Context

Debug logs

java.lang.NullPointerException Attempt to invoke virtual method 'void com.marianhello.bgloc.LocationService.start()' on a null object reference
BackgroundGeolocationFacade.java:451 com.marianhello.bgloc.BackgroundGeolocationFacade.startBackgroundService
BackgroundGeolocationFacade.java:49 com.marianhello.bgloc.BackgroundGeolocationFacade.access$700
BackgroundGeolocationFacade.java:222 com.marianhello.bgloc.BackgroundGeolocationFacade$3.onPermissionGranted
PermissionHandler.java:41 com.intentfilter.androidpermissions.PermissionHandler.checkPermissions
PermissionManager.java:50 com.intentfilter.androidpermissions.PermissionManager.checkPermissions
BackgroundGeolocationFacade.java:215 com.marianhello.bgloc.BackgroundGeolocationFacade.start
BackgroundGeolocationModule.java:145 com.marianhello.bgloc.react.BackgroundGeolocationModule.start
Method.java:-2 java.lang.reflect.Method.invoke
JavaMethodWrapper.java:374 com.facebook.react.bridge.JavaMethodWrapper.invoke
JavaModuleWrapper.java:162 com.facebook.react.bridge.JavaModuleWrapper.invoke
NativeRunnable.java:-2 com.facebook.react.bridge.queue.NativeRunnable.run
Handler.java:761 android.os.Handler.handleCallback
Handler.java:98 android.os.Handler.dispatchMessage
MessageQueueThreadHandler.java:31 com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage
Looper.java:156 android.os.Looper.loop
MessageQueueThreadImpl.java:194 com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run
Thread.java:776 java.lang.Thread.run

[Yusiro85]

Is this due to race condition? Hit this while launching the app.

[Yusiro85]

randomly getting this bug as well. This is on Plugin version: 0.5.0-alpha.21 though

java.lang.NullPointerException Attempt to invoke virtual method 'java.lang.String android.location.Location.getProvider()' on a null object reference
BackgroundLocation.java:46 com.marianhello.bgloc.data.BackgroundLocation.
AbstractLocationProvider.java:113 com.marianhello.bgloc.provider.AbstractLocationProvider.handleStationary
DistanceFilterLocationProvider.java:301 com.tenforwardconsulting.bgloc.DistanceFilterLocationProvider.onLocationChanged
LocationManager.java:374 android.location.LocationManager$ListenerTransport._handleMessage
LocationManager.java:-1 android.location.LocationManager$ListenerTransport.-wrap0
LocationManager.java:242 android.location.LocationManager$ListenerTransport$1.handleMessage
Handler.java:110 android.os.Handler.dispatchMessage
Looper.java:232 android.os.Looper.loop
ActivityThread.java:6802 android.app.ActivityThread.main
Method.java:-2 java.lang.reflect.Method.invoke
ZygoteInit.java:1103 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run
ZygoteInit.java:964 com.android.internal.os.ZygoteInit.main

@mauron85

[mauron85]

@Yusiro85 are you launching your app from notification?

[Yusiro85]

nope. I didn't.

[mauron85]

Have you modified plugin somehow? Or using vanilla? Because lines from your stack trace doesn't match. Eg.

BackgroundGeolocationModule.java:145 

Line 145 of plugin in version 0.5.0-alpha.34 is method declaration so it could not crash there.

react-native-background-geolocation/android/lib/src/main/java/com/marianhello/bgloc/react/BackgroundGeolocationModule.java

Line 145 in 4f2be66

public void switchMode(Integer mode, Callback success, Callback error) {

[Yusiro85]

Yes, I did apply a wakelock.acquire in Constructor and release it in onHostDestroy.
Is this the cause?

[mauron85]

Probably not, but it made error stacktrace useless.

[Yusiro85]

java.lang.NullPointerException Attempt to invoke virtual method 'void com.marianhello.bgloc.LocationService.start()' on a null object reference
BackgroundGeolocationFacade.java:451 com.marianhello.bgloc.BackgroundGeolocationFacade.startBackgroundService
BackgroundGeolocationFacade.java:49 com.marianhello.bgloc.BackgroundGeolocationFacade.access$700
BackgroundGeolocationFacade.java:222 com.marianhello.bgloc.BackgroundGeolocationFacade$3.onPermissionGranted
PermissionHandler.java:41 com.intentfilter.androidpermissions.PermissionHandler.checkPermissions
PermissionManager.java:50 com.intentfilter.androidpermissions.PermissionManager.checkPermissions
BackgroundGeolocationFacade.java:215 com.marianhello.bgloc.BackgroundGeolocationFacade.start
BackgroundGeolocationModule.java:145 com.marianhello.bgloc.react.BackgroundGeolocationModule.start
Method.java:-2 java.lang.reflect.Method.invoke
JavaMethodWrapper.java:374 com.facebook.react.bridge.JavaMethodWrapper.invoke
JavaModuleWrapper.java:162 com.facebook.react.bridge.JavaModuleWrapper.invoke
NativeRunnable.java:-2 com.facebook.react.bridge.queue.NativeRunnable.run
Handler.java:761 android.os.Handler.handleCallback
Handler.java:98 android.os.Handler.dispatchMessage
MessageQueueThreadHandler.java:31 com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage
Looper.java:156 android.os.Looper.loop
MessageQueueThreadImpl.java:194 com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run
Thread.java:776 java.lang.Thread.run

what about this error? this is based on Plugin version: 0.5.0-alpha.21.
I didn't modify anything but still hit this error.

[mauron85]

Not sure what is your reason to stay on old alpha (since you're not opening app from notification and that for not affected by #201)

But if you need to stay on old alpha pick up 3.0.0-alpha.22, because of this (from CHANGELOG.md) fix:

[Yusiro85]

Ok thanks for pointing me in the right direction.
I'll update to alpha 22 and try again.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically closed, because it has not had recent activity. If you believe this issue shouldn't be closed, please reopen or write down a comment requesting issue reopening with explanation why you think it's important. Thank you for your contributions.