[NoClassDefFoundError] Crash on Start Ranging

[JonathanImperato]

Expected behavior

Library starts ranging.

Actual behavior

java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/localbroadcastmanager/content/LocalBroadcastManager;

    at org.altbeacon.beacon.BeaconLocalBroadcastProcessor.unregister(BeaconLocalBroadcastProcessor.java:82)
    at org.altbeacon.beacon.BeaconLocalBroadcastProcessor.register(BeaconLocalBroadcastProcessor.java:74)
    at org.altbeacon.beacon.service.ScanJobScheduler.ensureNotificationProcessorSetup(ScanJobScheduler.java:70)
    at org.altbeacon.beacon.service.ScanJobScheduler.schedule(ScanJobScheduler.java:130)
    at org.altbeacon.beacon.service.ScanJobScheduler.applySettingsToScheduledJob(ScanJobScheduler.java:85)
    at org.altbeacon.beacon.service.ScanJobScheduler.applySettingsToScheduledJob(ScanJobScheduler.java:92)
    at org.altbeacon.beacon.BeaconManager.applyChangesToServices(BeaconManager.java:1008)
    at org.altbeacon.beacon.BeaconManager.startRangingBeaconsInRegion(BeaconManager.java:853)

Steps to reproduce this behavior

Add to the gradle this library
implementation 'com.google.android.material:material:1.1.0-alpha9' , version alpha9 and above.

Mobile device model and OS version

OnePlus 3t Android 9, OnePlus 7 Pro Android 9

Android Beacon Library version

Tested on latest release (2.16.2) and latest pre-release (2.16.3-beta4@aar)

[khcpietro]

androidx.localbroadcastmanager.content.LocalBroadcastManager has been deprecated, and is removed from Android 10 (API 29).
You should downgradetargetSdkVersion to 28 for workaround, and also add below to your app level gradle.build

implementation 'com.android.support:localbroadcastmanager:28.0.0'

[davidgyoung]

I don't think this problem originates from this library. In library version 2.16.2, the class mentioned in the stack trace does not use the deprecated androidx.localbroadcastmanager.content.LocalBroadcastManager it uses android.support.v4.content.LocalBroadcastManager. You can clearly see that in the souce code here: https://github.com/AltBeacon/android-beacon-library/blob/master/lib/src/main/java/org/altbeacon/beacon/BeaconLocalBroadcastProcessor.java#L31

Are you perhaps using code that dynamically changes the classes used by the library to use androidx variants? If something else is altering the library's classes, then this project can't do anything about it.

[JonathanImperato]

I don't think this problem originates from this library. In library version 2.16.2, the class mentioned in the stack trace does not use the deprecated androidx.localbroadcastmanager.content.LocalBroadcastManager it uses android.support.v4.content.LocalBroadcastManager. You can clearly see that in the souce code here: https://github.com/AltBeacon/android-beacon-library/blob/master/lib/src/main/java/org/altbeacon/beacon/BeaconLocalBroadcastProcessor.java#L31

Are you perhaps using code that dynamically changes the classes used by the library to use androidx variants? If something else is altering the library's classes, then this project can't do anything about it.

Well, I did not do anything that was not expected. The suggested solution

androidx.localbroadcastmanager.content.LocalBroadcastManager has been deprecated, and is removed from Android 10 (API 29).
You should downgradetargetSdkVersion to 28 for workaround, and also add below to your app level gradle.build

implementation 'com.android.support:localbroadcastmanager:28.0.0'

Seems to work well for me.

[davidgyoung]

Glad to hear you found a solution, @JonathanImperato

[khcpietro]

I found details.
The reason of appearing androidx package is just Jetifier problem. It convert support library into androidx automatically. You can find android.enableJetifier=true in your gradle.properties.
However, although you set android.enableJetifier to false, the problem will still occur with android.support.v4 package.
The real problem is support library does not support API 29 or above anymore. This project should migrate to androidx in the end.
Maven Repository
Error message when you use support library with targetSdkVersion 29

[davidgyoung]

@khcpietro , can you please clarify this:

You can find android.enableJetifier=true in your gradle.properties.
However, although you set android.enableJetifier to false, the problem will still occur with android.support.v4

I do not understand this part.

[khcpietro]

My mistake. I mean You as @JonathanImperato.
It just explains why androidx package appear.

I don't think this problem originates from this library. In library version 2.16.2, the class mentioned in the stack trace does not use the deprecated androidx.localbroadcastmanager.content.LocalBroadcastManager it uses android.support.v4.content.LocalBroadcastManager. You can clearly see that in the souce code here: https://github.com/AltBeacon/android-beacon-library/blob/master/lib/src/main/java/org/altbeacon/beacon/BeaconLocalBroadcastProcessor.java#L31

@JonathanImperato may enabled Jetifier, so android.support library is changed into androidx.

In anyway, both android.support.v4.content.LocalBroadcastManager and androidx.localbroadcastmanager.content.LocalBroadcastManager are no longer available for API 29+.

[davidgyoung]

I see. Well, somehow the reference app builds fine on SDK 29 and runs on Android 10 without crashing. And it has android.enableJetifier=true

Why does it not have the same problem?

[khcpietro]

I admit androidx.localbroadcastmanager.content.LocalBroadcastManager is not deprecated in Android SDK 29. My apology.

It's problem of androidx. In fact, androidx 1.0.0 == android.support 28 link
Specifically, androidx.localbroadcastmanager.content.LocalBroadcastManager is deprecated from androidx 1.1.0-alpha01 link.
So, you can see crush on your reference app when you upgrade androidx.appcompat:appcompat:1.0.0 into androidx.appcompat:appcompat:1.1.0

In summary,

1. Support Library cannot be used on Android SDK 29+ (you can find another crush if you disable Jetifier although you use androidx 1.0.0 on your reference app)
2. androidx.localbroadcastmanager.content.LocalBroadcastManager can be used on Android SDK 29+ with only androidx 1.0.0

[ofir-bar5]

Worked for me @khcpietro
The issue happened when upgrading to androidx.appcompat:appcompat to 1.1.0.

I downgraded to androidx.appcompat:appcompat to 1.0.2 and everything works fine now.

Targeting the SDK version (either using API 28 or 29) didn't matter for me.

I tested both on the library version 2.16.2 and 2.16.3

[mcaquet]

I also have this crash with the new version of the lib 2.16.4
Does it mean it's not possible to target Android SDK 29 with android-beacon-library ?

[jared-hexagon]

Any update on this? Suddenly getting crashes.

• altbeacon 2.16.4
• targeting Android SDK 28
• tested on Android 7 and 8
• gradle 4.10.1

[mcaquet]

Yes, check this post: #948
The solution is here:
https://stackoverflow.com/a/60141077

[svkim]

In build.gradle, You should modify "implementation 'androidx.appcompat:appcompat:1.0.2' "

[davidgyoung]

I am locking this issue as it has become a grab-bag of comments and requests for assistance. To be clear, this issue is marked as resolved, because there are a number of known solutions. The specific solution for you may be different depending on your build setup. The root issue is that the androidx.appcompat:appcompat are in flux ad new versions come out, and using different versions in combination with other libraries can cause the symptoms described above.

To summarize, please try the following:

*. In build.gradle, if you have a line like this, make sure you use the version shown here or newer: implementation 'androidx.localbroadcastmanager:localbroadcastmanager:1.0.0'

If you try the above and it doesn't work, please open a question on StackOverflow.com. If we find we need to update these instructions I will.