NullPointerException: Attempt to invoke virtual method 'org.json.JSONObject com.amazonaws.mobile.config.AWSConfiguration.optJsonObject(java.lang.String)' on a null object reference

NullPointerException: 'Attempt to invoke virtual method org.json.JSONObject com.amazonaws.mobile.config.AWSConfiguration.optJsonObject(java.lang.String) on a null object reference'

I’m trying to migrate aws-mobile-appsync-sdk-android from 2.9.+ to 3.3.0 as per recommended by AWS for this AWS AppSync APIs v1 protocol (MQTT over WebSockets) will be disabled for all AppSync APIs in favor of v2 protocol (pure WebSockets) mentioned in below to query and receive mutations in real time. https://docs.aws.amazon.com/appsync/latest/devguide/aws-appsync-real-time-data.html

To Reproduce Steps to reproduce the behavior:

For initializing

if (mClient == null) {
val regions = Regions.fromName(BuildConfig.AWS_REGION)
val cognitoUserPool = CognitoUserPool(mContext.applicationContext, mAwsConfig.appSyncConfig?.poolId, mAwsConfig.appSyncConfig?.clientId, null, Regions.fromName(BuildConfig.AWS_REGION))
val basicCognitoUserPoolsAuthProvider = BasicCognitoUserPoolsAuthProvider(cognitoUserPool)
mClient = AWSAppSyncClient.builder()
        .context(mContext.applicationContext)
        .region(Regions.fromName(mAwsConfig.appSyncConfig?.region))
        .serverUrl(mAwsConfig.appSyncConfig?.apiUrl)
        .cognitoUserPoolsAuthProvider(basicCognitoUserPoolsAuthProvider)
        .s3ObjectManager(S3ObjectManagerImplementation(AmazonS3Client(AWSMobileClient.getInstance(), Region.getRegion(regions))))
        .build()
}

Using below snippet to create a subscription

val subscription = AddedSkusBatchSubscription.builder().countkey(mPref.getCountKey()).domain(mPref.getCompanyName()).build()
mAppSync?.mClient?.let {
mSKUsWatcher = it.subscribe(subscription)
}

When pointer comes below line of code

mSKUsWatcher?.execute(callback as AppSyncSubscriptionCall.Callback<AddedSkusBatchSubscription.Data>)

It gives NullPointerException in SDK which will be found in below stack log

2022-02-17 16:24:09.574 3286-3286/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: io.omnicounts.android, PID: 3286
java.lang.NullPointerException: Attempt to invoke virtual method 'org.json.JSONObject com.amazonaws.mobile.config.AWSConfiguration.optJsonObject(java.lang.String)' on a null object reference
    at com.amazonaws.mobileconnectors.appsync.SubscriptionAuthorizer.getAuthorizationDetails(SubscriptionAuthorizer.java:76)
    at com.amazonaws.mobileconnectors.appsync.SubscriptionAuthorizer.getConnectionAuthorizationDetails(SubscriptionAuthorizer.java:65)
    at com.amazonaws.mobileconnectors.appsync.WebSocketConnectionManager.getConnectionRequestUrl(WebSocketConnectionManager.java:387)
    at com.amazonaws.mobileconnectors.appsync.WebSocketConnectionManager.createWebSocket(WebSocketConnectionManager.java:131)
    at com.amazonaws.mobileconnectors.appsync.WebSocketConnectionManager.requestSubscription(WebSocketConnectionManager.java:90)
    at com.amazonaws.mobileconnectors.appsync.AppSyncWebSocketSubscriptionCall.execute(AppSyncWebSocketSubscriptionCall.java:48)
    at io.omnicounts.android.services.remote.AWSSubscriptionHelper.startSubscription(AWSSubscriptionHelper.kt:35)
    at io.omnicounts.android.modules.welcome.interactor.SCGatheringInfoInteractor.startSubscription(SCGatheringInfoInteractor.kt:615)
    at io.omnicounts.android.modules.welcome.presenter.SCGatheringInfoPresenter.getSkus(SCGatheringInfoPresenter.kt:43)
    at io.omnicounts.android.modules.welcome.view.SCGatheringInfoActivity.getSkus(SCGatheringInfoActivity.kt:114)
    at io.omnicounts.android.modules.welcome.view.SCGatheringInfoActivity.updateProgress(SCGatheringInfoActivity.kt:160)
    at io.omnicounts.android.modules.welcome.presenter.SCGatheringInfoPresenter.onSkuSyncEnabledResponse$lambda-4(SCGatheringInfoPresenter.kt:102)
    at io.omnicounts.android.modules.welcome.presenter.SCGatheringInfoPresenter.$r8$lambda$BCZCrkBamx51omhJsl2asz4SrYM(Unknown Source:0)
    at io.omnicounts.android.modules.welcome.presenter.SCGatheringInfoPresenter$$ExternalSyntheticLambda1.run(Unknown Source:2)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:236)
    at android.app.ActivityThread.main(ActivityThread.java:8059)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:656)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:967)
2022-02-17 16:24:09.583 3286-3286/? D/OOMEventManagerFK: checkEventAndDumpForJE: 0
2022-02-17 16:24:10.212 3286-3286/? I/Process: Sending signal. PID: 3286 SIG: 9

Expected behaviour It should subscribe the subscription and execute the callback

Environment:

While migrating from 2.9.+ to 3.3.0 in AppSync SDK

Device Information

Device: All Devices and Simulator
Android Version: 7.0 or above

Thanks for your support

@div5yesh We(@abbas-eno8 and I) fixed this issue, by adding aws configuration via code, like below

val awsConfig = AWSConfiguration(getJSONObject())

val regions = Regions.fromName(BuildConfig.AWS_REGION)
val cognitoUserPool = CognitoUserPool(mContext.applicationContext, awsConfig)
val basicCognitoUserPoolsAuthProvider = BasicCognitoUserPoolsAuthProvider(cognitoUserPool)
mClient = AWSAppSyncClient.builder()
        .context(mContext.applicationContext)
        .awsConfiguration(awsConfig)
        .cognitoUserPoolsAuthProvider(basicCognitoUserPoolsAuthProvider)
        .s3ObjectManager(S3ObjectManagerImplementation(AmazonS3Client(AWSMobileClient.getInstance(), Region.getRegion(regions))))
        .build()

And here's how we get the JSONObject

private fun getJSONObject(): JSONObject {
    val jsonObject = JSONObject()

    // CognitoUserPool
    val default = JSONObject()
    default.apply {
        put("PoolId", mAwsConfig.appSyncConfig?.poolId)
        put("AppClientId", mAwsConfig.appSyncConfig?.clientId)
        put("Region", BuildConfig.AWS_REGION)
    }
    val cognitoUserPool = JSONObject()
    cognitoUserPool.put("Default", default)
    jsonObject.put("CognitoUserPool", cognitoUserPool)

    // AppSync
    val appSyncDefault = JSONObject()
    appSyncDefault.apply {
        put("ApiUrl", mAwsConfig.appSyncConfig?.apiUrl)
        put("Region", BuildConfig.AWS_REGION)
        put("AuthMode", "AMAZON_COGNITO_USER_POOLS")
    }
    val appSync = JSONObject()
    appSync.put("Default", appSyncDefault)
    jsonObject.put("AppSync", appSync)

    return jsonObject
}

So, this issue has been fixed, but after this, we've been facing another issue which has already been raised https://github.com/awslabs/aws-mobile-appsync-sdk-android/issues/350#issuecomment-1056756621

awslabs / aws-mobile-appsync-sdk-android

NullPointerException: Attempt to invoke virtual method 'org.json.JSONObject com.amazonaws.mobile.config.AWSConfiguration.optJsonObject(java.lang.String)' on a null object reference #382