ExceptionInInitializerError when calling AwsIotMqttConnectionBuilder.newMtlsBuilder()

[vinit-mahitech]

Describe the bug

I am migrating from aws-sdk-android to aws-iot-device-sdk-java-v2.
While creating an MqttClientConnection instance, I encounter the following runtime error:

java.lang.ExceptionInInitializerError
    at software.amazon.awssdk.crt.CrtResource.<clinit>(CrtResource.java:104)
    at software.amazon.awssdk.iot.AwsIotMqttConnectionBuilder.newMtlsBuilder(AwsIotMqttConnectionBuilder.java:121)
    ...
Caused by: software.amazon.awssdk.crt.CrtRuntimeException: Unable to unpack AWS CRT library
    at software.amazon.awssdk.crt.CRT.loadLibraryFromJar(CRT.java:346)
    at software.amazon.awssdk.crt.CRT.<clinit>(CRT.java:50)
    at software.amazon.awssdk.crt.CrtResource.<clinit>(CrtResource.java:104)
    at software.amazon.awssdk.iot.AwsIotMqttConnectionBuilder.newMtlsBuilder(AwsIotMqttConnectionBuilder.java:121)
    ...

Expected Behavior

MqttClientConnection should be created successfully without throwing an error.

Current Behavior

Calling newMtlsBuilder() results in ExceptionInInitializerError due to a CrtRuntimeException.

Reproduction Steps

val clientConnection = AwsIotMqttConnectionBuilder
    .newMtlsBuilder(thingCert, thingCertKey)
    .withEndpoint(endpoint)
    .withClientId(clientId)
    .withCleanSession(false)
    .withReconnectTimeoutSecs(1, 32)

Possible Solution

No response

Additional Information/Context

No response

SDK version used

1.27.0

Environment details (OS name and version, etc.)

Android 12

[sbSteveK]

Please refer to this guide for using the aws-iot-device-sdk-java-v2 on Android: https://github.com/aws/aws-iot-device-sdk-java-v2/blob/main/documents/ANDROID.md

Please be sure that the correct dependencies are set.
Instructions on setting the dependency can be found here: https://github.com/aws/aws-iot-device-sdk-java-v2/blob/main/documents/ANDROID.md#consuming-iot-device-sdk-android
You can also check the build.gradle of our Android sample here:

aws-iot-device-sdk-java-v2/samples/Android/app/build.gradle

Line 79 in 7e64e9b

dependencies {

If those aren't sufficient, please provide Trace level logs. Logging instructions can be found here: https://github.com/aws/aws-iot-device-sdk-java-v2/blob/main/documents/FAQ.md#how-do-i-enable-logging

The reproduction steps provided aren't sufficient to track down the issue you are describing as in our testing, we are able to find and access the AWS CRT library.

We also strongly recommend you use the MQTT5 client instead of the MQTT311 client if possible. An MQTT5 Client usage guide can be found here: https://github.com/aws/aws-iot-device-sdk-java-v2/blob/main/documents/MQTT5_Userguide.md

[vinit-mahitech]

Thanks @sbSteveK , I was able to resolve the issue by updating the build configuration from the sample app:

1. Updated the dependency to the Android-specific artifact:
   api("software.amazon.awssdk.iotdevicesdk:aws-iot-device-sdk-android:1.27.2")

2. Added the required core library desugaring configuration.

Also as per your suggestion, I will utilise the MQTT5 client.

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