AWS Lambda - NullPointerException in TracingSqsEventHandler

[tduncan]

Describe the bug

TracingSqsEventHandler throws a NullPointerException when an AWS Lambda function extending from either TracingSqsEventHandler or TracingSqsEventWrapper is invoked with something other than an SQS event. This NullPointerException prevents the Lambda function from executing. See the stacktrace below (taken from CloudWatch logs).

{
  "errorMessage": "java.lang.NullPointerException",
  "errorType": "java.lang.NullPointerException",
  "stackTrace": [
    "io.opentelemetry.instrumentation.awslambdaevents.v2_2.internal.AwsLambdaSqsInstrumenterFactory.spanName(AwsLambdaSqsInstrumenterFactory.java:42)",
    "io.opentelemetry.instrumentation.api.instrumenter.Instrumenter.doStart(Instrumenter.java:165)",
    "io.opentelemetry.instrumentation.api.instrumenter.Instrumenter.start(Instrumenter.java:131)",
    "io.opentelemetry.instrumentation.awslambdaevents.v2_2.TracingSqsEventHandler.doHandleRequest(TracingSqsEventHandler.java:57)",
    "io.opentelemetry.instrumentation.awslambdaevents.v2_2.TracingSqsEventHandler.doHandleRequest(TracingSqsEventHandler.java:17)",
    "io.opentelemetry.instrumentation.awslambdacore.v1_0.TracingRequestHandler.handleRequest(TracingRequestHandler.java:79)"
  ]
}

Steps to reproduce

1. Create a AWS Lambda request handler extending TracingSqsEventWrapper
2. Deploy the Lambda function (include the OpenTelemetry libraries in the .zip)
3. Invoke the Lambda function in someway other than an SQS message

Expected behavior

The AWS Lambda function to still be executed. Exceptions in the instrumentation layer shouldn't prevent AWS Lambda functions from receiving events.

Actual behavior

The NullPointerException stops the AWS Lambda function from executing.

Javaagent or library instrumentation version

1.31.0-alpha

Environment

JDK: Amazon Corretto 11
OS: Amazon Linux 2

Additional context

No response