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NPE in TransformingAsyncResponseHandler#onError

See original GitHub issue

Describe the bug

From time to time, we get an ERROR log from TransformingAsyncResponseHandler telling us that there was an NPE. It does not affect our app in any way, however it feels that it shouldn’t throw that.

Expected Behavior

No log record nor NPE.

Current Behavior

We get this log statement after NPE has been raised in aws sdk core

5352c77fa1b2:2020-05-04 09:36:31,681 [speculation-executor-1] ERROR s.a.a.c.i.h.BaseAsyncClientHandler - Error thrown from TransformingAsyncResponseHandler#onError, ignoring.
5352c77fa1b2:java.lang.NullPointerException: null
5352c77fa1b2:	at software.amazon.awssdk.core.internal.http.async.AsyncResponseHandler.onError(AsyncResponseHandler.java:76)
5352c77fa1b2:	at software.amazon.awssdk.core.internal.http.async.CombinedResponseAsyncHttpResponseHandler.onError(CombinedResponseAsyncHttpResponseHandler.java:70)
5352c77fa1b2:	at software.amazon.awssdk.core.internal.handler.BaseAsyncClientHandler.lambda$doExecute$3(BaseAsyncClientHandler.java:223)
5352c77fa1b2:	at software.amazon.awssdk.utils.FunctionalUtils.runAndLogError(FunctionalUtils.java:40)
5352c77fa1b2:	at software.amazon.awssdk.core.internal.handler.BaseAsyncClientHandler.doExecute(BaseAsyncClientHandler.java:220)
5352c77fa1b2:	at software.amazon.awssdk.core.internal.handler.BaseAsyncClientHandler.execute(BaseAsyncClientHandler.java:86)
5352c77fa1b2:	at software.amazon.awssdk.awscore.client.handler.AwsAsyncClientHandler.execute(AwsAsyncClientHandler.java:52)
5352c77fa1b2:	at software.amazon.awssdk.services.dynamodb.DefaultDynamoDbAsyncClient.query(DefaultDynamoDbAsyncClient.java:2707)
...
(our code)

Steps to Reproduce

I don’t know a deterministic way.

Possible Solution

I realize that the NPE comes from AsyncResponseHandler:

    @Override
    public void onError(Throwable err) {
        streamFuture.completeExceptionally(err);
    }

where streamFuture is null, as prepare() has not been called yet.

Context

The context is we’re doing an async requests to ddb, and for some requests we may cancel them via future.cancel(). Apart from that we’re not doing anything special with our query requests.

Your Environment

AWS-SDK: 2.13.8 Java: 12

Issue Analytics

State:
Created 3 years ago
Reactions:11
Comments:9 (1 by maintainers)

Top GitHub Comments

1reaction

RealTYPICALcommented, Feb 11, 2021

This reproduced the issue consistently for me:

S3AsyncClient s3AsyncClient = S3AsyncClient.create();

Thread thread = new Thread(() -> s3AsyncClient.copyObject(CopyObjectRequest.builder().build()));

thread.interrupt();
thread.start();
thread.join();

I would expect this to throw an AbortedException/CancellationException/InterruptedException however due to the bug it’s a NullPointerException.

1reaction

adamucommented, May 19, 2020

I am also seeing this error when attempting to call SqsAsyncClient.receiveMessage(). In my case, the mesage is not received. The error doesn’t occur in in v2.12.0.

ERROR [sof.ama.aws.cor.int.han.BaseAsyncClientHandler] (executor-thread-1) Error thrown from TransformingAsyncResponseHandler#onError, ignoring.: java.lang.NullPointerException
	at software.amazon.awssdk.core.internal.http.async.AsyncResponseHandler.onError(AsyncResponseHandler.java:76)
	at software.amazon.awssdk.core.internal.http.async.CombinedResponseAsyncHttpResponseHandler.onError(CombinedResponseAsyncHttpResponseHandler.java:70)
	at software.amazon.awssdk.core.internal.handler.BaseAsyncClientHandler.lambda$doExecute$3(BaseAsyncClientHandler.java:223)
	at software.amazon.awssdk.utils.FunctionalUtils.runAndLogError(FunctionalUtils.java:40)
	at software.amazon.awssdk.core.internal.handler.BaseAsyncClientHandler.doExecute(BaseAsyncClientHandler.java:220)
	at software.amazon.awssdk.core.internal.handler.BaseAsyncClientHandler.execute(BaseAsyncClientHandler.java:86)
	at software.amazon.awssdk.awscore.client.handler.AwsAsyncClientHandler.execute(AwsAsyncClientHandler.java:52)
	at software.amazon.awssdk.services.sqs.DefaultSqsAsyncClient.receiveMessage(DefaultSqsAsyncClient.java:1149)

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