Setup S3ClientV2 S3Mock for AWS SDKV2 Junit5

[Ghjlassi]

Hello,

I'm using the resource you provided here to create an S3 client.

   `@RegisterExtension
    static final S3MockExtension S3_MOCK =
            S3MockExtension.builder().silent().withSecureConnection(false).build();

    private S3Client s3Client;

    @Before
    public void setUp() {
        s3Client = S3_MOCK.createS3ClientV2();
        s3Client.createBucket(CreateBucketRequest.builder().bucket("my-bucket").build());
    }`

However, I'm encountering the following error:

java.lang.NullPointerException: Cannot invoke "com.adobe.testing.s3mock.S3MockApplication.getHttpPort()" because "this.s3MockFileStore" is null

It seems that the mock isn’t initializing the endpoint correctly. From what I’ve read, JUnit 5 doesn’t require manually starting S3MockStarter, but I suspect this might be the issue.

Any insights on this?

Thanks!

[afranken]

Hi,
the file you linked is the Junit5 test that we use to test that the extension works on every commit.
Not sure why it wouldn't work for you - maybe your Junit5 is not configured correctly? Or the port (9090, 9191) is already in use.

Also, the S3Client is provided by the extension, you can just add it as a function parameter.

[Ghjlassi]

Thanks for your answer @afranken,
I'm using S3Mock v3.12.0 and have verified that ports 9090 and 9191 are not in use.

The main issue is that the following initialization:

static final S3MockExtension S3_MOCK =
    S3MockExtension.builder().silent().withSecureConnection(false).build();

creates an instance where s3MockFileStore is null, as shown in my debugging screenshot.

The createClientV2() method is invoked here, and internally, it calls:

s3MockFileStore.getHttpPort();
Since s3MockFileStore is null, this results in a NullPointerException.

I haven’t found a way to explicitly set s3MockFileStore. Any ideas on how to resolve this?

Thanks!

[afranken]

Have you tried just copying the test you linked in your first comment?

[afranken]

@Ghjlassi did using the test from the S3Mock repository work for you?