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https://issues.apache.org/jira/browse/JCLOUDS-1504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16872085#comment-16872085
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Енчо Белезирев commented on JCLOUDS-1504:
-----------------------------------------
Hi,
I am attaching the wire logs. There is something interesting in it. For
instance, there are more than one query for certain blob:
{code:java}
Request: Sending request 782100679: HEAD
https://hcp-a0b4ab71-c807-48c5-85b7-797d57d9613e.s3-eu-central-1.amazonaws.com/12bbc932-79c5-4bed-bc9e-a82c6bc4adce
HTTP/1.1
Response: Receiving response 782100679: HTTP/1.1 404 Not Found
-----
Request: Sending request 1063600376: HEAD
https://hcp-a0b4ab71-c807-48c5-85b7-797d57d9613e.s3-eu-central-1.amazonaws.com/12bbc932-79c5-4bed-bc9e-a82c6bc4adce
Response: Receiving response 1063600376: HTTP/1.1 404 Not Found{code}
I have used the following code in order to obtain the blob's metadata:
{code:java}
Iterable<Module> modules = ImmutableSet.<Module> of(new SLF4JLoggingModule());
// Init
BlobStoreContext context = ContextBuilder.newBuilder("aws-s3")
.credentials("xxx", "xxxx")
.modules(modules)
.buildView(BlobStoreContext.class);
BlobStore blobStore = context.getBlobStore();
final String containerName = "xxxxxxxx";
PageSet<? extends StorageMetadata> list = blobStore.list(containerName,
ListContainerOptions.Builder.withDetails());
for (StorageMetadata resourceMd : list) {
System.out.println(resourceMd.getName());
System.out.println(resourceMd.getUserMetadata());
}
context.close();
{code}
I need the
{code:java}
ListContainerOptions.Builder.withDetails(){code}
because I need the userMetadata which contains some custom info about my blobs.
The NullPointerException is happening on this line:
{code:java}
System.out.println(resourceMd.getName());{code}
A little bit of explanation how the blobstore is being read and written:
# we are uploading files in it
# each file is being deleted after it is processed
> BlobStore.list(container, ListContainerOptions) returns collection containing
> null elements
> --------------------------------------------------------------------------------------------
>
> Key: JCLOUDS-1504
> URL: https://issues.apache.org/jira/browse/JCLOUDS-1504
> Project: jclouds
> Issue Type: Bug
> Reporter: Енчо Белезирев
> Priority: Blocker
>
> Hello,
> I am an SAP developer and we are using jclouds for the communication with our
> blob stores.
> We have issue with the querying of the StorageMetadata for some blobs. We are
> using the method from the BlobStore -
> {code:java}
> PageSet<? extends StorageMetadata> list(String container,
> ListContainerOptions options);{code}
> However, when we are using the method, we are providing
> ListContainerOptions.Builder.withDetails() because we want to take directly
> the userMetadata field from the StorageMetadata object and to use it later
> on. Here comes the problem, sometimes, when the method is being executed, the
> list that is being returned contains null objects. This is a problem because
> we want each StorageMetadata to be non-null.
> I have validated our entries in the container and it seemed that there are no
> suspicious entries in it(which might cause the issue).
> Could you share some information what could have caused the issue and
> eventually, is there a way to workaround this?
>
> We are using aws-s3 implementation of the blob store.
>
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