Files.getFileAttributeView() blocking?

Question

I have a peculiar problem with the java.nio file system API. My application is running on Windows 8, Java version 1.8. I attach an alternate data stream to my files for my application scenarios.

Below is the code:

log.info("Path for which file id will be retrieved: " + fullPath);
UserDefinedFileAttributeView fileAttributeView = Files.getFileAttributeView(fullPath, UserDefinedFileAttributeView.class); //line 2
List<String> userAttributes = fileAttributeView.list();
if (userAttributes.contains("objectid")) {
    byte[] b = (byte[]) Files.getAttribute(fullPath, "user:objectid"); //line 5
    String objectId = new String(b, "UTF-8");
    log.info("File id retrieved successfully: " + objectId); //line 7
    return objectId;
}
log.info("User attributes does not contain OBJECTID ,null file id will be returned."); //line 10
return null;

Above code is getting the file attribute view for the user defined attributes.

My custom attribute is called objectid. For one of my users the neither log of (line 7) is recorded nor the log of line 10. And the application just gets blocked. I think it's getting blocked somewhere between line 2 and line 3 where two file API calls are made. Because in my scenario the code execution should not get to the line 5.

Question: Is there any scenario where the Files.getFileAttributeView() or UserDefineFileAttributeView.list() calls can get blocked? Can it be specific to any file system or any other thing which I may be missing? I have proper exception handling in the code above.

Since it is a production system I am not able to debug and also the thread dump does not show anything. This is happening only for one user which is making this case interesting.