pullDataFromHeaders failure

Ben Wagner

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Jul 14, 2026, 2:35:25 PM (2 days ago) Jul 14

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Hi XNAT devs,

I'm getting an error when trying to pull dicom headers into xnat. See the log snips below. It's implying multiple sessions, but only one session was archived from prearchive. All StudyInstanceUID's in the archive are the same. Any suggestions?

Thanks,

Ben

curl -n -X PUT "https://ansirbids.biohpc.swmed.edu:8443/xnat/data/archive/projects/XXXX/subjects/XXXX_260001/experiments/XXX_260001_Y0?pullDataFromHeaders=true"
<html>
<head>
<title>Status page</title>
</head>
<body>
<h3>Unable to locate DICOM or ECAT files</h3><p>You can get technical details <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.5.1">here</a>.<br>
Please continue your visit at our <a href="/">home page</a>.
</p>
</body>
</html>

XDAT is spitting out this interesting tidbit.

2026-07-14 12:59:40,821 [ajp-nio-127.0.0.1-8009-exec-1] ERROR org.nrg.xnat.archive.XNATSessionBuilder - An unexpected error occurred trying to process session directory /XNAT/BIDS/XNAT_DATA/archive/ADRC/arc001/XXXX_260001_Y0
org.nrg.session.SessionBuilder$NoUniqueSessionException: Multiple sessions found: [null, 1.3.12.2.1107.5.2.43.166133.3000002607061528XXXXXXXXX]
at org.nrg.dcm.xnat.DICOMSessionBuilder.getStudyInstanceUID(DICOMSessionBuilder.java:406)
at org.nrg.dcm.xnat.DICOMSessionBuilder.<init>(DICOMSessionBuilder.java:342)
at org.nrg.dcm.xnat.DICOMSessionBuilder.<init>(DICOMSessionBuilder.java:364)
at org.nrg.dcm.xnat.DICOMSessionBuilder.<init>(DICOMSessionBuilder.java:381)
at org.nrg.xnat.archive.XNATSessionBuilder.buildDicomSession(XNATSessionBuilder.java:248)
at org.nrg.xnat.archive.XNATSessionBuilder.call(XNATSessionBuilder.java:172)
at org.nrg.xnat.restlet.actions.PullSessionDataFromHeaders.call(PullSessionDataFromHeaders.java:84)
at org.nrg.xnat.restlet.resources.SubjAssessmentResource.handlePut(SubjAssessmentResource.java:517)
at org.restlet.Finder.handle(Finder.java:359)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Router.handle(Router.java:504)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Router.handle(Router.java:504)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Filter.doHandle(Filter.java:150)
at com.noelios.restlet.StatusFilter.doHandle(StatusFilter.java:130)
[SNIP]

Along with this is restlet.log:

2026-07-14 12:59:40,915 [ajp-nio-127.0.0.1-8009-exec-1] ERROR org.nrg.xnat.restlet.resources.SubjAssessmentAbst -
java.lang.Exception: Unable to locate DICOM or ECAT files
at org.nrg.xnat.restlet.actions.PullSessionDataFromHeaders.call(PullSessionDataFromHeaders.java:88)
at org.nrg.xnat.restlet.resources.SubjAssessmentResource.handlePut(SubjAssessmentResource.java:517)
at org.restlet.Finder.handle(Finder.java:359)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Router.handle(Router.java:504)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Router.handle(Router.java:504)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)

[SNIP]

And this in applicaiton.log:

2026-07-14 13:04:19,139 [ajp-nio-127.0.0.1-8009-exec-6] ERROR org.nrg.session.SessionBuilder - /XNAT/BIDS/XNAT_DATA/archive/XXXX/arc001/XXXX_260001_Y0 must contain exactly one session
org.nrg.session.SessionBuilder$NoUniqueSessionException: No session found
at org.nrg.session.SessionBuilder.writeSession(SessionBuilder.java:210)
at org.nrg.session.SessionBuilder.run(SessionBuilder.java:249)
at org.nrg.xnat.archive.XNATSessionBuilder.buildPetSession(XNATSessionBuilder.java:233)
at org.nrg.xnat.archive.XNATSessionBuilder.call(XNATSessionBuilder.java:176)
at org.nrg.xnat.restlet.actions.PullSessionDataFromHeaders.call(PullSessionDataFromHeaders.java:84)
at org.nrg.xnat.restlet.resources.SubjAssessmentResource.handlePut(SubjAssessmentResource.java:517)
at org.restlet.Finder.handle(Finder.java:359)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Router.handle(Router.java:504)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)
at org.restlet.Filter.doHandle(Filter.java:150)
at org.restlet.Filter.handle(Filter.java:195)

Moore, Charlie

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Jul 14, 2026, 3:51:12 PM (2 days ago) Jul 14

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Hi Ben,

The way I read that error message is that some of the Study Instance UIDs are null. Any chance one or more files doesn't have a Study Instance UID specified?

Thanks,

Charlie Moore

From: xnat_di...@googlegroups.com <xnat_di...@googlegroups.com> on behalf of Ben Wagner <thewa...@gmail.com>
Sent: Tuesday, July 14, 2026 1:35 PM
To: xnat_discussion <xnat_di...@googlegroups.com>
Subject: [XNAT Discussion] pullDataFromHeaders failure

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Ben Wagner

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Jul 15, 2026, 9:06:41 AM (yesterday) Jul 15

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Hi Charlie,

Good question and I did just before posting. There were no different/null StudyInstanceUID.

Ben

[root@ansirbids SCANS]# find . -name "*.dcm" |xargs -I Y dcmdump Y | grep StudyInstanceUID | sort | uniq -c
4530 (0020,000d) UI [1.3.12.2.1107.5.2.43.166133.30000026070XXXXXXX] # 58, 1 StudyInstanceUID
[root@ansirbids SCANS]# find . -name "*.dcm" | xargs grep -L 1.3.12.2.1107.5.2.43.166133.30000026070XXXXXXXXXXX
[root@ansirbids SCANS]# find . -name "*.dcm" | wc -l
4530

Moore, Charlie

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Jul 15, 2026, 10:20:26 AM (yesterday) Jul 15

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Hi Ben,

That looks good, but just to double check:

Do all of your DICOM files have a .dcm extension or might some files have slipped through?
It looks like you're already in the SCANS dir. From a very cursory look into the code here, it might actually be using the entire session directory to try to find DICOM. Is there anything, maybe an anonymized output, you wouldn't have expected to be picked up?

Thanks,

Charlie Moore

From: xnat_di...@googlegroups.com <xnat_di...@googlegroups.com> on behalf of Ben Wagner <thewa...@gmail.com>

Sent: Wednesday, July 15, 2026 8:06 AM
To: xnat_discussion <xnat_di...@googlegroups.com>
Subject: Re: [XNAT Discussion] pullDataFromHeaders failure

To view this discussion visit https://groups.google.com/d/msgid/xnat_discussion/022f37ad-de56-41d0-b8c8-3d98a850cfbcn%40googlegroups.com.

Ben Wagner

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Jul 15, 2026, 10:43:11 AM (yesterday) Jul 15

to xnat_discussion

Hi Charlie,

I'm in the archive SCANS directory. Only dcm, gif, and xml files in the subtrees. No anonymization is applied.

Ben

Moore, Charlie

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Jul 15, 2026, 11:53:24 AM (yesterday) Jul 15

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Hi Ben,

Sorry, let me clarify. "I'm in the archive SCANS directory" isn't exactly what you want to check. This method looks like it is starting a level above that based on https://github.com/NrgXnat/xnat/blob/b35f585f50005b54cbbf1b24c40c65f096088495/xnat-web/src/main/java/org/nrg/xnat/restlet/actions/PullSessionDataFromHeaders.java#L71 . That means anything it finds in the whole session tree, whether it be session resources, assessor resources, reconstruction resources that it can parse as DICOM is going to get included here. I'm not saying this behavior is necessarily good/correct but just trying to get to the bottom of what's going on. If there's nothing like that going on then I'm afraid we're back to square one.

Thanks,

Charlie Moore

From: xnat_di...@googlegroups.com <xnat_di...@googlegroups.com> on behalf of Ben Wagner <thewa...@gmail.com>

Sent: Wednesday, July 15, 2026 9:43 AM

To view this discussion visit https://groups.google.com/d/msgid/xnat_discussion/7a60cbeb-6f83-49f1-b1b2-4fdb8fe22009n%40googlegroups.com.

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