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NullPointerException in ATOFHit.convertTdcToTime — timeOffsets array is null #1183
Description
The ATOF reconstruction engine crashes with a NullPointerException when the timeOffsets array has not been initialized. The error occurs in ATOFHit.convertTdcToTime at line 204, called during hit construction (ATOFHit.<init> line 417). This suggests the calibration constants for ATOF time offsets were not loaded from CCDB, or the relevant table/variation is missing for the current run.
Stack Trace
java.lang.NullPointerException: Cannot load from double array because "timeOffsets" is null
at org.jlab.rec.atof.hit.ATOFHit.convertTdcToTime(ATOFHit.java:204)
at org.jlab.rec.atof.hit.ATOFHit.<init>(ATOFHit.java:417)
at org.jlab.rec.atof.hit.HitFinder.findHits(HitFinder.java:92)
at org.jlab.service.atof.ATOFEngine.processDataEvent(ATOFEngine.java:106)
at org.jlab.clas.reco.ReconstructionEngine.filterEvent(ReconstructionEngine.java:368)
at org.jlab.clas.reco.ReconstructionEngine.execute(ReconstructionEngine.java:407)
Environment
- CJ 13.8.2
- timestamp: 04/04/2026-07:00:00
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mathieuouillon commentedon Apr 7, 2026
The branch https://github.com/JeffersonLab/coatjava/tree/iss_1183 fixes the issue by setting the number of index variables correctly.
But other improvements are needed: #1197
I also want to split the CalibrationConstantsLoader class into two, one for AHDC and one for ATOF
whit2333 commentedon Apr 8, 2026
@mathieuouillon Where is the PR fix?
mathieuouillon commentedon Apr 8, 2026
The branch https://github.com/JeffersonLab/coatjava/tree/iss_1183 fixes the issue, but as I said previously, I still want to work on that branch to split the CalibrationConstantLoader into two. I think we have other issues with that code, only the constants associated with the run number of the first event meet by an engine will be loaded, and often the first event in a data fill is 0. We may also have other multithreading issues.