From a4a0d1685ad4716ef65a472445fd755ea42e7a3d Mon Sep 17 00:00:00 2001
From: mmusich <marco.musich@cern.ch>
Date: Fri, 6 Dec 2024 22:02:11 +0100
Subject: [PATCH] annotate SequentialPrimaryVertexFitterAdapter::fit exception

---
 .../interface/SequentialPrimaryVertexFitterAdapter.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/RecoVertex/PrimaryVertexProducer/interface/SequentialPrimaryVertexFitterAdapter.h b/RecoVertex/PrimaryVertexProducer/interface/SequentialPrimaryVertexFitterAdapter.h
index 3c75fbab20037..b512aa61cf492 100644
--- a/RecoVertex/PrimaryVertexProducer/interface/SequentialPrimaryVertexFitterAdapter.h
+++ b/RecoVertex/PrimaryVertexProducer/interface/SequentialPrimaryVertexFitterAdapter.h
@@ -7,6 +7,8 @@
 
 */
 
+#include <sstream>
+
 #include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"
 #include "TrackingTools/TransientTrack/interface/TransientTrack.h"
 #include "RecoVertex/PrimaryVertexProducer/interface/PrimaryVertexFitterBase.h"
@@ -27,7 +29,15 @@ class SequentialPrimaryVertexFitterAdapter : public PrimaryVertexFitterBase {
       const std::vector<reco::TransientTrack>& tracklist = cluster.originalTracks();
       TransientVertex v;
       if (useBeamConstraint && (tracklist.size() > 1)) {
-        v = fitter->vertex(tracklist, beamspot);
+        try {
+          v = fitter->vertex(tracklist, beamspot);
+        } catch (VertexException& ex) {
+          std::ostringstream beamspotInfo;
+          beamspotInfo << "While processing SequentialPrimaryVertexFitterAdapter::fit() with BeamSpot parameters: \n"
+                       << beamspot;
+          ex.addContext(beamspotInfo.str());
+          throw;  // rethrow the exception
+        }
       } else if (!(useBeamConstraint) && (tracklist.size() > 1)) {
         v = fitter->vertex(tracklist);
       }  // else: no fit ==> v.isValid()=False