Program: 160669
Project: 160669
Buggy source:
@Override public Integer execute() throws UserException, BimDeadlockException, BimDatabaseException {
  Revision oldRevision=getDatabaseSession().get(StorePackage.eINSTANCE.getRevision(),roid,false,null);
  Project oldProject=oldRevision.getProject();
  User user=getDatabaseSession().get(StorePackage.eINSTANCE.getUser(),currentUoid,false,null);
  if (!RightsManager.hasRightsOnProjectOrSuperProjectsOrSubProjects(user,oldProject)) {
    throw new UserException("String_Node_Str");
  }
  IfcModelSet ifcModelSet=new IfcModelSet();
  for (  ConcreteRevision subRevision : oldRevision.getConcreteRevisions()) {
    IfcModel subModel=new IfcModel();
    getDatabaseSession().getMap(subModel,subRevision.getProject().getId(),subRevision.getId(),true,null);
    subModel.setDate(subRevision.getDate());
    ifcModelSet.add(subModel);
  }
  IfcModelInterface model=bimServer.getMergerFactory().createMerger().merge(oldRevision.getProject(),ifcModelSet,bimServer.getSettingsManager().getSettings().isIntelligentMerging());
  model.resetOids();
  BimDatabaseAction<ConcreteRevision> action=new CheckinPart1DatabaseAction(getDatabaseSession(),getAccessMethod(),destPoid,currentUoid,model,comment);
  try {
    ConcreteRevision revision=action.execute();
    CheckinPart2DatabaseAction createCheckinAction=new CheckinPart2DatabaseAction(bimServer,getDatabaseSession(),getAccessMethod(),model,currentUoid,revision.getOid(),false);
    SCheckinResult result=new SCheckinResult();
    result.setProjectId(revision.getProject().getOid());
    LongCheckinAction longAction=new LongCheckinAction(bimServer,user,createCheckinAction);
    bimServer.getLongActionManager().start(longAction);
    return longAction.getId();
  }
 catch (  UserException e) {
    throw e;
  }
catch (  Exception e) {
    LOGGER.error("String_Node_Str",e);
  }
  return null;
}

Fixed version (ground truth):
@Override public Integer execute() throws UserException, BimDeadlockException, BimDatabaseException {
  Revision oldRevision=getDatabaseSession().get(StorePackage.eINSTANCE.getRevision(),roid,false,null);
  Project oldProject=oldRevision.getProject();
  User user=getDatabaseSession().get(StorePackage.eINSTANCE.getUser(),currentUoid,false,null);
  if (!RightsManager.hasRightsOnProjectOrSuperProjectsOrSubProjects(user,oldProject)) {
    throw new UserException("String_Node_Str");
  }
  IfcModelSet ifcModelSet=new IfcModelSet();
  for (  ConcreteRevision subRevision : oldRevision.getConcreteRevisions()) {
    IfcModel subModel=new IfcModel();
    getDatabaseSession().getMap(subModel,subRevision.getProject().getId(),subRevision.getId(),true,null);
    subModel.setDate(subRevision.getDate());
    ifcModelSet.add(subModel);
  }
  IfcModelInterface model=bimServer.getMergerFactory().createMerger().merge(oldRevision.getProject(),ifcModelSet,bimServer.getSettingsManager().getSettings().isIntelligentMerging());
  model.resetOids();
  BimDatabaseAction<ConcreteRevision> action=new CheckinPart1DatabaseAction(getDatabaseSession(),getAccessMethod(),destPoid,currentUoid,model,comment);
  try {
    ConcreteRevision revision=action.execute();
    CheckinPart2DatabaseAction createCheckinAction=new CheckinPart2DatabaseAction(bimServer,getDatabaseSession(),getAccessMethod(),model,currentUoid,revision.getOid(),false,true);
    SCheckinResult result=new SCheckinResult();
    result.setProjectId(revision.getProject().getOid());
    LongCheckinAction longAction=new LongCheckinAction(bimServer,user,createCheckinAction);
    bimServer.getLongActionManager().start(longAction);
    return longAction.getId();
  }
 catch (  UserException e) {
    throw e;
  }
catch (  Exception e) {
    LOGGER.error("String_Node_Str",e);
  }
  return null;
}