Program: 160677
Project: 160677
Buggy source:
@Override public ConcreteRevision execute() throws UserException, BimDeadlockException, BimDatabaseException {
  Project project=getProjectByPoid(poid);
  User user=getUserByUoid(actingUid);
  if (project == null) {
    throw new UserException("String_Node_Str" + poid + "String_Node_Str");
  }
  if (user.getUserType() == UserType.ANONYMOUS) {
    throw new UserException("String_Node_Str");
  }
  if (!RightsManager.hasRightsOnProjectOrSuperProjects(user,project)) {
    throw new UserException("String_Node_Str");
  }
  if (!MailSystem.isValidEmailAddress(user.getUsername())) {
    throw new UserException("String_Node_Str");
  }
  checkCheckSum(project);
  if (!project.getRevisions().isEmpty() && project.getRevisions().get(project.getRevisions().size() - 1).getState() == CheckinState.STORING) {
    throw new UserException("String_Node_Str");
  }
  ConcreteRevision concreteRevision=createNewConcreteRevision(getDatabaseSession(),getModel().getSize(),poid,actingUid,comment.trim(),CheckinState.STORING);
  concreteRevision.setChecksum(getModel().getChecksum());
  NewRevisionAdded newRevisionAdded=LogFactory.eINSTANCE.createNewRevisionAdded();
  newRevisionAdded.setDate(new Date());
  newRevisionAdded.setExecutor(user);
  newRevisionAdded.setRevision(concreteRevision.getRevisions().get(0));
  newRevisionAdded.setAccessMethod(getAccessMethod());
  getDatabaseSession().store(newRevisionAdded);
  getDatabaseSession().store(concreteRevision);
  getDatabaseSession().store(project);
  return concreteRevision;
}

Fixed version (ground truth):
@Override public ConcreteRevision execute() throws UserException, BimDeadlockException, BimDatabaseException {
  try {
    Project project=getProjectByPoid(poid);
    User user=getUserByUoid(actingUid);
    if (project == null) {
      throw new UserException("String_Node_Str" + poid + "String_Node_Str");
    }
    if (user.getUserType() == UserType.ANONYMOUS) {
      throw new UserException("String_Node_Str");
    }
    if (!RightsManager.hasRightsOnProjectOrSuperProjects(user,project)) {
      throw new UserException("String_Node_Str");
    }
    if (!MailSystem.isValidEmailAddress(user.getUsername())) {
      throw new UserException("String_Node_Str");
    }
    checkCheckSum(project);
    if (!project.getRevisions().isEmpty() && project.getRevisions().get(project.getRevisions().size() - 1).getState() == CheckinState.STORING) {
      throw new UserException("String_Node_Str");
    }
    ConcreteRevision concreteRevision=createNewConcreteRevision(getDatabaseSession(),getModel().getSize(),poid,actingUid,comment.trim(),CheckinState.STORING);
    concreteRevision.setChecksum(getModel().getChecksum());
    NewRevisionAdded newRevisionAdded=LogFactory.eINSTANCE.createNewRevisionAdded();
    newRevisionAdded.setDate(new Date());
    newRevisionAdded.setExecutor(user);
    newRevisionAdded.setRevision(concreteRevision.getRevisions().get(0));
    newRevisionAdded.setAccessMethod(getAccessMethod());
    getDatabaseSession().store(newRevisionAdded);
    getDatabaseSession().store(concreteRevision);
    getDatabaseSession().store(project);
    return concreteRevision;
  }
 catch (  Exception e) {
    throw new UserException(e);
  }
}