Connection con  = connectionSet.getConnection();
ContractManager cm = new ContractManager(con);
Contract contract = cm.getContractById(cid);

Connection con = connectionSet.getConnection();
ContractDao contractDao = new ContractDao(con, User.USER_SERVER);
Contract contract = contractDao.get(CONTRACT_ID);

getContractById
public Contract getContractById(int cid)
Возвращает договор по его коду
Parameters:
cid - код договора
Returns:

ServerContext context = ServerContext.get();
ContractService contractService = context.getService(ContractService.class, 0);
contractService.contractGet(CONTRACT_ID);

 private ContractDao getDao() {
        if(this.contractDao == null) {
            this.contractDao = new ContractDao(this.getConnection(), this.userId);
        }

        return this.contractDao;
    }
...
@PreDestroy
    private void destroy() {
        try {
            if(this.contractDao != null) {
                this.contractDao.close();
                this.contractDao = null;
            }
        } catch (Exception var2) {
            logger.error(var2.getMessage(), var2);
        }

    }
...

public Contract contractGet(int contractId) throws BGException {
        return (Contract)this.getDao().get(contractId);
    }