Liferay get all Roles

If you need to get all roles from your liferay portal you can achieve it in this way:

 public void listAllRoles()
     {
         try {
            List companies=CompanyLocalServiceUtil.getCompanies();
             for(Company company:companies)
             {
                 List  roles=RoleLocalServiceUtil.getRoles(company.getCompanyId());
                for(Role role:roles)
                {
                    System.out.println(role.getRoleId()+" "+role.getName());
                }
            }
        } catch (SystemException e) {
            e.printStackTrace();
        }
    }