Centos6 - add and remove User

Add User

sudo adduser newuser
sudo passwd newuser

Delete User

sudo userdel -r newuser

You can add the flag “-r” to the command if you would like to simultaneously remove the users’s home directory and files.

EntityManager - find list of objects

public List<Element> findAllElements(Task task) {
    logger.info("Try to find elements - task: {}", task.getId());

    return em.createNamedQuery(Element.FIND_ALL_BY_TASK, Element.class)
               .setParameter("task", task)
               .getResultList();
}