@Entity
@Transactional
public class FisicHost {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(fetch=FetchType.EAGER)
    private Datacenter datacenter;

    @OneToMany(mappedBy = "fisicHost")
    @LazyCollection(LazyCollectionOption.FALSE)
    private List<Credential> credentials;

    private String name;
    private String ip;
    private String operatingSystem;
    private String notes;

    public FisicHost(){

    }

    public FisicHost(Long id, Datacenter datacenter, List<Credential> credentials, String name, String ip, String operatingSystem, String notes) {
        this.id = id;
        this.datacenter = datacenter;
        this.credentials = credentials;
        this.name = name;
        this.ip = ip;
        this.operatingSystem = operatingSystem;
        this.notes = notes;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Datacenter getDatacenter() {
        return datacenter;
    }

    public void setDatacenter(Datacenter datacenter) {
        this.datacenter = datacenter;
    }

    public List<Credential> getCredentials() {
        return credentials;
    }

    public void setCredentials(List<Credential> credentials) {
        this.credentials = credentials;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getIp() {
        return ip;
    }

    public void setIp(String ip) {
        this.ip = ip;
    }

    public String getOperatingSystem() {
        return operatingSystem;
    }

    public void setOperatingSystem(String operatingSystem) {
        this.operatingSystem = operatingSystem;
    }

    public String getNotes() {
        return notes;
    }

    public void setNotes(String notes) {
        this.notes = notes;
    }
}

@Entity
public class Credential {

    @Id
    private int id;

    @ManyToOne(fetch= FetchType.EAGER)
    private FisicHost fisicHost;

    private String user;
    private String password;
    private String notes;
    private String role;

    public Credential(){

    }

    public Credential(int id, FisicHost fisicHost, String user, String password, String notes, String role) {
        this.id = id;
        this.fisicHost = fisicHost;
        this.user = user;
        this.password = password;
        this.notes = notes;
        this.role = role;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public FisicHost getFisicHost() {
        return fisicHost;
    }

    public void setFisicHost(FisicHost fisicHost) {
        this.fisicHost = fisicHost;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getNotes() {
        return notes;
    }

    public void setNotes(String notes) {
        this.notes = notes;
    }

    public String getRole() {
        return role;
    }

    public void setRole(String role) {
        this.role = role;
    }
}

@Repository
public class CredentialDaoImpl implements CredentialDao {

    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public List<Credential> getAllCredentialsByFisicHost(FisicHost fisicHost) {
        // Open a session
        Session session = sessionFactory.openSession();

        Criteria c = session.createCriteria(Credential.class).add(Restrictions.eq("fisicHost", fisicHost.getId()));

        List<Credential> allCredentials = c.list();

        // Close the session
        session.close();

        return allCredentials;
    }

@RequestMapping(value = "/chosenDatacenter", method = RequestMethod.POST)
public String datacenterPostHandler(@RequestParam("datacenterList") String name, ModelMap modelMap){
    List<Datacenter> allDatacenters = datacenterDao.getAllDatacenters();
    for (Datacenter dc : allDatacenters) {
        if (dc.getName().equals(name)) {
        modelMap.put("datacenter", dc);
        if(dc.getFisicHostList().size() != 0) {
            List<FisicHost> datacenterFisicHosts = dc.getFisicHostList();
            modelMap.put("datacenterFisicHosts", datacenterFisicHosts);
            for(FisicHost fh : datacenterFisicHosts){
                if(fh.getCredentials().size() != 0){
                    modelMap.put("fisicHostCredentialsList", credentialDao.getAllCredentialsByFisicHost(fh));
                }
            }
        }
        return "chosenDatacenter";
        }
    }
        return null;
}

Criteria c = session.createCriteria(Credential.class).add(Restrictions.eq("fisicHost", fisicHost.getId()));

Criteria c = session.createCriteria(Credential.class).add(Restrictions.eq("fisicHost.id", fisicHost.getId()));