@Entity
@Table(name = "Users_companies")
@IdClass(UsersCompaniesId.class)
public class UsersCompanies extends ObjectMapper implements DomainObject {
    @Id
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="company_id")
    Company company;

    @Id
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name="user_id")
    User user;

    @Column(name="position")
    private String position;

    @Column(name="registration")
    @Temporal(TemporalType.TIMESTAMP)
    private Date reg;

    public Company getCompany() {
        return company;
    }

    public void setCompany(Company company) {
        this.company = company;
    }

    public User getUser() {
        return user;
    }

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

    public String getPosition() {
        return position;
    }

    public void setPosition(String position) {
        this.position = position;
    }

    public Date getReg() {
        return reg;
    }

    public void setReg(Date reg) {
        this.reg = reg;
    }

    @PrePersist
    protected void onCreate() {
        reg = new Date();
    }

    @Override
    public String toString() {
        return "UsersCompanies{" +
                "company=" + company.getName() +
                ", user=" + user.getUsername() +
                ", position='" + position + '\'' +
                ", reg=" + reg +
                '}';
    }
}

public class UsersCompaniesId implements DomainObject{
    private Company company;
    private User user;

    public Company getCompany() {
        return company;
    }

    public void setCompany(Company company) {
        this.company = company;
    }

    public User getUser() {
        return user;
    }

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

    @Override
    public String toString() {
        return "UserCompaniesId{" +
                "company=" + company.getName() +
                ", user=" + user.getUsername() +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof UsersCompaniesId)) return false;

        UsersCompaniesId that = (UsersCompaniesId) o;

        if (!getCompany().equals(that.getCompany())) return false;
        return getUser().equals(that.getUser());

    }

    @Override
    public int hashCode() {
        int result = getCompany().hashCode();
        result = 31 * result + getUser().hashCode();
        return result;
    }
}

@Repository
public interface UsersCompaniesDao extends JpaRepository<UsersCompanies, UsersCompaniesId>,
                JpaSpecificationExecutor<UsersCompanies>,
                PagingAndSortingRepository<UsersCompanies, UsersCompaniesId>
{
    UsersCompanies findByUser(User user);

    UsersCompanies findByUserAndCompany(User user, Company company);
}

Caused by: java.lang.IllegalStateException: Cannot convert value of type [java.lang.Long] to required type [com.konex.servapp.entity.user.User] for property 'user': no matching editors or conversion strategy found
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:576) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
	... 155 common frames omitted

@Entity
@Table(name = "Users")
public class User implements DomainObject, UserDetails{

    @Id
    @Column(name = "user_id")
    @SequenceGenerator(name = "users_seq", sequenceName = "users_seq", allocationSize = 1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "users_seq")
    private Long id;

    @Column(name = "login", unique = true)
//    @NotBlank
    @Size(min = 4, max = 32, message = "Логін повинен бути від 4 до 32 символів")
    private String username;

    @Column(name = "password")
//    @NotBlank
    @Size(min = 4, message = "Пароль повинен бути від 4 символів")
    private String password;

    @Transient
//    @Size(min = 4, message = "Пароль повинен бути від 4 символів")
    private String confirmPassword;

    @Transient
    private String captcha;

    @Transient
    private String confirmCaptcha;

    public String getCaptcha() {
        return captcha;
    }

    public void setCaptcha(String captcha) {
        this.captcha = captcha;
    }

    public String getConfirmCaptcha() {
        return confirmCaptcha;
    }

    public void setConfirmCaptcha(String confirmCaptcha) {
        this.confirmCaptcha = confirmCaptcha;
    }

    @Column(name = "user_PIB")
    @Size(min = 4, max = 150, message = "ПІБ повинен бути більше 4 символів")
    private String userPIB;

    @Column(name = "email", unique = true)
//    @Email
    private String eMail;

    @Column(name = "mobile")
//    @NotBlank
    @Size(min = 10, max = 14, message = "Телефон повинен бути від 10 до 14 символів")
    private String mobile;

    @Column(name = "birthday")
//    @NotNull
    @Past
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern="yyyy-MM-dd")
    private Date birthday;

    @Column(name = "sex")
    private Boolean sex;

    @Column(name = "avatara")
    private String avatara;

    @Column(name = "reg_time")
    @Temporal(TemporalType.TIMESTAMP)
    private Date regTime;

    @PrePersist
    protected void onCreate() {
        regTime = new Date();
    }

//    @PreUpdate
//    protected void onUpdate() {
//        regTime = new Date();
//    }

    @Column(name = "confirmed")
    private Boolean confirmed;

    @Column(name = "updated")
    private Boolean updated;

    @Column(name = "enabled")
    private Boolean enabled;

    @Column(name = "rating")
//    @NotNull
    private Float rating;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "User_type")
    private UserType userType;

    @ManyToMany
    @JoinTable(
            name = "users_roles",
            joinColumns = @JoinColumn(
                    name = "user_id", referencedColumnName = "user_id"),
            inverseJoinColumns = @JoinColumn(
                    name = "role_id", referencedColumnName = "role_id"))
    private Set<Role> roles;

    @ManyToMany
    @JoinTable(name = "users_companies",
            joinColumns = @JoinColumn(
                    name = "user_id", referencedColumnName = "user_id"),
            inverseJoinColumns = @JoinColumn(
                    name = "company_id", referencedColumnName = "company_id"))
    private Set<Company> companies;

    public Set<Company> getCompanies() {
        return companies;
    }

    public void setCompanies(Set<Company> companies) {
        this.companies = companies;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", userPIB='" + userPIB + '\'' +
                ", eMail='" + eMail + '\'' +
                ", mobile='" + mobile + '\'' +
                ", birthday=" + birthday +
                ", sex=" + sex +
                ", avatara='" + avatara + '\'' +
                ", regTime=" + regTime +
                ", confirmed=" + confirmed +
                ", updated=" + updated +
                ", userType=" + userType +
                ", roles=" + roles +
                ", password='" + password + '\'' +
                ", confirmPassword='" + confirmPassword + '\'' +
                ", captchas='" + captcha + '\'' +
                ", confirmCaptcha='" + confirmCaptcha + '\'' +
                '}';
    }

    public String toCompactString() {

        return "User[ " +
                "id: " + id +
                ", name: " + username +
                ", PIB: " + userPIB +
                ", eMail: " + eMail +
                ", mobile: " + mobile +
                ", birthday: " + String.format("%1$te-%1$tm-%1$tY", birthday) +
                ", sex: " + sex +
                ", regTime: " + regTime +
                ", confirmed: " + confirmed +
                ", updated: " + updated +
                ", avatara: " + avatara +
                ", enabled: " + enabled +
                " ]";
    }
    public Long getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return enabled;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        Set<GrantedAuthority> grantedAuthorities = new HashSet<>();

        for (Role role : this.getRoles()) {
            grantedAuthorities.add(new SimpleGrantedAuthority(role.getName()));
        }
        return grantedAuthorities;
    }

    public String getPassword() {
        return password;
    }

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

    public String getConfirmPassword() {
        return confirmPassword;
    }

    public void setConfirmPassword(String confirmPassword) {
        this.confirmPassword = confirmPassword;
    }

    public Set<Role> getRoles() {
        return roles;
    }

    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }

    public String getUserPIB() {
        return userPIB.trim();
    }

    public void setUserPIB(String userPIB) {         this.userPIB = userPIB;    }

    public String geteMail() {
        return eMail;
    }

    public void seteMail(String eMail) {
        this.eMail = eMail;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Boolean getSex() {
        return sex;
    }

    public void setSex(Boolean sex) {
        this.sex = sex;
    }

    public String getAvatara() {
        return avatara;
    }

    public void setAvatara(String avatara) {
        this.avatara = avatara;
    }

    public Date getRegTime() {
        return regTime;
    }

    public void setRegTime(Date regTime) {
        this.regTime = regTime;
    }

    public Boolean getConfirmed() {
        return confirmed;
    }

    public void setConfirmed(Boolean confirmed) {
        this.confirmed = confirmed;
    }

    public Boolean getUpdated() {
        return updated;
    }

    public void setUpdated(Boolean updated) {
        this.updated = updated;
    }

    public Float getRating() {
        return rating;
    }

    public void setRating(Float rating) {
        this.rating = rating;
    }

    public void changeRating(Float rating) {
        this.rating += rating;
    }

    public UserType getUserType() {
        return userType;
    }
//    public String getUserType() {
//        return userType.getName();
//    }
    public void setUserType(UserType userType) {
        this.userType = userType;
    }

    public static User getCurrentUser() {
        return (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
    }

    public static Long getCurrentUserId() {
        User u = (User) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
        return u.getId();
    }

    public static boolean isAnonymous() {
        // Метод SecurityContextHolder.getContext().getAuthentication().isAuthenticated()
        // нічого не дасть, оскільки анонімний користувач теж вважається авторизованим
        return "anonymousUser".equalsIgnoreCase(SecurityContextHolder.getContext().getAuthentication().getName());
    }

    public Boolean getEnabled() {
        return enabled;
    }

    public void setEnabled(Boolean enabled) {
        this.enabled = enabled;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof User)) return false;

        User user = (User) o;

        if (getId() != null ? !getId().equals(user.getId()) : user.getId() != null) return false;
        if (getUsername() != null ? !getUsername().equals(user.getUsername()) : user.getUsername() != null)
            return false;
        if (getPassword() != null ? !getPassword().equals(user.getPassword()) : user.getPassword() != null)
            return false;
        if (getConfirmPassword() != null ? !getConfirmPassword().equals(user.getConfirmPassword()) : user.getConfirmPassword() != null)
            return false;
        if (getCaptcha() != null ? !getCaptcha().equals(user.getCaptcha()) : user.getCaptcha() != null) return false;
        if (getConfirmCaptcha() != null ? !getConfirmCaptcha().equals(user.getConfirmCaptcha()) : user.getConfirmCaptcha() != null)
            return false;
        if (getUserPIB() != null ? !getUserPIB().equals(user.getUserPIB()) : user.getUserPIB() != null) return false;
        if (geteMail() != null ? !geteMail().equals(user.geteMail()) : user.geteMail() != null) return false;
        if (getMobile() != null ? !getMobile().equals(user.getMobile()) : user.getMobile() != null) return false;
        if (getBirthday() != null ? !getBirthday().equals(user.getBirthday()) : user.getBirthday() != null)
            return false;
        if (getSex() != null ? !getSex().equals(user.getSex()) : user.getSex() != null) return false;
        if (getAvatara() != null ? !getAvatara().equals(user.getAvatara()) : user.getAvatara() != null) return false;
        if (getRegTime() != null ? !getRegTime().equals(user.getRegTime()) : user.getRegTime() != null) return false;
        if (getConfirmed() != null ? !getConfirmed().equals(user.getConfirmed()) : user.getConfirmed() != null)
            return false;
        if (getUpdated() != null ? !getUpdated().equals(user.getUpdated()) : user.getUpdated() != null) return false;
        if (getEnabled() != null ? !getEnabled().equals(user.getEnabled()) : user.getEnabled() != null) return false;
        if (getRating() != null ? !getRating().equals(user.getRating()) : user.getRating() != null) return false;
        if (getUserType() != null ? !getUserType().equals(user.getUserType()) : user.getUserType() != null)
            return false;
        if (getRoles() != null ? !getRoles().equals(user.getRoles()) : user.getRoles() != null) return false;
        return getCompanies() != null ? getCompanies().equals(user.getCompanies()) : user.getCompanies() == null;

    }

    @Override
    public int hashCode() {
        int result = getId() != null ? getId().hashCode() : 0;
        result = 31 * result + (getUsername() != null ? getUsername().hashCode() : 0);
        result = 31 * result + (getPassword() != null ? getPassword().hashCode() : 0);
        result = 31 * result + (getConfirmPassword() != null ? getConfirmPassword().hashCode() : 0);
        result = 31 * result + (getCaptcha() != null ? getCaptcha().hashCode() : 0);
        result = 31 * result + (getConfirmCaptcha() != null ? getConfirmCaptcha().hashCode() : 0);
        result = 31 * result + (getUserPIB() != null ? getUserPIB().hashCode() : 0);
        result = 31 * result + (geteMail() != null ? geteMail().hashCode() : 0);
        result = 31 * result + (getMobile() != null ? getMobile().hashCode() : 0);
        result = 31 * result + (getBirthday() != null ? getBirthday().hashCode() : 0);
        result = 31 * result + (getSex() != null ? getSex().hashCode() : 0);
        result = 31 * result + (getAvatara() != null ? getAvatara().hashCode() : 0);
        result = 31 * result + (getRegTime() != null ? getRegTime().hashCode() : 0);
        result = 31 * result + (getConfirmed() != null ? getConfirmed().hashCode() : 0);
        result = 31 * result + (getUpdated() != null ? getUpdated().hashCode() : 0);
        result = 31 * result + (getEnabled() != null ? getEnabled().hashCode() : 0);
        result = 31 * result + (getRating() != null ? getRating().hashCode() : 0);
        result = 31 * result + (getUserType() != null ? getUserType().hashCode() : 0);
        result = 31 * result + (getRoles() != null ? getRoles().hashCode() : 0);
        result = 31 * result + (getCompanies() != null ? getCompanies().hashCode() : 0);
        return result;
    }
}

    @Override
    @Transactional
    public void save(UsersCompanies usersCompanies) {
        if(usersCompanies!=null) {
            System.out.println(usersCompanies);
            usersCompaniesDao.save(usersCompanies);
        }
    }