public class ExampleUserDetails extends SocialUser {

private Long id;

private String firstName;

private String lastName;

private Role role;

private SocialMediaService socialSignInProvider;

public ExampleUserDetails(String username, String password, Collection<? extends GrantedAuthority> authorities) {
    super(username, password, authorities);
}

//Getters are omitted for the sake of clarity.

public static class Builder {

    private Long id;

    private String username;

    private String firstName;

    private String lastName;

    private String password;

    private Role role;

    private SocialMediaService socialSignInProvider;

    private Set<GrantedAuthority> authorities;

    public Builder() {
        this.authorities = new HashSet<>();
    }

    public Builder firstName(String firstName) {
        this.firstName = firstName;
        return this;
    }

    public Builder id(Long id) {
        this.id = id;
        return this;
    }

    public Builder lastName(String lastName) {
        this.lastName = lastName;
        return this;
    }

    public Builder password(String password) {
        if (password == null) {
            password = "SocialUser";
        }

        this.password = password;
        return this;
    }

    public Builder role(Role role) {
        this.role = role;

        SimpleGrantedAuthority authority = new SimpleGrantedAuthority(role.toString());
        this.authorities.add(authority);

        return this;
    }

    public Builder socialSignInProvider(SocialMediaService socialSignInProvider) {
        this.socialSignInProvider = socialSignInProvider;
        return this;
    }

    public Builder username(String username) {
        this.username = username;
        return this;
    }

    public ExampleUserDetails build() {
        ExampleUserDetails user = new ExampleUserDetails(username, password, authorities);

        user.id = id;
        user.firstName = firstName;
        user.lastName = lastName;
        user.role = role;
        user.socialSignInProvider = socialSignInProvider;

        return user;
    }
}

ExampleUserDetails principal = ExampleUserDetails.getBuilder()
            .firstName(user.getFirstName())
            .id(user.getId())
            .lastName(user.getLastName())
            .password(user.getPassword())
            .role(user.getRole())
            .socialSignInProvider(user.getSignInProvider())
            .username(user.getEmail())
            .build();