User.java

package com.querydsl.example.jpa.model;

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

@Entity
@Table(name = "user")
public class User extends BaseEntity {
    @Column(unique = true)
    private String username;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "poster")
    private Set<Tweet> tweets = new HashSet<Tweet>();

    public User() {
    }

    public User(Long id, String username) {
        setId(id);
        this.username = username;
    }

    public User(String username) {
        this.username = username;
    }

    public String getUsername() {
        return username;
    }

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

    public void setTweets(Set<Tweet> tweets) {
        this.tweets = tweets;
    }

    public Set<Tweet> getTweets() {
        return tweets;
    }
}