EntityManager persist

@Entity
@Table(name = "theme")
@NamedQuery(name = "theme.GetAll", query = "select p from Theme p")
public class Theme {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    @Column(name = "text", length = 100)
    private String text;
    @OneToMany(targetEntity = News.class, mappedBy = "theme")
    private List<News> newsList;
 
    public Theme() {
    }
 
    public Theme(String text, List<News> newsList) {
        this.text = text;
        this.newsList = newsList;
    }
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public String getText() {
        return text;
    }
 
    public void setText(String text) {
        this.text = text;
    }
 
    public List<News> getNewsList() {
        return newsList;
    }
 
    public void setNewsList(List<News> newsList) {
        this.newsList = newsList;
    }
 
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
 
        Theme theme = (Theme) o;
 
        if (id != theme.id) return false;
        return text.equals(theme.text);
 
    }
 
    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + text.hashCode();
        return result;
    }
 
    @Override
    public String toString() {
        return "Theme{" +
                "id=" + id +
                ", text='" + text + '\'' +
                '}';
    }
}

@Entity
@Table(name = "news")
@NamedQueries({
        @NamedQuery(name = "news.GetAllNews", query = "select p from News p"),
})
 
public class News {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    @Column(name = "shortTitle", length = 230)
    private String shortTitle;
    @Column(name = "mainTitle", length = 30)
    private String mainTitle;
    @Column(name = "newsText")
    private String newsText;
    @Column(name = "publishDate")
    private Date publishDate;
    @Column(name = "mainPhoto")
    private byte[] mainPhoto;
 
    @ManyToOne
    private Theme theme;
 
    public News() {
    }
 
    public News(String shortTitle, String mainTitle, String newsText, Date publishDate, byte[] mainPhoto) {
        this.shortTitle = shortTitle;
        this.mainTitle = mainTitle;
        this.newsText = newsText;
        this.publishDate = publishDate;
        this.mainPhoto = mainPhoto;
    }
 
    public int getId() {
        return id;
    }
 
    public void setId(int id) {
        this.id = id;
    }
 
    public String getShortTitle() {
        return shortTitle;
    }
 
    public void setShortTitle(String shortTitle) {
        this.shortTitle = shortTitle;
    }
 
    public String getMainTitle() {
        return mainTitle;
    }
 
    public void setMainTitle(String mainTitle) {
        this.mainTitle = mainTitle;
    }
 
    public String getNewsText() {
        return newsText;
    }
 
    public void setNewsText(String newsText) {
        this.newsText = newsText;
    }
 
    public Date getPublishDate() {
        return publishDate;
    }
 
    public void setPublishDate(Date publishDate) {
        this.publishDate = publishDate;
    }
 
    public byte[] getMainPhoto() {
        return mainPhoto;
    }
 
    public void setMainPhoto(byte[] mainPhoto) {
        this.mainPhoto = mainPhoto;
    }
 
    public Theme getTheme() {
        return theme;
    }
 
    public void setTheme(Theme theme) {
        this.theme = theme;
    }
 
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
 
        News news = (News) o;
 
        if (id != news.id) return false;
        if (!shortTitle.equals(news.shortTitle)) return false;
        if (!mainTitle.equals(news.mainTitle)) return false;
        if (!newsText.equals(news.newsText)) return false;
        if (!publishDate.equals(news.publishDate)) return false;
        if (!Arrays.equals(mainPhoto, news.mainPhoto)) return false;
        return theme.equals(news.theme);
 
    }
 
    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + shortTitle.hashCode();
        result = 31 * result + mainTitle.hashCode();
        result = 31 * result + newsText.hashCode();
        result = 31 * result + publishDate.hashCode();
        result = 31 * result + Arrays.hashCode(mainPhoto);
        result = 31 * result + theme.hashCode();
        return result;
    }
 
    @Override
    public String toString() {
        return "News{" +
                "shortTitle='" + shortTitle + '\'' +
                ", mainTitle='" + mainTitle + '\'' +
                ", newsText='" + newsText + '\'' +
                '}';
    }
}

    @Test
    public void testInsertTheme() throws Exception{
        em.getTransaction().begin();
        Theme theme = new Theme("test", null);
        em.persist(theme);
        em.getTransaction().commit();
        List<Theme> list = em.createNativeQuery("select * from theme", Theme.class).getResultList();
        assertEquals(7, list.size());
    }