Problem with Session EJB - Hibernate
Hi, i am very new on Hibernate, and also EJB's. The problem is that i just want to save @ManyToOne related records based on different tables.
Please tell me if i am following a WRONG architecture? And also when i execute mainline,
i get an error of
java.lang.RuntimeException: javax.transaction.RollbackException: [com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted] [com.arjuna.ats.internal.jta.transaction.arjunacore.commitwhenaborted] Can't commit because the transaction is in aborted state . . . . at com.las.client.MainLine.main(MainLine.java:52) Caused by: java.lang.IllegalStateException: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.las.pojo.BookEntity.categoryEN -> com.las.pojo.CategoryEntity at
I use MSSQL, PK Fields are identity.. Here are my codes..
CATEGORY has many BOOKs
Book Entity / Pojo
@Entity
@Table(name="BOOK")
public class BookEntity implements Serializable {
@Id @GeneratedValue
@Column(name="ID")
private Long id;
@Column(name="NAME")
private String name;
@ManyToOne
@JoinColumn(name="CATEGORYID")
private CategoryEntity categoryEN;
public BookEntity() {
}
public void setId(Long id) {
this.id = id;
}
public Long getId() {
return id;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setCategoryEN(CategoryEntity categoryEN) {
this.categoryEN = categoryEN;
}
public CategoryEntity getCategoryEN() {
return categoryEN;
}
}
Category Entity / Pojo
@Entity
@Table(name="CATEGORY")
public class CategoryEntity implements Serializable {
@Id @GeneratedValue
@Column(name="ID")
private Long id;
@Column(name="NAME")
private String name;
@OneToMany(mappedBy="categoryEN")
private Set<BookEntity> bookList;
public CategoryEntity() {
}
public CategoryEntity(String name) {
this.name = name;
}
public void setId(Long id) {
this.id = id;
}
public Long getId() {
return id;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setBookList(Set<BookEntity> bookList) {
this.bookList = bookList;
}
public Set<BookEntity> getBookList() {
return bookList;
}
}BookEJB
@Stateless(name="BookEJB")
public class BookEJBBean implements BookEJB, BookEJBLocal {
@PersistenceContext(unitName="lasDatabase")
private EntityManager em;
public BookEJBBean() {
}
public void Save(BookEntity BookEN) {
em.persist(BookEN);
}
public void Delete(BookEntity BookEN) {
}
public List<BookEntity> getAll() {
return em.createQuery("from BOOK")
.getResultList();
}
public BookEntity getSimple(Long id) {
return em.find(BookEntity.class, id);
}
}CategoryEJB
@Stateless(name="CategoryEJB")
public class CategoryEJBBean implements CategoryEJB, Serializable {
@PersistenceContext(unitName="lasDatabase")
private EntityManager em;
public CategoryEJBBean() {
}
public void Save(CategoryEntity categoryEN) {
em.persist(categoryEN);
}
public void Delete(CategoryEntity categoryEN) {
}
public List<CategoryEntity> getAll() {
return em.createQuery("from CATEGORY")
.getResultList();
}
public CategoryEntity getSimple(Long id) {
return em.find(CategoryEntity.class, id);
}
}CLIENT CODE
public class MainLine {
public MainLine() {
}
public static void main(String[] args) {
MainLine mainLine = new MainLine();
try {
Context context = new InitialContext();
CategoryEJB categoryRemote = (CategoryEJB)context.lookup("lasejb/CategoryEJB/remote");
BookEJB bookRemote = (BookEJB)context.lookup("lasejb/BookEJB/remote");
CategoryEntity categoryEN = new CategoryEntity("Horror");
categoryRemote.Save(categoryEN);
BookEntity bookEN = new BookEntity();
bookEN.setIsbn("123-321-333");
bookEN.setName("ABC");
bookEN.setCategoryEN(categoryEN);
categoryRemote.Save(categoryEN);
bookRemote.Save(bookEN);
}
catch(Exception ex) {
ex.printStackTrace();
}
}
}