I've put together a simple persistence example, but unfortunately it doesn't
work and I can't figure out why (I originally thought I was misusing
Stripersist, but after some clarification realized that was not the case).
Following are the pertinent pieces of code, if anyone sees what is wrong please
let me know. Note: the error stack shows NullPointerException -
practice.example.dao.BookDao.listBooks (BookDao.java:16)
.
/* BookDao.java */
public class BookDao {
@SuppressWarnings("unchecked")
public List<Book> listBooks(){
return Stripersist.getEntityManager().createQuery("from
Book").getResultList();
}
}
/* Book.java */
@Entity
@Table(name="books")
public class Book {
@Id
@GeneratedValue
@Column(name="id")
private int id;
@Column(name="title")
private String title;
@Column(name="author_name")
private String authorName;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
/* The remaining getters/setters and an empty constructor */
-Dan
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