NullPointer Exception !!!
Hello,
I try to use EJB3 in portlet, but it just raised NullPointerException !
Could you please to teach me how to solve it ?
@Stateless
@Local(ProductLocal.class)
public class ProductBean implements ProductLocal {
@PersistenceContext
// (unitName="cal")
protected EntityManager em;
/**
*
*/
public ProductBean() {
super();
// TODO Auto-generated constructor stub
}
/**
* (non-Javadoc)
*
* @see mo.reales.ejb.session.ProductLocal#addProduct(java.lang.String,
* java.lang.String, java.lang.String, float, int, int,
* java.lang.String, java.lang.String)
*/
public void addProduct(String buildingName, String floor, String flat,
float area, int totalRoom, int totalSittingRoom, String direction,
String description) {
Product product = new Product();
product.setBuildingName(buildingName);
product.setFlat(floor);
product.setFlat(flat);
product.setArea(area);
product.setTotalRoom(totalRoom);
product.setTotalSittingRoom(totalSittingRoom);
product.setDirection(direction);
product.setDescription(description);
em.persist(product);
}
/**
* (non-Javadoc)
* @see mo.reales.ejb.session.ProductLocal#getProducts()
*/
public Collection<Product> getProducts() {
return em.createQuery("from Product p").getResultList();
}
}
public interface ProductIF {
/**
* Add new product
*
* @param buildingName
* @param floor
* @param flat
* @param area
* @param totalRoom
* @param totalSittingRoom
* @param direction
* @param description
*/
public void addProduct(String buildingName, String floor, String flat,
float area, int totalRoom, int totalSittingRoom, String direction,
String description);
/**
* get all the products
*
* @return
*/
public Collection<Product> getProducts();
}
public interface ProductLocal extends ProductIF {
}
public class ProductDAO implements ProductIF {
@EJB
protected ProductLocal productLocal;
/**
*
*/
public ProductDAO() {
super();
}
/*
* (non-Javadoc)
*
* @see mo.reales.ejb.session.ProductIF#addProduct(java.lang.String,
* java.lang.String, java.lang.String, float, int, int,
* java.lang.String, java.lang.String)
*/
public void addProduct(String buildingName, String floor, String flat,
float area, int totalRoom, int totalSittingRoom, String direction,
String description) {
productLocal.addProduct(buildingName, floor, flat, area, totalRoom,
totalSittingRoom, direction, description);
}
/*
* (non-Javadoc)
*
* @see mo.reales.ejb.session.ProductIF#getProducts()
*/
public Collection<Product> getProducts() {
return productLocal.getProducts();
}
}
