Com.sun.faces.mgbean.ManagedBeanCreationException: Cant instantiate class..

Question

I create a enterprise application using jsf 2.0, ejb3, primefaces 2 and I want to show data in table immediately after ejb call findAll() method. But it's always appear: "can't instantiate class". Here is my code:
index.xhtml
        <h:form>
            <p:dataTable id="tbl" var="p" value="#{Product.products}" >
                <p:column>
                    <f:facet name="header">
                        Product Id
                    </f:facet>
                    <h:outputText value="#{p.productID}" />
                </p:column>
                <p:column>
                    <f:facet name="header">
                        Product Name
                    </f:facet>
                    <h:outputText value="#{p.productName}" />
                </p:column>
                <p:column>
                    <f:facet name="header">
                        Unit Price
                    </f:facet>
                    <h:outputText value="#{p.unitPrice}" />
                </p:column>
            </p:dataTable>
        </h:form>
package myEntity;
@Entity
@Table(name = "Products")
@NamedQueries({
    @NamedQuery(name = "Products.*findAll*", query = "SELECT p FROM Products p"),
public class Products implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "productID")
    private Integer productID;
    @Basic(optional = false)
    @Column(name = "productName")
    private String productName;
    @Basic(optional = false)
    @Column(name = "unitPrice")
    private double unitPrice;
    public Products() {
    public Products(Integer productID) {
        this.productID = productID;
    public Products(Integer productID, String productName, double unitPrice) {
        this.productID = productID;
        this.productName = productName;
        this.unitPrice = unitPrice;
    public Integer getProductID() {
        return productID;
    public void setProductID(Integer productID) {
        this.productID = productID;
    public String getProductName() {
        return productName;
    public void setProductName(String productName) {
        this.productName = productName;
    public double getUnitPrice() {
        return unitPrice;
    public void setUnitPrice(double unitPrice) {
        this.unitPrice = unitPrice;
package mySessionBean;
@Stateless
public class ProductsFacade implements ProductsFacadeLocal {
    @PersistenceContext(unitName = "demoProduct-ejbPU")
    private EntityManager em;
    public List<Products> *findAll*() {
        CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
        cq.select(cq.from(Products.class));
        return em.createQuery(cq).getResultList();
package myManagedBean;
@ManagedBean(name="Product")
@RequestScoped
public class Product {
    @EJB
    private ProductsFacadeLocal productsFacade;
    private List<Products> products;
    /** Creates a new instance of Product */
    public Product() {
        *products = productsFacade.findAll();*
    public List<Products> getProducts() {
        return products;
    public void setProducts(List<Products> products) {
        this.products = products;
An Error Occurred:
Cant instantiate class: myManagedBean.Product.
+- Stack Trace
com.sun.faces.mgbean.ManagedBeanCreationException: Cant instantiate class: myManagedBean.Product.
     at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:193)
Caused by: java.lang.NullPointerException
     at myManagedBean.Product.<init>(Product.java:36)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
     at java.lang.Class.newInstance0(Class.java:355)
     at java.lang.Class.newInstance(Class.java:308)
     at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:188)

Answer 1

This is just baffling. The OP 'created' an enterprise application, but doesn't know the basics of the basics that is null-references? That is like knowing how to do your taxes without knowing how to add and subtract.