Hello,
есть example from http://java.sun.com/javaee/5/docs/api/index.html?javax/persistence

Example 1: One-to-Many association using generics

In Customer class:

@OneToMany(cascade=ALL, mappedBy="customer")
public Set getOrders() { return orders; }

In Order class:

@ManyToOne
@JoinColumn(name="CUST_ID", nullable=false)
public Customer getCustomer() { return customer; }

Example 2: One-to-Many association without using generics

In Customer class:

@OneToMany(targetEntity=com.acme.Order.class, cascade=ALL,
mappedBy="customer")
public Set getOrders() { return orders; }

In Order class:

@ManyToOne
@JoinColumn(name="CUST_ID", nullable=false)
public Customer getCustomer() { return customer; }

что значит "using generics", и "without using generics" ? что под generics имеется в виду???