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diff --git a/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/UserManagerBean.java b/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/UserManagerBean.java
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--- /dev/null
+++ b/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/impl/session/UserManagerBean.java
@@ -0,0 +1,86 @@
+package examples.shop.impl.session;
+
+import java.util.Iterator;
+import java.util.List;
+
+import javax.ejb.Remote;
+import javax.ejb.Stateless;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+
+import examples.shop.impl.entity.Customer;
+import examples.shop.logic.InvalidPasswordException;
+import examples.shop.logic.UserManager;
+
+/**
+ * UserManager is Stateless session bean resposible for creating and
+ * retrieving a customer record.  It also authenticates the user.
+ */
+
+@Stateless
+@Remote(UserManager.class)
+public class UserManagerBean implements UserManager {
+
+    @PersistenceContext
+    EntityManager manager;
+
+    public UserManagerBean() {
+    }
+    
+    /**
+     * Returns an customer object for the given customer id.
+     */
+    public Customer getUser(String customerId) {
+        return manager.find(Customer.class, customerId);       
+    }
+
+    /**
+     * It uses the customer entity bean to create a record in the databse
+     * @param customerId 
+     * @param name 
+     * @param password 
+     * @param address 
+     */
+
+    public Customer createUser(String customerId, String name, String password, String address) {        
+        Customer customer = new Customer();
+        customer.init(customerId, name, password, address);
+        manager.persist(customer);
+        return customer;
+    }
+
+    /**
+     * This method authenticates the user
+     *
+     * @return true, if the password is correct
+     * @throws an InvalidPasswordException if password is incorrect.
+     */
+
+    public boolean validateUser(String customerID, String password)
+        throws InvalidPasswordException {
+        if(customerID== null || password == null)
+            throw new IllegalArgumentException("id " + customerID + " pw " + password);
+        Customer user = getUser(customerID);
+        if (user != null && password.equals(user.getPassword())) {
+            return true;
+        } else {
+            System.out.println("Failure to validate user ID " + customerID
+                    + " with password " + password + " against password "
+                    + user.getPassword());
+            
+            throw new InvalidPasswordException("Invalid Password:"
+                    + password);
+        }
+    }
+    
+    public List<Customer> findAllCustomers() {
+        return manager.createQuery("SELECT c FROM Customer c").getResultList();
+    }
+    
+    public void removeAllCustomers() {
+        List l = manager.createQuery("SELECT c FROM Customer c ").getResultList();
+        for(Iterator iter = l.iterator(); iter.hasNext();) {
+            manager.remove(iter.next());
+        }
+    }
+}