Added 'heavyduty' sample to sandbox for testing

sandbox/heavyduty/src/main/java/sample/dao/impl/UserDAOImpl.java

@@ -0,0 +1,27 @@
+package sample.dao.impl;
+
+import org.springframework.stereotype.Repository;
+
+import sample.domain.User;
+
+/**
+ * UserDAOImpl
+ */
+@Repository
+public class UserDAOImpl extends GenericDAOImpl<User, Long> implements
+		sample.dao.UserDAO {
+
+	/**
+	 * Required constructor
+	 */
+	public UserDAOImpl() {
+		super(User.class);
+	}
+
+	public User findByUsername(String username) {
+		return (User) getEntityManager().createNamedQuery("User.findByUsername")
+				.setParameter("username", username).getSingleResult();
+	}
+	
+
+}