diff --git a/ws/eclipse/HibIntro/src/main/java/session3/CompareNewlyCreated.java b/ws/eclipse/HibIntro/src/main/java/session3/CompareNewlyCreated.java
new file mode 100644
index 0000000000000000000000000000000000000000..284670467af5b8277badeee41aa5b1548c1a4121
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/session3/CompareNewlyCreated.java
@@ -0,0 +1,37 @@
+package session3;
+
+import hibintro.util.HibernateUtil;
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+/**
+ * @author goik
+ *
+ * Comparing newly created {@link User} instances both with persistent
+ * and transient partners.
+ *
+ */
+public class CompareNewlyCreated {
+
+ public static void main(String[] args) {
+
+ // Create two transient instances
+ final User a = new User(123, "goik", "Martin Goik"),
+ b = new User(123, "goik", "Martin Goik");
+
+ System.out.println("a.equals(b):" + a.equals(b));
+
+ {
+ final Session session = HibernateUtil.createSessionFactory("session3/hibernate.cfg.xml").openSession();
+ final Transaction transaction = session.beginTransaction();
+
+ // previously saved as new User(123, "goik", "Martin Goik");
+ final User user = (User) session.load(User.class, 1L);
+
+ System.out.println("a.equals(user)):" + a.equals(user));
+
+ transaction.commit();
+ session.close();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/session3/LoadUser.java b/ws/eclipse/HibIntro/src/main/java/session3/LoadUser.java
new file mode 100644
index 0000000000000000000000000000000000000000..b2b22c8bf0b246371d17851e043455256b963512
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/session3/LoadUser.java
@@ -0,0 +1,48 @@
+package session3;
+
+
+
+import hibintro.util.HibernateUtil;
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+/**
+ * @author goik
+ *
+ * Repeated retrieval of a single {@link User} object from a database.
+ *
+ */
+public class LoadUser {
+
+ /**
+ * Retrieving a single {@link User} instance by means
+ * of its primary key value two times in succession.
+ * @param args unused
+ */
+ public static void main(String[] args) {
+
+ final User user;
+ {
+ final Session session = HibernateUtil.createSessionFactory("session3/hibernate.cfg.xml").openSession();
+ final Transaction transaction = session.beginTransaction();
+ user = (User) session.load(User.class, 1L);
+ final User user1 = (User) session.load(User.class, 1L);
+
+ System.out.println(" first transaction: user.equals(user1):" + user.equals(user1));
+
+ transaction.commit();
+ session.close();
+ }
+ {
+ final Session session = HibernateUtil.createSessionFactory("session3/hibernate.cfg.xml").openSession();
+ final Transaction transaction = session.beginTransaction();
+ final User user2 = (User) session.load(User.class, 1L);
+
+ boolean val = user.equals(user2);
+ System.out.println("second transaction: user.equals(user2):" + val);
+
+ transaction.commit();
+ session.close();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/session3/PersistSingleUser.java b/ws/eclipse/HibIntro/src/main/java/session3/PersistSingleUser.java
new file mode 100644
index 0000000000000000000000000000000000000000..92e48c694b7fbce348852ff062559c71ade56f1c
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/session3/PersistSingleUser.java
@@ -0,0 +1,29 @@
+package session3;
+
+import hibintro.util.HibernateUtil;
+
+import org.hibernate.Session;
+import org.hibernate.Transaction;
+
+/**
+ * @author goik
+ *
+ * Persisting a simple instance of {@link User}
+ *
+ */
+public class PersistSingleUser {
+
+ /**
+ * @param args not used.
+ */
+ public static void main(String[] args) {
+ final Session session = HibernateUtil.createSessionFactory("session3/hibernate.cfg.xml").openSession();
+
+ final Transaction transaction = session.beginTransaction();
+ {
+ final User u = new User(123, "goik", "Martin Goik");
+ session.save(u);
+ }
+ transaction.commit();
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/session3/User.java b/ws/eclipse/HibIntro/src/main/java/session3/User.java
new file mode 100644
index 0000000000000000000000000000000000000000..0d4e88a9066647038da16a6853ce5357940d0e71
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/session3/User.java
@@ -0,0 +1,82 @@
+package session3;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+/**
+ * @author goik
+ *
+ * {@link User} instances with primary key and unique constraint
+ *
+ */
+@Entity
+@Table(uniqueConstraints={@UniqueConstraint(columnNames={"uid"}),
+ @UniqueConstraint(columnNames={"uidNumber"})})
+public class User {
+
+ @Id
+ @GeneratedValue
+ private Long id;
+ public Long getId() {return id;}
+ protected void setId(Long id) {this.id = id;}
+
+ int uidNumber;
+ public int getUidNumber() {return uidNumber;}
+ public void setUidNumber(int uidNumber) {this.uidNumber = uidNumber;}
+
+ String uid;
+
+ /**
+ *
+ * @return The user's unique login name e.g. "goik"
+ */
+ @Column(nullable=false)
+ public String getUid() {return uid;}
+ public void setUid(String uid) {this.uid = uid;}
+
+ String cname;
+ /**
+ * @return The user's common name e.g. "Martin Goik"
+ */
+ @Column(nullable = false)
+ public String getCname() {return cname;}
+ public void setCname(String cname) {this.cname = cname;}
+
+ protected User() {}
+
+ /**
+ * @param uidNumber See {@link #getUidNumber()}.
+ * @param uid See {@link #getUid()}. This parameter must not be null
+ * @param cname See {@link #getCname()}.
+ */
+ public User(final int uidNumber, final String uid, final String cname) {
+ setUidNumber(uidNumber);
+ setUid(uid);
+ setCname(cname);
+ }
+ @Override
+ public boolean equals(Object other) {
+ if (this == other) {
+ return true;
+ } else if (getUid() == null) {
+ return false;
+ } else if (other instanceof User) {
+ final User that = (User) other;
+ return this.getUid().equals( that.getUid() );
+ } else {
+ return false;
+ }
+ }
+ @Override
+ public int hashCode() {
+ if (null == getUid()) {
+ return System.identityHashCode(this);
+ } else {
+ return getUid().hashCode();
+ }
+ }
+}
\ No newline at end of file
diff --git a/ws/eclipse/HibIntro/src/main/java/session3/hibernate.cfg.xml b/ws/eclipse/HibIntro/src/main/java/session3/hibernate.cfg.xml
new file mode 100644
index 0000000000000000000000000000000000000000..b69f3505ac82d8a30a33d17893ecb22e1aaf08d5
--- /dev/null
+++ b/ws/eclipse/HibIntro/src/main/java/session3/hibernate.cfg.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!DOCTYPE hibernate-configuration PUBLIC
+ "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
+ "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
+
+<hibernate-configuration>
+ <session-factory >
+ <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
+ <property name="hibernate.connection.password">XYZ</property>
+ <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hdm</property>
+ <property name="hibernate.connection.username">hdmuser</property>
+ <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
+ <property name="hibernate.show_sql">false</property>
+ <property name="hibernate.format_sql">true</property>
+ <property name="hibernate.hbm2ddl.auto">update</property>
+
+ <mapping class="session3.User"/>
+ </session-factory>
+</hibernate-configuration>