add hibernate.cfg and HibernateUtil class

cqrs/src/main/java/com/iluwatar/cqrs/util/HibernateUtil.java

@@ -0,0 +1,36 @@
+package com.iluwatar.cqrs.util;
+
+import org.hibernate.SessionFactory;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+
+/**
+ * 
+ * @author Sabiq Ihab
+ *
+ */
+public class HibernateUtil {
+
+  private static final SessionFactory SESSIONFACTORY = buildSessionFactory();
+
+  private static SessionFactory buildSessionFactory() {
+    // A SessionFactory is set up once for an application!
+    final StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure() // configures settings //
+                                                                                              // from hibernate.cfg.xml
+        .build();
+    try {
+      return new MetadataSources(registry).buildMetadata().buildSessionFactory();
+    } catch (Throwable ex) {
+      StandardServiceRegistryBuilder.destroy(registry);
+      // TODO HibernateUtil : change print with logger
+      System.err.println("Initial SessionFactory creation failed." + ex);
+      throw new ExceptionInInitializerError(ex);
+    }
+  }
+
+  public static SessionFactory getSessionFactory() {
+    return SESSIONFACTORY;
+  }
+
+}

cqrs/src/main/resources/hibernate.cfg.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE hibernate-configuration SYSTEM
+"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
+
+<hibernate-configuration>
+	<session-factory>
+		<property name="dialect">org.hibernate.dialect.H2Dialect</property>
+		<property name="connection.driver_class">org.h2.Driver</property>
+		<property name="connection.url">jdbc:h2:mem:test</property>
+		<property name="connection.username">sa</property>
+		<property name="hbm2ddl.auto">create</property>
+		<mapping class="com.iluwatar.cqrs.domain.model.Author" />
+		<mapping class="com.iluwatar.cqrs.domain.model.Book" />
+	</session-factory>
+</hibernate-configuration>