<!-- SQL Dialect -->
    <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
    <property name="hbm2ddl.auto">create</property>

    <!-- Names the annotated entity class -->

    <!-- List of XML mapping files -->
    <mapping class="org.test.livejava.machine.UserDetails" />

<dependency>
    <groupId>javax.persistence</groupId>
    <artifactId>persistence-api</artifactId>
    <version>1.0.2</version>
</dependency>
<!-- Hibernate annotation -->
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>3.6.3.Final</version>
</dependency>

<dependency>
    <groupId>javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.12.1.GA</version>
</dependency>

19:04:12,784  INFO org.hibernate.cfg.Environment - Hibernate 3.2.0.cr5
19:04:12,786  INFO org.hibernate.cfg.Environment - hibernate.properties not found
19:04:12,787  INFO org.hibernate.cfg.Environment - Bytecode provider name : cglib
19:04:12,789  INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling
19:04:12,818  INFO org.hibernate.cfg.Configuration - configuring from resource: /hibernate.cfg.xml
19:04:12,818  INFO org.hibernate.cfg.Configuration - Configuration resource: /hibernate.cfg.xml
org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping class="org.test.livejava.machine.UserDetails"/>
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1524)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1479)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1458)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1432)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1352)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1338)
    at org.test.livejava.machine.machine.main(machine.java:29)

Exception in thread "main" java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at org.test.livejava.machine.machine.main(machine.java:29)