public class HibernateUtil {
    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
        } catch (Exception ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}

<session-factory>

    <property name="connection.driver_class">org.postgresql.Driver</property>
    <property name="connection.url">jdbc:postgresql://localhost:5432/dbName</property>
    <property name="connection.username">dbUsername</property>
    <property name="connection.password">dbPassword</property>

    <property name="connection.pool_size">1</property>
    <property name="dialect">org.hibernatespatial.postgis.PostgisDialect</property>
    <property name="current_session_context_class">thread</property>
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

    <property name="show_sql">true</property>

    <mapping class="com.testapp.model.EntityClassWithAnnotations" />

</session-factory>

@Entity
@Table(name = "table_name")
public class MyEntityClass implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue
    @Column(name = "gid")
    private Long gid;

    @Column(name = "adm1_name")
    private String  adminName;

    @Column(name = "adm1_code")
    private String adminCode;

    @Column(name = "pmal")
    private Double pmale;

    @Column(name = "pfem")
    private Double pfemale;

    @Type(type = "org.hibernatespatial.GeometryUserType")
    @Column(name = "the_geom", nullable = true)
    private Geometry geom;

    public MyEntityClass() {}

    public Long getGid() {
        return gid;
    }

    public void setGid(Long gid) {
        this.gid = gid;
    }

    public String getAdminName() {
        return adminName;
    }

    public void setAdmin_name(String adminName) {
        this.adminName = adminName;
    }

    public String getAdminCode() {
        return adminCode;
    }

    public void setAdmin_code(String adminCode) {
        this.adminCode = adminCode;
    }

    public Double getPmale() {
        return pmale;
    }

    public void setPmale(Double pmale) {
        this.pmale = pmale;
    }

    public Double getPfemale() {
        return pfemale;
    }

    public void setPfemale(Double pfemale) {
        this.pfemale = pfemale;
    }

    public Geometry getGeom() {
        return geom;
    }

    public void setGeom(Geometry geom) {
        this.geom = geom;
    }
}

<property name="hibernate.dialect" value="org.hibernate.spatial.dialect.postgis.PostgisDialect"/>