try {

            // The "sql" data types.
            Type type = new StringType();

            //Type dynamicType = new DynamicComponentType(new String[]{"bar"}, new Type[]{type}, new int[]{-1}, new Cascades.CascadeStyle[]{Cascades.STYLE_NONE});

            //Type dynamicType = new DynamicComponentType(new String[]{"foo", "bar"}, new Type[]{type, type}, new int[]{-1}, new Cascades.CascadeStyle[]{Cascades.STYLE_NONE, Cascades.STYLE_NONE});


            Type dynamicType = new DynamicComponentType(new String[]{"foo", "bar", "tender"},
                    new Type[]{type, type, type}, new int[]{-1},
                    new Cascades.CascadeStyle[]{Cascades.STYLE_NONE, Cascades.STYLE_NONE, Cascades.STYLE_NONE});


            // The persistent dynamic attribute.
            PersistentClass persistentClass = cfg.createMappings().getClass(Dynamic.class);
            Property dynamicProperty = persistentClass.getProperty("dynamicAttributes");

            // Get the dynamic component and
            Component dynamicComponent = (Component) dynamicProperty.getValue();

            dynamicComponent.setType(dynamicType);

            // Add the new attribute if the component is a dynamic component.
            if (dynamicComponent.isDynamic()) {
                dynamicComponent.addProperty(addDynamicAttribute("foo", type, persistentClass));
                dynamicComponent.addProperty(addDynamicAttribute("bar", type, persistentClass));
                dynamicComponent.addProperty(addDynamicAttribute("tender", type, persistentClass));
            }

            // Database schema update.
            try {
                //sessionFactoryBean.updateDatabaseSchema();
                new SchemaUpdate(cfg).execute(true, true);
            }
            catch (HibernateException he) {
                he.printStackTrace();
            }
        }
        catch (MappingException me) {
            me.printStackTrace();
        }

    private Property addDynamicAttribute(String name, Type type, PersistentClass persistentClass) {

        // Create a new db column specification.
        Column column = new Column();
        column.setName(name.toUpperCase());
        column.setType(type);

        // Add column to table also.
        persistentClass.getTable().addColumn(column);

        // Create a simple value that contains the column and will be set to the property as information.
        SimpleValue simpleValue = new SimpleValue(persistentClass.getTable());
        simpleValue.addColumn(column);
        simpleValue.setType(type);

        // Create a new property.
        Property property = new Property();
        property.setName(name);
        property.setPropertyAccessorName("property");
        property.setCascade("none");
        property.setValue(simpleValue);

        return property;
    }

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<!--
    The dynmic test mapping.

    @author Romsl
-->

<hibernate-mapping>

    <class name="bo.Dynamic" table="Z_DYNAMIC_COMPONENT">

        <id name="id" type="long" unsaved-value="-1">
            <column name="ID" not-null="true"/>
            <generator class="native"/>
        </id>

        <property name="name" type="string">
            <column name="NAME" not-null="true"/>
        </property>

        <dynamic-component name="dynamicAttributes"/>

    </class>

</hibernate-mapping>