I am creating table like below.

CREATE TABLE `Channel_Amenities` ( 
`id` INT(10) NOT NULL AUTO_INCREMENT, `distributorId` INT(10) NOT NULL, 
`amenityID` INT(10) NOT NULL, 
`amenityName` VARCHAR(50) NOT NULL, 
`categoryID` INT(10) NOT NULL, 
`categoryName` VARBINARY(200) NOT NULL, 
PRIMARY KEY (`id`),
 UNIQUE INDEX `distributorId_amenityID_categoryID` (`distributorId`, `amenityID`, `categoryID`) )
 COLLATE='utf8_general_ci' ENGINE=MyISAM AUTO_INCREMENT=8; 

I am using Hbm like below :

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC

    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping>

<class

  name="ChannelAmenities"

  table="hofesoda.Channel_Amenities">

  <meta attribute="class-description" inherit="false">

  @hibernate.class

  table="hofesoda.Channel_Amenities"

    </meta>

  <id name="id" type="java.lang.Integer" column="id">

  <meta attribute="field-description">

  @hibernate.id

  generator-class="assigned"

  type="java.lang.Integer"

  column="id"

        </meta>

  <generator class="native" />

  </id>

  <composite-id>

  <meta attribute="field-description" inherit="false">

  @hibernate.id

  generator-class="assigned"

        </meta>

  <key-property name="distributorId" column="distributorId"

  type="java.lang.Integer" length="11">

  <meta attribute="distributorId">

  @hibernate.property

  column="distributorId"

            </meta>

  </key-property>

  <key-property name="amenityID" column="amenityID"

  type="java.lang.Integer" length="11">

  <meta attribute="field-description">

  @hibernate.property

  column="amenityID"

            </meta>

  </key-property>

  <key-property name="categoryID" column="categoryID"

  type="java.lang.Integer">

  <meta attribute="field-description">

  @hibernate.property

  column="categoryID"

            </meta>

  </key-property>

  </composite-id>

  <property name="amenityName" type="java.lang.String"

  column="amenityName">

  <meta attribute="field-description">

  @hibernate.property

  column="amenityName"

        </meta>

  </property>

  <property name="categoryName" type="java.lang.String"

  column="categoryName">

  <meta attribute="field-description">

  @hibernate.property

  column="categoryName"

        </meta>

  </property>

  </class>

</hibernate-mapping>

While using this above hbm showing as wrong.

I need table id as primary key which is autoincrement.

And (`distributorId`, `amenityID`, `categoryID`)  which are composite.

Please suggest me, How to Generate HBM for above Table.