Generation only supported with single PK field

[cycchow]

My entity bean have a compound key but when i deploy, the jboss always throw this exception:
what does it mean?

2005-01-25 11:19:20,737 WARN [org.jboss.system.ServiceController] Problem starting service jboss.j2ee:jndiName=cotonenfant.ProductColor,service=EJB
org.jboss.deployment.DeploymentException: Generation only supported with single PK field


the following is my code

package com.cotonenfant.ejb;

import javax.ejb.EntityBean;
import javax.ejb.EntityContext;
import javax.ejb.RemoveException;

/**
 * @ejb.bean
 * name = "ProductColor"
 * local-jndi-name = "cotonenfant.ProductColor"
 * view-type = "local"
 * type = "CMP"
 * cmp-version = "2.x"
 * @ejb.util generate = "physical"
 * @ejb.finder
 * view-type = "local"
 * description = "findAll"
 * signature = "java.util.Collection findAll()"
 * result-type-mapping = "Local"
 * method-intf = "LocalHome"
 * @ejb.finder
 * view-type = "local"
 * signature="java.util.Collection findByProduct(java.lang.Integer pid)"
 * query="SELECT OBJECT(p) FROM ProductColor AS p WHERE p.productId=?1"
 * result-type-mapping="Local"
 * method-intf="LocalHome"
 */

public abstract class ProductColorBean extends BaseEntityBean implements
 EntityBean {

 /**
 * @ejb.persistence
 * jdbc-type = "INTEGER"
 * column-name = "product_id"
 * sql-type = "integer"
 * @ejb.pk-field
 */

 public abstract java.lang.Integer getProductId();

 public abstract void setProductId(java.lang.Integer productId);

 /**
 * @ejb.persistence
 * jdbc-type = "VARCHAR"
 * column-name = "color"
 * sql-type = "varchar(10)"
 * @ejb.pk-field
 */
 public abstract java.lang.String getColorCode();

 public abstract void setColorCode(java.lang.String colorCode);

 /**
 * @ejb.persistence
 * jdbc-type = "VARCHAR"
 * column-name = "size"
 * sql-type = "varchar(10)"
 * @ejb.pk-field
 */
 public abstract java.lang.String getSize();

 public abstract void setSize(java.lang.String size);

 /**
 * @ejb.persistence
 * jdbc-type = "INTEGER"
 * column-name = "qty"
 * sql-type = "integer"
 */
 public abstract java.lang.Integer getQty();

 public abstract void setQty(java.lang.Integer qty);

 /**
 * @ejb.persistence
 * jdbc-type = "INTEGER"
 * column-name = "qty_sold"
 * sql-type = "integer"
 */
 public abstract java.lang.Integer getQtySold();

 public abstract void setQtySold(java.lang.Integer qtySold);

 public com.cotonenfant.ejb.pk.ProductColorPK ejbCreate(com.cotonenfant.
 dataobjects.ProductColorData data) throws javax.ejb.CreateException {
 this.setProductId(data.getProductId());
 this.setColorCode(data.getColorCode());
 this.setSize(data.getSize());
 this.setData(data);
 return null;
 }

// public void ejbPostCreate(com.cotonenfant.dataobjects.ProductColorData data) {
// }

 /**
 * @ejb:interface-method view-type="both"
 */
 public abstract com.cotonenfant.dataobjects.ProductColorData getData();

 /**
 * @ejb:interface-method view-type="both"
 */
 public abstract void setData(com.cotonenfant.dataobjects.ProductColorData data);

}

/*
 * Generated by XDoclet - Do not edit!
 */
package com.cotonenfant.ejb.pk;

/**
 * Primary key for ProductColor.
 */
public class ProductColorPK
 extends java.lang.Object
 implements java.io.Serializable
{

 public java.lang.Integer productId;
 public java.lang.String colorCode;
 public java.lang.String size;

 public ProductColorPK()
 {
 }

 public ProductColorPK( java.lang.Integer productId,java.lang.String colorCode,java.lang.String size )
 {
 this.productId = productId;
 this.colorCode = colorCode;
 this.size = size;
 }

 public java.lang.Integer getProductId()
 {
 return productId;
 }
 public java.lang.String getColorCode()
 {
 return colorCode;
 }
 public java.lang.String getSize()
 {
 return size;
 }

 public void setProductId(java.lang.Integer productId)
 {
 this.productId = productId;
 }
 public void setColorCode(java.lang.String colorCode)
 {
 this.colorCode = colorCode;
 }
 public void setSize(java.lang.String size)
 {
 this.size = size;
 }

 public int hashCode()
 {
 int _hashCode = 0;
 if (this.productId != null) _hashCode += this.productId.hashCode();
 if (this.colorCode != null) _hashCode += this.colorCode.hashCode();
 if (this.size != null) _hashCode += this.size.hashCode();

 return _hashCode;
 }

 public boolean equals(Object obj)
 {
 if( !(obj instanceof com.cotonenfant.ejb.pk.ProductColorPK) )
 return false;

 com.cotonenfant.ejb.pk.ProductColorPK pk = (com.cotonenfant.ejb.pk.ProductColorPK)obj;
 boolean eq = true;

 if( obj == null )
 {
 eq = false;
 }
 else
 {
 if( this.productId != null )
 {
 eq = eq && this.productId.equals( pk.getProductId() );
 }
 else // this.productId == null
 {
 eq = eq && ( pk.getProductId() == null );
 }
 if( this.colorCode != null )
 {
 eq = eq && this.colorCode.equals( pk.getColorCode() );
 }
 else // this.colorCode == null
 {
 eq = eq && ( pk.getColorCode() == null );
 }
 if( this.size != null )
 {
 eq = eq && this.size.equals( pk.getSize() );
 }
 else // this.size == null
 {
 eq = eq && ( pk.getSize() == null );
 }
 }

 return eq;
 }

 /** @return String representation of this pk in the form of [.field1.field2.field3]. */
 public String toString()
 {
 StringBuffer toStringValue = new StringBuffer("[.");
 toStringValue.append(this.productId).append('.');
 toStringValue.append(this.colorCode).append('.');
 toStringValue.append(this.size).append('.');
 toStringValue.append(']');
 return toStringValue.toString();
 }

}