public ProductPK ejbCreate(String productID, String name, String description, double basePrice) throws CreateException{
System.out.println("ejbCreate() called");

setProductId(productID);
setName(name);
setDescription(description);
setBasePrice(basePrice);

return new ProductPK(productID);
}

public String ejbCreate(String productID, String name, String description, double basePrice) {

    System.out.println("ejbCreate() called");

    setProductID(productID);

    setName(name);

    setDescription(description);

    setBasePrice(basePrice);

    return productID;

  }

ERROR: Error from ejbc: In EJB Product, the ejbCreate method: ejbCreate(java.lang.String,
java.lang.String,java.lang.String,double) must return the primary key type.

public String ejbCreate(ProductPK productID, String name,
String description, double basePrice)
throws CreateException {
System.out.println("ejbCreate() called");
setProductID(productID);
setName(name);
setDescription(description);
setBasePrice(basePrice);
return new ProductPK(productID);
}

public String ejbCreate(String productID, String name,
String description, double basePrice) {
setProductID(productID);
setName(name);
setDescription(description);
setBasePrice(basePrice);
return productID;
}

环境weblogic 8.1 sp1

偶想知道＂标记为红色的部分＂这么写有什么差别...

package examples;

import java.io.Serializable;

/**

 * Primary Key class for our 'Product' Container-Managed

 * Entity Bean

 */

public class ProductPK implements java.io.Serializable {

  /*

   * Note that the primary key fields must be a

   * subset of the the container-managed Bean fields.

   * The fields we are marking as container-managed in

   * our Bean are productID, name, desc, and basePrice.

   * Therefore our PK fields need to be from that set.

  */

  public String productID;

  public ProductPK(String productID) {

    this.productID = productID;

  }

  public ProductPK() {

  }

  public String toString() {

    return productID.toString();

  }

  public int hashCode()

  {

        return productID.hashCode();

  }

  public boolean equals(Object prod)

  {

        return ((ProductPK)prod).productID.equals(productID);

  }  

}