Hello Gordon,
I don't understand it :confused:. I've deleted @Entity in the
ShoppingCartPropertiesDTO, but how is the @manytomany
in CustomerDTO ??
If I have the ShoppingCartPropertiesDTO without the @Entity than I get
following exception:
Exception Description: Missing descriptor for [ShoppingCartPropertiesDTO].
Verify that the descriptor has been properly registered with the Session.
Could you write what you mean, please ?
Gordon Yorke wrote:
>
> Hello,
> Yes you can map the ShoppingCartPropertiesDTO using the @ManyToMany
> annotation. The ShoppingCartPropertiesDTO will have to be marked as an
> Entity. Not marking the ShoppingCartPropertiesDTO as an Entity is most
> likely the cause of the exception you are seeing.
> --Gordon
>
> -----Original Message-----
> From: PLC_David [mailto:spaceman2k4_at_gmx.de]
> Sent: Monday, September 17, 2007 7:12 PM
> To: persistence_at_glassfish.dev.java.net
> Subject: ManyToMany with list of an utility class which contains the
> other objekt fur mapping and an additional attribute
>
>
>
> Hallo, I work with JPA for the first time.
>
> My database:
>
> Customer : ID | NAME | other columns
> Product : ID | DISCRIMINATOR | NAME |other columns | HARDWARE_INTERFACE |
> XML_ID
> Customer_Product_Rel: CUSTOMER_ID | PRODUCT_ID | AMOUNT
>
> My objects:
>
> @Entity
> CustomerDTO: attributes like id, name ... and
> List<ShoppingCartPropertiesDTO> products = new
> ArrayList<ShoppingCartPropertiesDTO>();
>
> ShoppingCartPropertiesDTO: private ProductDTO product = null; private
> Integer amount = null;
>
> @Entity
> @Inheritance(strategy=InheritanceType.SINGLE_TABLE)
> @DiscriminatorColumn(name = "DISCRIMINATOR", discriminatorType =
> DiscriminatorType.STRING, length = 2)
> abstract class Product: id, name ,descr, ...
>
> @Entity(name="SoftwareDTO")
> @DiscriminatorValue("SW")
> public class SoftwareDTO extends ProductDTO: private SystemRequirementsDTO
> systemRequirements = null; private String language = null;
>
>
> My question: Can I map the customer with a list of the additional object
> (ShoppingCartPropertiesDTO) which contains the product and the amount? And
> how is the ManyToMany annotation ?
>
>
>
> An additional question: What means the exception with missing descriptor
> ??
>
> Exception Description: Missing descriptor for [ShoppingCartPropertiesDTO].
> Verify that the descriptor has been properly registered with the Session.
> at
> oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:120)
> at
> oracle.toplink.essentials.internal.ejb.cmp3.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:60)
> at test.JPATester.runTest2(JPATester.java:186)
> Caused by: Exception [TOPLINK-7009] (Oracle TopLink Essentials - 2.0
> (Build
> b58g-fcs (09/07/2007))):
> oracle.toplink.essentials.exceptions.ValidationException
>
>
>
> Thanks for all posts
> David
>
>
>
> --
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> Sent from the java.net - glassfish persistence mailing list archive at
> Nabble.com.
>
>
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