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From Craig L Russell <Craig.Russ...@Sun.COM>
Subject Re: How to map multiple properties to same column as writable in jpa
Date Fri, 27 Jul 2007 14:53:11 GMT
Hi Saravanan,

The code snippet below doesn't look like the source of the problem.

Perhaps you could post all of the annotations for the fields in  
question? And try using OpenJPA...

Regards,

Craig

On Jul 26, 2007, at 9:28 PM, saravanan_tvm wrote:

>
> Hi,
> I am using toplink from oracle to support JPA.
> I have the following requirement...
> i have to map same column for multiple properties using @joincolumn
> annotation.. eg its something like this
>
> @joincolumn(name="PARENT_RECORD_ID")
> private Drug drug
>
> @joincolumn(name="PARENT_RECORD_ID")
> private Reaction reaction
>
> PARENT_RECORD_ID is nothing but primary key of parent table.
> but while accessing the application i am getting the following  
> exception....
>
>  MULTIPLE_WRITE_MAPPINGS_FOR_FIELD
>
> Cause: Multiple writable mappings for the field fieldName are  
> defined in the
> descriptor. Exactly one must be defined as writable; the others  
> must be
> specified as read-only. When multiple write mappings are defined  
> for the
> field, TopLink is unable to choose the appropriate mapping for  
> writing the
> value of the field in the database row. Therefore, the exception is  
> raised
> during the validation process of descriptors.
>
> Action: Make one of those mappings read-only
>
> But i cannot make read only, if i make read only then while  
> inserting new
> records it will be problem
>
> please can anyone provide the solution for this...
> Regards,
> Saravanan.
>
> -- 
> View this message in context: http://www.nabble.com/How-to-map- 
> multiple-properties-to-same-column-as-writable-in-jpa- 
> tf4155235.html#a11822480
> Sent from the OpenJPA Developers mailing list archive at Nabble.com.
>

Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:Craig.Russell@sun.com
P.S. A good JDO? O, Gasp!


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