This is the same question that I asked in Re: Entity Beans, Transactions and
Locking.
Thomas Hofmann wrote:
> Hi,
>
> I have one simple question:
>
> Assume there are an entity bean A and two users (clients) U1 and U2. U1
> finds the bean A with ejbFindByPrimaryKey(PK). He intends to update the
> data represanted by bean A.
> How can U2 be informed that bean A will currently be updated by another
> user if he also wants to update bean A (must U1 do a ORA SELECT FOR UPDATE in
> the ejbFind.. method see
> above)? U2 should be able to read the data but he has to know that he
> cannot change the data (He is reading old data). If I use isolation
> level "TRANSACTION SERIALIZABLE" then U1 won't be able to read the data,
> will it ?
>
> This scenrio can happen inside a update/maintenance GUI dialog. But customers
> want be informed before they open the update dialog with a little message.
> The data is only for reading displayed !
>
> Any help will be appreciated
>
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