Problem with internal HashMap was fixed after RC5. Try upgrading to latest.
The fact that two HerstellerImpl instances representing different database rows are
considered as identical may lead to more issues
whenever Map is used for caching. See if upgrading to latest will help, otherwise I
would externalize this logic into special
Comparator.
----- Original Message -----
From: "climber.chuck" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, March 22, 2004 1:31 PM
Subject: Problem with equals() and Identity
> Hi,
> I hope I don't ask something which has been answered several times.
> I am using the PersistenceBroker API (RC1.4) for some time and noticed a
> problem if I want to implement equals() and hashCode() in my business
> classes. For example:
>
> Class HerstellerImpl {
> String bezeichnung;
> ..
> public boolean equals(Object o) {
> if (this == o) {
> return true;
> }
> if (o == null) {
> return false;
> }
> if (o.getClass() != this.getClass()) {
> return false;
> }
> HerstellerImpl h = (HerstellerImpl) o;
>
> if (!this.getBezeichnung().equals(h.getBezeichnung())) {
> return false;
> }
> return true;
> }
> // hashCode() in the same manner
> }
>
> Mapping Definition:
> <!-- Definitions for de.jas.kassart.model.HerstellerImpl -->
> <class-descriptor
> class="de.jas.kassart.model.HerstellerImpl"
> table="HERSTELLER"
> >
> <field-descriptor
> name="_id"
> column="ID"
> jdbc-type="SMALLINT"
> primarykey="true"
> autoincrement="true"
> access="anonymous"
> />
> <field-descriptor
> name="bezeichnung"
> column="BEZEICHNUNG"
> jdbc-type="CHAR"
> />
> </class-descriptor>
>
> Now if I want to store an object which has already been stored and
> which's bezeichnung has changed, OJB produces an insert statement
> instead of an update statement.
> I am not sure but I think the reason is that Identity(object, broker,
> cld) does retrieve a new database key because AbstractPersistentField
> uses a HashMap for storing objects. After changing bezeichnung equals()
> and hashCode() produce new entries in this Map.
> Has anybody had the same problems? Have I misunderstood something? Thank
> you for every help!
> Andreas Marx
>
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