Well, its probably best to implement equals() and hashCode() if you
plan on keeping it in a Set. But since Hibernate guarantees == is
preserved for objects in the same Session, even thats not vital,
as long as you are carefull not to mix and match objects from
different sessions. And its up to you to decide whether you should
use primary key values of property values to determine equality.
So basically theres nothing specific to Hibernate in your decision
to implement equals() or hashCode(). Usually I don't bother.
On the other hand, you *must* implement equals() and hashCode() for:
* a composite-id class
* a persistent class with an "embedded" composite-id
> Is it recommended that all hibernate persistent classes implement
> equals() and hashcode()? If so, is it possible to implement
> them in a base class? I'm doing this write now with the
> following toString() method and it works pretty well:
>
> public String toString() {
> StringBuffer results = new StringBuffer();
> Class clazz = getClass();
>
> results.append(getClass().getName() + "\n");
>
> Field[] fields = clazz.getDeclaredFields();
>
> try {
> AccessibleObject.setAccessible(fields, true);
>
> for (int i = 0; i < fields.length; i++) {
> results.append("\t" + fields[i].getName() + "=" +
> fields[i].get(this) + "\n");
> }
> } catch (Exception e) {
> // ignored!
> }
>
> return results.toString();
> }
>
> Thanks,
>
> Matt
>
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On
> > Behalf Of Gavin King
> > Sent: Sunday, December 29, 2002 4:09 AM
> > To: [EMAIL PROTECTED]
> > Subject: [Hibernate] CodeGenerator
> >
> >
> >
> > Hi everyone,
> >
> > I spent some time earlier today playing around with
> > CodeGenerator (a part of the codebase that I'm only
> > barely familiar with) and made some improvements.
> >
> > * The support for <composite-id> is now working
> > properly with composite id classes having
> > correctly generated hashCode() and equals()
> > methods.
> >
> > * All generated classes now implement toString()
> >
> > The generated classes now have a dependency upon
> commons-lang, which
> > doesn't bother me in the slightest, but other people may
> have another
> > opinion.
> >
> > The last thing I noticed, but didn't have time
> > to fix, is that subclass constructors are unaware
> > of superclass properties. We need to fix that
> > as soon as possible. If anyone has a chance to
> > address this, I would appreciate it.
> >
> > 1.2.1 should be released before the weekend.
> >
> > peace
> >
> > Gavin
> >
> >
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