Re: EnterpriseBean and finalize()

From:

=?windows-1252?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 02 Sep 2006 17:13:32 -0400

Message-ID:

<KtmKg.7594$_q4.2392@dukeread09>

Jono wrote:

I'm trying to learn EJB and picked up a copy of the book "SCBCD Exam
Study Kit" by Paul Sanghera. Inside it, I came across the following
sentence, which piqued my interest because I cannot see a) where this
can be found in the EJB 2.0 specification (actually, I was looking in
the J2EE 1.3 specification), or b) why finalizing a bean would be
interfering with the responsibilities of the container. Here's the
quote:

"... the bean class must not have any finalize() method because by
doing this you would be stepping on the container's toes, since it is
the responsibility of the container to manage the lifecycle, threads,
garbage collection, and so forth."

The EJB 2.1 spec has:

7.11.2 Session Bean Class
....
? The class must not define the finalize() method.

so it is in the spec.

Next question is why. EJB's has a long list of restrictions
on what they are allowed to use. The general intention is
to make sure that EJB are so well behaving that they will
work in all application servers and will not exhibit
bad characteristics compared to expectations of
a business component.

I can not see any specific reason for this particular
restriction.

But I can not see any reason to have a finalize method
either. It does not make any sense in the context an
EJB is used.

Arne