Re: Executing multiple methods on same java instance

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Wed, 02 May 2007 22:12:40 -0400

Message-ID:

<46394518$0$90262$14726298@news.sunsite.dk>

lourduraj.s@gmail.com wrote:

I have a scenario where based on some config parameters, I create
an appropriate Business class instance using java reflection and
invoke a specific method. Now to avoid creating instances for each
request using reflection, I place the java object in a Hashmap once I
create it and serve the class from there.

1. Now I am not sure if doing this would cause threading issues or any
other issues, if there are simultaneous requests to the same Business
class instance. What would be the behaviour in that case?

Reflection does not influence thread safety.

If multiple threads access the code it should be written
to be thread safe.

2. If my Business class were an Stateless EJB and I store the EJB Home
object reference in a Hashmap and serve it for all requests, will it
also cause issues?

The EJB container will make sure that only one thread uses a
bean object at a time, but you will (unless you tell the EJB container
not to) get multiple bean objects.

It is impossible to say from your description whether that
is a problem or not.

Arne