Re: getting null, in object transfer.

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 10 Jul 2007 09:44:48 +0100

Message-ID:

<f6vgu0$2u8$1@south.jnrs.ja.net>

prabodhachyutha@gmail.com wrote:

All,

Thanks for giving some suggestions, now we clearly got the information
on where is the actual problem is.

We are using swing client, where in we are calling the server using
the threads. Here the problem is 1. Two threads are calling the
server
2. Server is sending 2 objects as response(same type)
3. but both threads taking the same object (which is returned last) as
the input(not always)

We are not able to understand, Why this is happening?

What is the best way to resolve this.

Given that brief description my first assessment would be that you have a thread
symchronization problem in your servlet. It sounds like you are returning an
object which is shared between the multiple threads within the servlet (each
invocation of a servlet is likely to be on a different thread). Look at where
the object you are returning is defined. Is it within the service method? If
not then it is most likely shared between threads and must be synchronized.

Unfortunately it's impossible to be more specific without more specific details.

--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@ion.le.ac.uk
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555