passing object refernce

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micro - 20 Apr 2007 06:45 GMT

hi,
I have two java applications one of them is kind of a plug in to the
other .so I want to pass an object reference from the first one to the
other (the plug in) .
passing a copy of that object is not what I want , I need to pass the
exact object reference.
any one can help me
thanks.

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Philipp Leitner - 20 Apr 2007 09:26 GMT

> passing a copy of that object is not what I want , I need to pass the
> exact object reference.

I figure that you mean that both these applications are running in
different address spaces (different VMs)? In that case it is for
obvious reasons not possible to simply pass a reference between the
applications - no application can "peek" into the address space of a a
different application. You have to using some kind of inter-process
communication technology (like RMI) to make these applications
communicate.

/philipp

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micro - 20 Apr 2007 09:37 GMT

> > passing a copy of that object is not what I want , I need to pass the
> > exact object reference.
>
> I figure that you mean that both these applications are running in
> different address spaces (different VMs)?

each one of the two has main() function , do they run in different
VMs?

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santax - 20 Apr 2007 10:18 GMT

> > > passing a copy of that object is not what I want , I need to pass the
> > > exact object reference.
[quoted text clipped - 4 lines]
> each one of the two has main() function , do they run in different
> VMs?

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Andrew Thompson - 20 Apr 2007 10:23 GMT

Philipp Leitner wrote:

>> > passing a copy of that object is not what I want , I need to pass the
>> > exact object reference.
[quoted text clipped - 4 lines]
>each one of the two has main() function , do they run in different
>VMs?

It depends on how they are launched. If boh are launched
from the command line, then yes. OTOH, if one is launched,
and it calls the main() of the other, they should both be
running in the same VM instance.

Signature

Andrew Thompson
http://www.athompson.info/andrew/

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micro - 20 Apr 2007 10:58 GMT

> Philipp Leitner wrote:
> >> > passing a copy of that object is not what I want , I need to pass the
[quoted text clipped - 10 lines]
> and it calls the main() of the other, they should both be
> running in the same VM instance.

actually one of them (lets call A)launch and in some point it calls
Runtime.exec() to make the other(lets call B) star
B needs a reference to an object that is initiated by A

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Philipp Leitner - 20 Apr 2007 11:12 GMT

> actually one of them (lets call A)launch and in some point it calls
> Runtime.exec() to make the other(lets call B) star
> B needs a reference to an object that is initiated by A

Runtime.exec() starts a new subprocess. AFAIK this subprocess will run
in it's own VM, just as if you had launched it yourself from the
command line.

/philipp

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Andrew Thompson - 20 Apr 2007 12:25 GMT

micro wrote:

>> actually one of them (lets call A)launch and in some point it calls
>> Runtime.exec() to make the other(lets call B) star
[quoted text clipped - 3 lines]
>in it's own VM, just as if you had launched it yourself from the
>command line.

If that is the case (don't know, and could not be bothered
checking) it might be better to get an instance of 'B' and
call the main(), as I alluded to earlier. In that case..
a) Both will be running in the same VM.
b) 'A' will have a reference to 'B', and can call the public methods.
(so B.setTheObjectOfInterest( theObject ) should work just fine.)

Signature

Andrew Thompson
http://www.athompson.info/andrew/

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A. Bolmarcich - 21 Apr 2007 03:11 GMT

>> Philipp Leitner wrote:
>> >> > passing a copy of that object is not what I want , I need to pass the
[quoted text clipped - 14 lines]
> Runtime.exec() to make the other(lets call B) star
> B needs a reference to an object that is initiated by A

This may be a job for Java Remote Method Invocation. Please the
the tutorial at

http://java.sun.com/docs/books/tutorial/rmi/index.html

to determine if Java RMI supports what you what B to be able to
do with the object in the JVM running A.

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passing object refernce

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