Application to application communication

Question

Hi,
Is there some way by which I can commmunicate (invoke methods) from one
web service to another webservice if they are deployed on the same weblogic
server. (i dont want to invoke them by using SOAP which will invoke them
over the internet..) can they invoke it straight away without doing a 'look
back' on the internet.
Or will i have to replicate the full functionality in all the applications
using that functionality and when a change is made i have to do the same in
all applications.
Please help.....this is really critical as otherwise i'll have to replicate
a lot of code.
Pankaj

Answer 1

Thank you for the fast response.
Actually I have a set of EJBs which are interacting with the backend
database.
these are part of a particular application which is deployed as an ear file.
now Another applicatio needs to query the same database tables but the
output is in a different format. Example of this is that the basic EJB which
is interacting with the Database is being invoked by a web service EJB which
need to expose some columns of the database.
Now as each web service in weblogic 6.1 is packaged as an .ear file (i.e. an
application) and I havent put the original jar file in weblogic's classpath,
the web service EJB are not able to find the core EJBs and it gives a
ClassNotFoundException while deploying.
Another example is there is another application which has EJBs interacting
with the core EJBs but exposing the tables in a administrator module. Now
this module has added functionality for doing insert/ update to the
database, but it using the core EJB for doing select queries as it has got
methods for doing select based on various criteria.
For modularity purpose and for performance both were packaged as different
applications. The core EJB application is deployed but the other appications
are not getting deployed as they are refering classes in the core EJB and it
gives a ClassNotFoundException.
I am using Weblogic 6.1 with SP2 and Oracle 8i as my database.
I'll be really greatful if you can help me out.
Thanks,
Pankaj
"Michael Wooten" <[email protected]> wrote in message
news:[email protected]...
>
Hi Pankaj,
Is there some way by which I can commmunicate (invoke methods) >from one
web
service to another webservice if they are deployed
on the same weblogic server.(i dont want to invoke them by >using SOAP
which
will invoke them
over the internet..)This is not entirely an accurate statement ;-) I agree that the HTTPprotocol
will be used, but this does not neccessarily neccessitate the use of "theinternet".
For example, the "http://localhost" does not use "the internet" ;-)
Or will i have to replicate the full functionality in all the
applications using that functionality and when a change is made
i have to do the same in all applications.Whoa. Sounds like you might want to rethink the "block diagram" for thearchitecture
you are using with these services ;-)
At its core, the implementation for an RPC-style WebLogic Web service isjust
a stateless session EJB. Which means that every "best practice" you knowabout
EJB-based applications, can be used here ;-) If you have web services that"share
functionality", you should be using J2EE patterns (or just plain old OODprinciples,
e.g. inheritance) to encapsulate it. See:
http://developer.java.sun.com/developer/technicalArticles/J2EE/patterns/
and
http://www.theserverside.com/books/EJBDesignPatterns/index.jsp
for specifics.
That, or package that functionality in a .jar file, and include it in thepath
assigned to the "-classpath" option, of the java command used to startWebLogic
Server.
Regards,
Mike Wooten
"Pankaj" <[email protected]> wrote:
Hi,
Is there some way by which I can commmunicate (invoke methods) from
one
web service to another webservice if they are deployed on the same
weblogic
server. (i dont want to invoke them by using SOAP which will invoke them
over the internet..) can they invoke it straight away without doing a
'look
back' on the internet.
Or will i have to replicate the full functionality in all theapplications
using that functionality and when a change is made i have to do the same
in
all applications.
Please help.....this is really critical as otherwise i'll have toreplicate
a lot of code.
Pankaj