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interface a legacy system with weblogic

 
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is it possible to interface a weblogic application with a legacy system application say a application running on AS/400 ? How it is possible ?
 
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Many organisations use CORBA to support their distributed legacy applications. As far as WebLogic is concerned, here is an example of a sample architecture (using BEA stuff):
WebLogic (application) Server supplies access to components through its J2EE facilities.
WebLogic (application) Server components connect to the legacy system through a CORBA ORB, which provides language independent access to services.
You would wrap your AS/400 legacy app with WebLogic Enterprise Server (assuming BEA provides WLE for AS/400), which provides both EJB support and CORBA services. Your CORBA services would be written in C++ for example and you could interface with C functions therein.
It's very possible to tie a WLS system and a WLE system together.
If you want to find out more about CORBA, we also have a CORBA/RMI forum here at JavaRanch.
I hope that helps.
 
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