Interfacing Java application through web

Hi,
I have a Java application running in the client server.
I need to access the application through web.

Which technology should i use?ASP.net or Java?

I should be able to interact with the tool through internet

Please provide me answer.
thanx in advance

I am new to Java so Please do tell me a feasible way to do this??

What kind of application?

What will it do? Who is the target audience?