Integrating Excel with Java

Hi,
How can Excel be integrated with Java such that if a user is working on an Excel , my Java application should be able to capture all the events from Excel Sheet.
I have looked into POI, but it seems to me , it can read and wriite to Excel from Java, but i would like that if a user is making changes to a spredsheet then my Java Application should be notified about those changes
In short, i would like to expose front end of a web application in Execl!
Is there any open source package that can help in doing the integration
Kindly share your views/ suggestions

jschell wrote:
If you just want most of what is occuring in Excel only then there are probably events in the Excel API (OLE >probably) that allow you to modify and react to changes. In my experience figuring out how to do that is very >difficult even for small bits of functionality.Can u please explain a little more on this.
Can i use JNI to listen to COM server, probaly if i create some proxies for Excel that use JNI to listen to COM Server.
I found a link on the internet http://www.ibm.com/developerworks/java/library/j-bridge/
This Java bridge can integrate COM objects into their applications. But i am not sure if i can capture the live stuff from an Excel file when somebody is editing it.
Also i would like to know, what should be the best stratergy when i would like to expose the Front end of an application in Excel , since the application involves a lot of numbers and users are more comfortable with Excel interface, and the rest of the application you want in Java.
Kindly share your views on this!

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