Concerns on migrating Web Application (.war) deployment on Websphere 7.0 from Tomcat 7.0

We have a web application which works with Tomcat 7.0.23. We are evaluating the WAS 7.0 for deploying the application.

1.

Can anyone guide us the challenges which will be faced during the migration?

2.

Do we need to maintain the separate war file for executing the code on Tomcat7 and WAS7 or Is it fine to compile the code with SUN JDK and run on IBM JDK

3.

Which are the feature that are Supported by Tomcat 7 but not supported by WAS7Thanks in advance.
secloreAsked:
Who is Participating?
 
Gary PattersonVP Technology / Senior Consultant Commented:
IBM Websphere 7 Migration docs:

http://www-01.ibm.com/support/docview.wss?uid=swg27008729

- Gary Patterson
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