Migrating application from websphere to tomcat

Question

I will be migrating a websphere application to tomcat. I've read these online docs - http://blogs.mulesoft.org/how-to-migrate-your-weblogic-or-websphere-app-to-tomcat/ & http://www.mulesoft.com/downloads/Migrating-from-Websphere-to-Tomcat-Mulesoft.pdf

I also found this helpful - What are the differences when deploying on Tomcat vs. Websphere?

From reading these docs it seems like it's a not too difficult task, at least on the face of it. So any J2ee/EE functionality that the app is using which tomcat does not implement needs to be added manually, this may include changes to the code base to support the tomcat server.

2. Are there any technical details/pitfalls I should watch out for during migration?

3. How can I effectively estimate the amount of time this migration should take ?

Answer 1

Tomcat is just servlet container and lacks most of the WAS features. For any feature you are missing you will have to expand tomcat functionality by adding stuff like transactional managers, jpa, ejb container, mail service....

So your task may or may be not hard to execute. It primary depends on your application (is it a webapp?) and your tomcat skills.

If you have a large Java EE application, and no experience in doing this, I would recommend to change your goal and instead target JBossAS, Glassfish or some other Java EE AS instead.