There are many considerations when moving applications from on-premise to cloud. It is critical to understand the benefits and also challenges of this migration. A successful migration will result in lower Total Cost of Ownership, yet offer the same or higher level of robustness.
In his session at 15th Cloud Expo, Michael Meiner, an Engineering Director at Oracle, Corporation, analyzed a range of cloud offerings (IaaS, PaaS, SaaS) and discussed the benefits/challenges of migrating to each offering as well as enterprise deployment considerations, including High Availability and Security. He demonstrated migrating to Amazon Elastic Cloud (EC2) and WebLogic Java Cloud Service using applications built using Tomcat and other J2EE vendors.