Migrating application programming interfaces (APIs) and specifications involves moving to the current Java™ component level as well as to other technologies that WebSphere® Application Server Version 7.0 supports. If your existing applications currently support different specification levels than are supported by this version of the product, it is likely that you must update at least some aspects of the applications to comply with the new specifications.
In many cases, IBM® provides additional features and customization options that extend the specification level even further. If your existing applications use IBM extensions from earlier product versions, it might be necessary for you to perform mandatory or optional migration to use the same kinds of extensions in Version 7.0.
Read the "Specifications and API documentation" article in the information center for a summary of the specifications and API documentation supported in current and prior product releases.
For more information on the items deprecated in WebSphere Application Server Version 7.0, read the "Deprecated, stabilized, and removed features" article in the information center.