HTTP session migration
There are no programmatic changes required to migrate from version 5.x to version 6.x. This article describes features that are available after migration.
Migration from V5.x
Note: In Version 5 and later, default write frequency mode is TIME_BASED_WRITES, which is different from Version 4.0.x default mode of END_OF_SERVICE.When you migrate between releases of WebSphere Application Server V5.x and later and you are using a database for session persistence, we can share the session database table between releases. For example, if you are accessing applications that are on WAS version 5.x we can share the session id with applications running on V6.x.