Recently while I was upgrading a project in spring 2.5.6 to spring 3.0.5, happened to know that some libraries aren’t there anymore and some were renamed like spring-agent to spring-instrument…
Is there any site or a resource to refer to know these sort of changes done in migrating from spring 2 -3 ?
Yes, for most purposes, the Spring Upgrade Guide should provide you with what you need. In particular, check section 2.5 and 2.6 on the new packaging model.
If you are looking for a class that appears to be no longer available, try searching for it with FindJar. Some utility classes have been moved to another packages.