The biggest rock in the pond recently is the Great Renaming to Jakarta, but many containers still support the older package names.

The only real legacy stuff from 20 years ago that has truly died on the vine is Entity Beans. But even then, Entity Beans we’re mostly horrible, and not many folks used them.

But they may well still be supported in some modern containers.

That said the old style way of using XML for everything (notably declarations of Session Beans and such) still exists today. Annotations rule the day today, but the old XML style still exists, and has not been deprecated, or if it has, it’s quite recently.

There is in fact a lot of backward compatibility stuff still there in the modern containers because fundamentally the concepts have not changed, just how they are expressed in modern runtimes.