[papercrane]

> What does "GPL with classpath exception" mean in the real world, that JDK-itself changes must be upstreamed, but linked applications need not be? What are the limits there?

The exception is very broad and fairly simple.

Azul has a good breakdown of it https://www.azul.com/blog/why-the-classpath-exception-is-so-...

The short answer though is if you link to a GPL+Classpath exception library you may distribute the results under any license you choose.