Unfortunately 404 test was not consistent and non-trivial to adapt. I also couldn’t get the validation tests to work well either. Revisit if we have time to dig deeper into spring.
Otherwise it can interfere with the more common Servlet instrumentation (changing the root span name).
Unify attribute/property name for saving span on a request/context.
Also add tests for embedded GlassFish.
This ensures that `dd-tracng-ot` gets included into shadow jar.
Before this patch it was included only 'by accident' via some
transitive dependencies of some instrumentations.
Tyler Benson
Nikolay Martynov
Luca Abbati