One of JSSE classes has the following dependencies:

sun.security.ssl.JsseJce -> sun.security.ec.NamedCurve (sunec)
sun.security.ssl.JsseJce -> sun.security.ec.ECParameters (sunec)

This dependency creates a number of problems. First is the embedded case where the EC provider may not installed. Second is that it creates a split-package issue for Jigsaw/modularization as a small number of sun.security.ec classes end up in the base module, the rest in the sunec module.

See also 7194075 where some of the sun.security.ec classes are duplicated in rt.jar, this also needs to be fixed.