Well, as we all know Oracle are not allowing the release a binary version of Java 9,10 and may be 11 on Oracle Solaris x64 at this time (SPARC version downloadable). We can all guess why but I hope that they will release a x86 version soon.
Anyway, if you want to keep up with everyone else you can build the OpenJDK version.
It builds under Oracle Solaris x64 and SPARC (saying that having problem with SPARC version at this time). Full build information is here.