Currently, AWT on Solaris uses "Sun's Xinerama API" which is non-standard API implemented in the libXext, we use it from 2001, but the standard version of "Xinerama API" was added Solaris in nv_62:
https://blogs.oracle.com/solaris/x11-apis-for-querying-multi-head-screen-layout-v2

I have checked that libXinerama.so.1 library exists on Solaris 11 Sparc and x64. The small test case confirms that it works.

If I will able to prove that JDK will work using this standard API, the old code can be removed.