Linux:
g_CMpDataID was removed, but its JNIEXPORT is still there; it is now applied to g_CMnBitsID, which is not used anywhere outside libawt

colorValueID is dead and can be removed

J2dTraceInit is exported by libawt, but never used outside the file it's declared in

Transform_GetInfo, Transform_transform, SurfaceData_GetOpsNoSetup, SurfaceData_SetOps are exported, but never used outside

X11SurfaceData_GetOps is exported by xawt and awt-headless, but not imported anywhere, can be hidden.

isNullScalerContext is only used internally by libfontmanager and can be hidden

getSunFontIDs is dead and can be removed

Windows:
GDIWinSD_InitDC, GDIWindowSurfaceData_GetComp, GDIWindowSurfaceData_GetOps, GDIWindowSurfaceData_GetOpsNoSetup, GDIWindowSurfaceData_GetWindow are not used outside of awt.dll