Oracle has released working Early Access (EA) builds of Java 9 for the Raspberry Pi (RPi), but pulled them at the General Availability (GA) release moment. Now they're sending "cease and desist letters" to block people from offering the EA builds to others by means of a DMCA request (See this article).
Their only statement about why they did this, is that Oracle focuses on the future. As if IoT isn't in the future. (see Mark Reinhold's Twitter)
It is all the more weird because the director of the Oracle technology network (OTN), Stephen Chin evangelized and gave trainings about how to run Java 9 on the RPi (see: Java 9 on RPi training).
It seems that Oracle dropped Java support for IoT developers. No Oracle Java for them.