FULL PRODUCT VERSION :
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux chris 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u3 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
The gradle "openZip" task assumes that the OpenJFX build will be unzipped over a pre-Jigsaw JRE layout.
When you try this with a post-Jigsaw build of OpenJDK the "jre" directory does not exist and OpenJFX is not correctly installed into OpenJDK.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Build OpenJFX using gradle openZip
Try to unzip the resulting build into JDK9

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The jars and native libs inside the zip are put in the right places.
ACTUAL -
Unzipping the openzip OpenJFX "overlay" creates jre directories inside JDK9 which is incorrect. JDK9 will not look in here for the JavaFX jars and libraries.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
chris@chris:~/jdk9dev/build/linux-x86_64-normal-server-release/jdk$ unzip openjfx-8u40-sdk-overlay-linux-amd64.zip
Archive: openjfx-8u40-sdk-overlay-linux-amd64.zip
  inflating: lib/javafx-mx.jar
  inflating: lib/packager.jar
  inflating: lib/ant-javafx.jar
  inflating: bin/javapackager
  inflating: bin/javafxpackager
   creating: man/
   creating: man/ja_JP.UTF-8/
   creating: man/ja_JP.UTF-8/man1/
  inflating: man/ja_JP.UTF-8/man1/javafxpackager.1
  inflating: man/ja_JP.UTF-8/man1/javapackager.1
   creating: man/man1/
  inflating: man/man1/javafxpackager.1
  inflating: man/man1/javapackager.1
   creating: jre/
   creating: jre/lib/
  inflating: jre/lib/javafx.properties
  inflating: jre/lib/jfxswt.jar
   creating: jre/lib/ext/
  inflating: jre/lib/ext/jfxrt.jar
   creating: jre/lib/amd64/
  inflating: jre/lib/amd64/libprism_sw.so
  inflating: jre/lib/amd64/libavplugin-54.so
  inflating: jre/lib/amd64/libdecora_sse.so
  inflating: jre/lib/amd64/libjavafx_font_pango.so
  inflating: jre/lib/amd64/libprism_common.so
  inflating: jre/lib/amd64/libfxplugins.so
  inflating: jre/lib/amd64/libjavafx_font_freetype.so
  inflating: jre/lib/amd64/libprism_es2.so
  inflating: jre/lib/amd64/libgstreamer-lite.so
  inflating: jre/lib/amd64/libjfxwebkit.so
  inflating: jre/lib/amd64/libjavafx_font.so
  inflating: jre/lib/amd64/libglass.so
  inflating: jre/lib/amd64/libjfxmedia.so
  inflating: jre/lib/amd64/libjavafx_iio.so
  inflating: jre/lib/amd64/libavplugin-53.so

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Manually copy the jars and libraries into the correct locations inside JDK9.