Steps to reproduce.
1. please find the attachment for ant files.
2. try to execute attached ant files as per SCENARIO's mentioned below.

/export/home/gtee/ramesh/jdk9developerbuild/bin/java -version
java version "9-internal"
Java(TM) SE Runtime Environment (fastdebug build 9-internal+0-2016-09-21-113038.cbensen.jdk9udev)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 9-internal+0-2016-09-21-113038.cbensen.jdk9udev, mixed mode)

TEST CASE SCENARIOS

SCENARIO 1.
ant -verbose -f normalJarPKG.xml
Apache Ant(TM) version 1.9.7 compiled on April 9 2016
Buildfile: /export/home/gtee/ramesh/antfiles/normalJarPKG.xml
Detected Java version: 1.9 in: /export/home/gtee/ramesh/jdk9developerbuild
Detected OS: Mac OS X
parsing buildfile /export/home/gtee/ramesh/antfiles/normalJarPKG.xml with URI = file:/export/home/gtee/ramesh/antfiles/normalJarPKG.xml
Project base dir set to: /export/home/gtee/ramesh/antfiles
parsing buildfile jar:file:/export/home/gtee/ramesh/apache-ant-1.9.7/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/export/home/gtee/ramesh/apache-ant-1.9.7/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file
parsing buildfile jar:file:/export/home/gtee/ramesh/jdk9developerbuild/lib/ant-javafx.jar!/com/sun/javafx/tools/ant/antlib.xml with URI = jar:file:/export/home/gtee/ramesh/jdk9developerbuild/lib/ant-javafx.jar!/com/sun/javafx/tools/ant/antlib.xml from a zip file
 [macrodef] creating macro javafx:com.sun.javafx.tools.ant:init-ant
Build sequence for target(s) `fx-deploy' is [fx-deploy]
Complete build sequence is [fx-deploy, ]

fx-deploy:
Building PKG package for SwingHello
"Adding modules: [] to runtime image."
Exception: jdk.tools.jlink.plugin.PluginException: java.lang.module.ResolutionException: Module not found

BUILD FAILED
/export/home/gtee/ramesh/antfiles/normalJarPKG.xml:5: Error: Bundler "PKG Installer" (pkg) failed to produce a bundle.
        at com.sun.javafx.tools.ant.DeployFXTask.execute(DeployFXTask.java:345)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base/Native Method)
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base/NativeMethodAccessorImpl.java:62)
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base/DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(java.base/Method.java:535)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:435)
        at org.apache.tools.ant.Target.performTasks(Target.java:456)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
        at org.apache.tools.ant.Main.runBuild(Main.java:854)
        at org.apache.tools.ant.Main.startAnt(Main.java:236)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:112)
Caused by: com.sun.javafx.tools.packager.PackagerException: Error: Bundler "PKG Installer" (pkg) failed to produce a bundle.
        at com.sun.javafx.tools.packager.PackagerLib.generateNativeBundles(jdk.packager/PackagerLib.java:373)
        at com.sun.javafx.tools.packager.PackagerLib.generateDeploymentPackages(jdk.packager/PackagerLib.java:348)
        at com.sun.javafx.tools.ant.DeployFXTask.execute(DeployFXTask.java:339)
        ... 17 more

Total time: 3 seconds


SCENARIO 2.
ant -verbose -f normalJardmg.xml
Apache Ant(TM) version 1.9.7 compiled on April 9 2016
Buildfile: /export/home/gtee/ramesh/antfiles/normalJardmg.xml
Detected Java version: 1.9 in: /export/home/gtee/ramesh/jdk9developerbuild
Detected OS: Mac OS X
parsing buildfile /export/home/gtee/ramesh/antfiles/normalJardmg.xml with URI = file:/export/home/gtee/ramesh/antfiles/normalJardmg.xml
Project base dir set to: /export/home/gtee/ramesh/antfiles
parsing buildfile jar:file:/export/home/gtee/ramesh/apache-ant-1.9.7/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/export/home/gtee/ramesh/apache-ant-1.9.7/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file
parsing buildfile jar:file:/export/home/gtee/ramesh/jdk9developerbuild/lib/ant-javafx.jar!/com/sun/javafx/tools/ant/antlib.xml with URI = jar:file:/export/home/gtee/ramesh/jdk9developerbuild/lib/ant-javafx.jar!/com/sun/javafx/tools/ant/antlib.xml from a zip file
 [macrodef] creating macro javafx:com.sun.javafx.tools.ant:init-ant
Build sequence for target(s) `fx-deploy' is [fx-deploy]
Complete build sequence is [fx-deploy, ]

fx-deploy:
Building DMG package for SwingHello
"Adding modules: [] to runtime image."
Exception: jdk.tools.jlink.plugin.PluginException: java.lang.module.ResolutionException: Module not found

BUILD FAILED
/export/home/gtee/ramesh/antfiles/normalJardmg.xml:5: Error: Bundler "DMG Installer" (dmg) failed to produce a bundle.
        at com.sun.javafx.tools.ant.DeployFXTask.execute(DeployFXTask.java:345)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base/Native Method)
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base/NativeMethodAccessorImpl.java:62)
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base/DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(java.base/Method.java:535)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:435)
        at org.apache.tools.ant.Target.performTasks(Target.java:456)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
        at org.apache.tools.ant.Main.runBuild(Main.java:854)
        at org.apache.tools.ant.Main.startAnt(Main.java:236)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:112)
Caused by: com.sun.javafx.tools.packager.PackagerException: Error: Bundler "DMG Installer" (dmg) failed to produce a bundle.
        at com.sun.javafx.tools.packager.PackagerLib.generateNativeBundles(jdk.packager/PackagerLib.java:373)
        at com.sun.javafx.tools.packager.PackagerLib.generateDeploymentPackages(jdk.packager/PackagerLib.java:348)
        at com.sun.javafx.tools.ant.DeployFXTask.execute(DeployFXTask.java:339)
        ... 17 more

Total time: 3 seconds


SCENARIO 3.
ant -verbose -f normalJarimage.xml
Apache Ant(TM) version 1.9.7 compiled on April 9 2016
Buildfile: /export/home/gtee/ramesh/antfiles/normalJarimage.xml
Detected Java version: 1.9 in: /export/home/gtee/ramesh/jdk9developerbuild
Detected OS: Mac OS X
parsing buildfile /export/home/gtee/ramesh/antfiles/normalJarimage.xml with URI = file:/export/home/gtee/ramesh/antfiles/normalJarimage.xml
Project base dir set to: /export/home/gtee/ramesh/antfiles
parsing buildfile jar:file:/export/home/gtee/ramesh/apache-ant-1.9.7/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/export/home/gtee/ramesh/apache-ant-1.9.7/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file
parsing buildfile jar:file:/export/home/gtee/ramesh/jdk9developerbuild/lib/ant-javafx.jar!/com/sun/javafx/tools/ant/antlib.xml with URI = jar:file:/export/home/gtee/ramesh/jdk9developerbuild/lib/ant-javafx.jar!/com/sun/javafx/tools/ant/antlib.xml from a zip file
 [macrodef] creating macro javafx:com.sun.javafx.tools.ant:init-ant
Build sequence for target(s) `fx-deploy' is [fx-deploy]
Complete build sequence is [fx-deploy, ]

fx-deploy:
Creating app bundle: /export/home/gtee/ramesh/outdir123image/SwingHello.app
"Adding modules: [] to runtime image."
Exception: jdk.tools.jlink.plugin.PluginException: java.lang.module.ResolutionException: Module not found

BUILD FAILED
/export/home/gtee/ramesh/antfiles/normalJarimage.xml:5: Error: Bundler "Mac Application Image" (mac.app) failed to produce a bundle.
        at com.sun.javafx.tools.ant.DeployFXTask.execute(DeployFXTask.java:345)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base/Native Method)
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base/NativeMethodAccessorImpl.java:62)
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base/DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(java.base/Method.java:535)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:435)
        at org.apache.tools.ant.Target.performTasks(Target.java:456)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
        at org.apache.tools.ant.Main.runBuild(Main.java:854)
        at org.apache.tools.ant.Main.startAnt(Main.java:236)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:112)
Caused by: com.sun.javafx.tools.packager.PackagerException: Error: Bundler "Mac Application Image" (mac.app) failed to produce a bundle.
        at com.sun.javafx.tools.packager.PackagerLib.generateNativeBundles(jdk.packager/PackagerLib.java:373)
        at com.sun.javafx.tools.packager.PackagerLib.generateDeploymentPackages(jdk.packager/PackagerLib.java:348)
        at com.sun.javafx.tools.ant.DeployFXTask.execute(DeployFXTask.java:339)
        ... 17 more

Total time: 3 seconds