ant fails to create .deb with file associations set. When I create the application with it, install it and run xdg-open, it just opens gedit

/tmp/build.xml:


<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project xmlns:fx="javafx:com.sun.javafx.tools.ant" default="fx-deploy">
    <taskdef classpath="/local/work/appBundlerTests-8u40/lib/ant-javafx.jar" resource="com/sun/javafx/tools/ant/antlib.xml" uri="javafx:com.sun.javafx.tools.ant"/>
    <target name="fx-deploy">
        <fx:deploy nativeBundles="rpm" outdir="/tmp/testBundlerWorkDir867879599946131512" outfile="test" verbose="true">
            <fx:resources>
                <fx:fileset dir="/tmp/testBundlerWorkDir867879599946131512/jars" includes="rmApp.jar"/>
            </fx:resources>
            <fx:platform/>
            <fx:preferences/>
            <fx:application/>
            <fx:info>
                <fx:association description="The sample description" entension="foo bar" mimetype="application/example"/>
                <fx:association entension="baz qux" icon="/local/work/appBundlerTests-8u40/out/production/appBundlerTests-8u40/com/oracle/appbundlers/utils/resources/icon2png" mimetype="application/sample"/>
            </fx:info>
            <fx:bundleArgument arg="mainJar" value="rmApp.jar"/>
            <fx:bundleArgument arg="classpath" value="rmApp.jar"/>
        </fx:deploy>
    </target>
</project>

Log:
$ ant
Buildfile: /tmp/build.xml

fx-deploy:
No base JDK. Package will use system JRE.
Debian packages should specify a license. The absence of a license will cause some linux distributions to complain about the quality of the application.
  Using default package resource [menu icon] (add package/linux/RmApp.png to the class path to customize)
  Using default package resource [Menu shortcut descriptor] (add package/linux/RmApp.desktop to the class path to customize)
  Using default package resource [DEB control file] (add package/linux/control to the class path to customize)
  Using default package resource [DEB preinstall script] (add package/linux/preinst to the class path to customize)
  Using default package resource [DEB prerm script] (add package/linux/prerm to the class path to customize)
  Using default package resource [DEB postinstall script] (add package/linux/postinst to the class path to customize)
  Using default package resource [DEB postrm script] (add package/linux/postrm to the class path to customize)
  Using default package resource [DEB copyright file] (add package/linux/copyright to the class path to customize)
dpkg-deb: building package `rmapp' in `/tmp/testBundlerWorkDir867879599946131512/bundles/rmapp-1.0.deb'.
Package (.deb) saved to: /tmp/testBundlerWorkDir867879599946131512/bundles/rmapp-1.0.deb
  Config files are saved to /tmp/fxbundler8513901167024068845/linux. Use them to customize package.

BUILD SUCCESSFUL
Total time: 1 minute 33 seconds
$ sudo dpkg -i /tmp/testBundlerWorkDir867879599946131512/bundles/rmapp-1.0.deb
Selecting previously unselected package rmapp.
(Reading database ... 272015 files and directories currently installed.)
Preparing to unpack .../bundles/rmapp-1.0.deb ...
Unpacking rmapp (1.0) ...
Setting up rmapp (1.0) ...
Adding shortcut to the menu
$ touch temp.foo
$ xdg-open temp.foo
<gedit is opened>