Reported in the Oracle forum:
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I've just installed 7u6 b17 on OS X

I had an existing NB JavaFX application project that was already built. I decided to use it to test running javafxpackager manually. From my projects folder I ran this:
$ /Library/Java/JavaVirtualMachines/jdk1.7.0_06.jdk/Contents/Home/bin/javafxpackager -createjar -appclass mypackage.MyClass.class -srcdir build/classes/ -outfile MyApp.jar -v
Exception in thread "main" com.sun.javafx.tools.packager.PackagerException: Error: jfxrt.jar needs to be on classpath for -createbss and for -createJar without -nocss2bin
at com.sun.javafx.tools.packager.PackagerLib.loadClassFromRuntime(PackagerLib.java:1408)
at com.sun.javafx.tools.packager.PackagerLib.createBinaryCss(PackagerLib.java:1433)
at com.sun.javafx.tools.packager.PackagerLib.jar(PackagerLib.java:1340)
at com.sun.javafx.tools.packager.PackagerLib.jar(PackagerLib.java:1319)
at com.sun.javafx.tools.packager.PackagerLib.jar(PackagerLib.java:1319)
at com.sun.javafx.tools.packager.PackagerLib.jar(PackagerLib.java:1319)
at com.sun.javafx.tools.packager.PackagerLib.jar(PackagerLib.java:1319)
at com.sun.javafx.tools.packager.PackagerLib.jar(PackagerLib.java:1287)
at com.sun.javafx.tools.packager.PackagerLib.packageAsJar(PackagerLib.java:235)
at com.sun.javafx.tools.packager.Main.main(Main.java:410)
Caused by: java.lang.ClassNotFoundException: com.sun.javafx.css.parser.Css2Bin
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:789)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at com.sun.javafx.tools.packager.PackagerLib.loadClassFromRuntime(PackagerLib.java:1406)
... 9 more

Huh? javafxpackager doesn't know how to find jfxrt.jar either?