When javapackager is started with just absolute path of it and with incompatible (old) java in PATH, it fails with such an error:

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/sun/javafx/tools/packager/Main : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

Clearly, this is caused by using incorrect java from PATH.

Steps to reproduce:
1) Install, for example, JDK 7 and set up it's executables in the PATH variable
2) Run "javapackager -version" (for old releases: javafxpackager) from the new release (for instance, JDK 8u20)
3) Get the error