FULL PRODUCT VERSION :
java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)
iMac2:~ russ$


ADDITIONAL OS VERSION INFORMATION :
OS/X 10.11.5

EXTRA RELEVANT SYSTEM CONFIGURATION :
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)

A DESCRIPTION OF THE PROBLEM :
When the following program is packaged and installed in the Applications folder, then installed as a file open action either as a mime default or as the target of a folder open action, the program shows no arguments when it should show one or more arguments. I have tested it with several different scenarios. When run from the IDE with an argument supplied, it works as expected.

package demomissingargs;

import java.io.PrintWriter;
import java.io.StringWriter;
import javax.swing.JOptionPane;

/**
 *
 * @author russ
 */
public class DemoMissingArgs
{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        pw.format("Num Args: %d\n",args.length);
        for (String s : args)
        {
            pw.println(s);
        }
        JOptionPane.showMessageDialog(null, sw.toString(), "Args", JOptionPane.INFORMATION_MESSAGE);
        System.exit(0);
    }
    
}

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the program shown, package as an Image Only, move the image to the Application's folder and set it as the default application handler for a file, then double click that file from the Finder.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The program should show one argument and display the file name of the file chosen.
ACTUAL -
The program shows the number of arguments to be 0.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package demomissingargs;

import java.io.PrintWriter;
import java.io.StringWriter;
import javax.swing.JOptionPane;

/**
 *
 * @author russ
 */
public class DemoMissingArgs
{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        pw.format("Num Args: %d\n",args.length);
        for (String s : args)
        {
            pw.println(s);
        }
        JOptionPane.showMessageDialog(null, sw.toString(), "Args", JOptionPane.INFORMATION_MESSAGE);
        System.exit(0);
    }
    
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
None found.