Dependency JAR debugging in JWS operation: Eager/Lazy downloads

Question

I'm trying to see if there is a way to watch which .JARs is downloaded as a program runs. However, if there are [import] statements in the main class, wouldn't the dependency .JARs be downloaded anyway? I just want to test the download patterns of a JWS application and see its results.
Specifically, I want to know when the JAR was downloaded in the course of runtime.
Currently, I have a main JAR and 3 dependency JARs; each JAR contains only one package with only one class within it. The main JAR will call methods from 2 of the 3 dependency JARs, which simply return strings to be printed to a console that is instantiated in the main class/JAR.
In the JNLP file, I will toy with the lazy/eager download settings for each of the dependency JARs, testing its behavior when each of the JARS are downloaded eagerly and lazily, with one of the JARs acting as control.
Is it possible to print the downloaded/not-downloaded status of each JAR to the console in my main class? Is there more I can do to this code so it can display whether or not JARs have been downloaded, and in what order?
//This is the main class. This will be declared as such in the JNLP.
package front;
import javax.swing.*;*
*import java.awt.*;
import java.io.*;
import right.RightOf;
import left.LeftOf;
import back.BackOf;
public class FrontOf extends JFrame{
ObjectOutputStream out;
private JTextArea consoleout;
public FrontOf(){
Container c = this.getContentPane();
consoleout = new JTextArea();
c.add(new JScrollPane(consoleout), BorderLayout.CENTER);
setSize( 300, 150 );
this.setVisible(true);
public void rockout(){ //The test operation. Note the dummy package's operations have been commented out.
RightOf unit01 = new RightOf();
LeftOf    unit02 = new LeftOf();
//BackOf    unit03 = new BackOf();
consoleout.append(unit01.go());
consoleout.append(unit02.go());
//consoleout.append(unit03.go());
public static void main(String args[]){
//This is code for one of the dependency classes/JARs. The other two are identical except for names and strings.
package left;
public class LeftOf {
    String debug;
    public LeftOf(){
        debug = new String("UNIT 01 ACTIVE");
    public String go(){
        return debug;

Answer 1

jkc532 wrote:
.. Is the fact that the CachedJarFile class doesn't attempt to reload the resource when it can't retrieve it from MemoryCache a bug? From your comprehensive investigation and report, it seems so to me.
..I've dug as deep as I can on this and I'm at wits end, does anybody have any ideas?Just after read the summary I was tired, so I have some understanding of the effort you have already invested in this (the 'wits' you have already spent). I think you should raise a bug report and seek Oracle's response.