Multiple-jar applet question

Here's a basic question that none of the examples seem to address. If my applet is comprised of multiple jars (some dynamically loaded based on system configuration), do they all have to be signed, or does just the jar file containing the applet entry point need to be signed?
Conversely, could it be that only the jar files that contain code that wants to write files to the local file system need to be signed, or does everything need to be signed?

Conversely, could it be that only the jar files that contain code that wants to write files to
the local file system need to be signedThe Stack needs to be "trusted" code. If an unsigned applet "not trusted" calls a method
of the signed applet it should not be allowed to do "trusted" things.
One example is when you call a public method of the applet from javascript. There is a
sollution other that signing all.
http://forum.java.sun.com/thread.jsp?forum=63&thread=524815
second post

Similar Messages

How to use an Applet with multiple-jars

Hi everybody,
I would like to use an applet with multiple-jars.
ex:
<applet codebase="." archive="main.jar,Addon1.jar,Addon2.jar" code="Appl.class" id="MyTest" width="600" height="30">
     <param name = "MyParam" value = "1;2">
</applet>
An applet with :
-> 1 Main JAR
-> X Addon JARs (X : a parameter "PRM")
My main part knows the parameter "PRM" -> knows which addon to use
My question is, how do I use classes from addons, inside the main part (and vise-versa if possible) ?
Thanks in advance
Best regards

I try what you say :
=== HTML ===
<applet codebase="." archive="Main.jar,Addon1.jar" code="Test.Appli.class" id="MyTest" width="600" height="30">
     <param name = "myPrm1" value = "1;2">
</applet>=== MAIN JAR ===
package retest;
interface InterfAddOn1 {
    public void AfficheTest1(String sStrTest);
public class Ctest {
    public Ctest() {}
    public void unTest(String sClassNameR) {
      String sClassName = "PackTestAddon.TestClass1";
      try {
          Object oObj = Class.forName(sClassName).newInstance();
          ((InterfAddOn1) oObj).AfficheTest1(" Hello World ");
      } catch (ClassNotFoundException ex1) {
          System.out.println("ERR Class not found");
      } catch (IllegalAccessException ex1) {
          System.out.println("ERR Illegal Access");
      } catch (InstantiationException ex1) {
          System.out.println("ERR Instantiation Exception");
}=== ADDON JAR ===
package PackTestAddon;
public interface InterfAddOn1 {
    public void AfficheTest1(String sStrTest);
package PackTestAddon;
public class TestClass1 implements InterfAddOn1 {
    public TestClass1() {}
    public void AfficheTest1(String sStrTest) {
      System.out.println("Test :"+sStrTest);
}I have this error :
Exception in thread "AWT-EventQueue-2" java.lang.ClassCastException: PackTestAddon.TestClass1
     at retest.Ctest.unTest(Ctest.java:58)
     at retest.Appli.actionPerformed(Appli.java:442)
     at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
     at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
     at java.awt.Component.processMouseEvent(Unknown Source)
     at javax.swing.JComponent.processMouseEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
I don't really know why ... =;o(
Helppppp ... Thanks in advance.

Loading multiple-package applet from JAR

Hi, apologies in advance if this has been dealt with in this forum already. I've got two questions:
Question one: I have written two packages, evolve and fences. I would like to run fences.Fences.class which is an applet. I went to my classpath directory and typed
jar cf mystuff.jar evolve fences
(each package lives in its own directory off the classpath.)
then made a web page that said
<html><body>
<applet code=fences.Fences.class archive=mystuff.jar>
</applet>
</body></html>
I then piped the HTML file and mystuff.jar up to a remote server to make sure I wasn't reading my local fences package, made them world readable, and tried to load the web page. On my local machine, a Linux box running Galeon 1.2.5 (Mozilla, basically), I could load the applet. On a separate box running IE 5 I got the error in the status bar "load: class fences.Fences not found" . I'm not sure how to open the Java console in IE so I can't give any more info than that.
I suspect that perhaps my local box is still somehow using my local classes or an old copy of the applet and is not loading from the archive, but I can't be sure.
Question two: Until stumbling upon the answer in this forum, I wasn't sure how to run an applet that used more than one user-created package. I see that I can package both into one archive; but I thought that I could also have separate .jar files for each package and then specify both in the "archive=" <applet> parameter. It didn't seem to work. Anybody know if there's a way to do this?
Thanks in advance for any help!

yes, i've seen that since i originally posted, tried it - didn't work. I've since tried another even simpler test, to try to isolate the problem. I wrote this code in a file called Tester.java:
import javax.swing.*;
class Tester extends JApplet {
public void init() {
getContentPane().add(new JButton("Hi"));
}I compiled this class and put it at http://www.cs.uga.edu/~gundlach/jartry/Tester.class . I then created a webpage in the jartry/ directly that says:
<html><body>
<applet code=Tester.class width=55 height=68></applet>
</body></html>
Then, using Mozilla to go to http://www.cs.uga.edu/~gundlach/jartry/test.html , I get the applet with the single button. When I open it in IE 5, it says "load class Tester not found" when I mouseover the applet.
What the heck am I doing wrong?
Thanks
Michael

Including multiple jar files to applet

In one of my application I am using severla third party apis (JavaHelp, JFreeReport, NanoXml ...) which comes as a seperate jar file each.
Is there is a way that I can include these multiple jar files to be downloaded automaticaly when the applet is starting.
currently I am extracting all the jar files and then re compressing them in to one file and place it in the archive property in the applet tab.
Is there a way I can avoid extraction and recompression and directly use the jar files

<param nama="archive" value="myjar.jar, myOtherjar.jar" />
You could try to create an installer that wil put the 3rd party jars in the users lib/ext directory.

Multiple signed applets

Hello,
I'm having trouble trying to get my signed applet to work. Here's my situation:
I've created a signed .jar file that relies on classes in another .jar file. The second .jar file comes from a 3rd party and is signed by them. I'm using IE. When trying to access the applet, I get a security dialogue box that prompts me if I want to trust the signed applet signed by me. I click yes and get an error in the java console window
java.lang.NoClassDefFoundError: netscape/security/AppletSecurityException
at java.lang.Class.forName0(Native Method)
I'm assuming this is because of the 3rd pary .jar file I'm trying to use. I was not prompted to trust this .jar file. Should I have been? i have listed this other .jar file in the html file as one of the archives. Should I be using .cab files instead? What is the proper way to construct the html file when using multiple signed .jar files (signed by different parties) in conjunction with IE?
I've gotten another simple signed applet in the form of a .jar file to work with IE just fine. But, it didn't rely on a signed 3rd part .jar file.
Any help is greatly appreciated.
thanks!
-jeff

The ClassNotFoundException for Netscape should be handled in a catch block when running in IE's native JVM. This is a bug in the code.
You can run multiple signed applets in IE. There's no special HTML syntax to do so, just multiple applet tags. Generally, it will prompt you to accept permissions for each signed codebase.
Eimhin

ClassNotFoundException: Jar - Applet - WebServer ?

I'm running an applet (IE 5.0 whith plug-in) from a web server (MIIS). The applet uses some other classes. If I put the html page, the applet and the other classes in the same directory, everything works fine.
If, instead of it, I put in that directory the html page, the applet (*.class) and a jar file containing the classes the applet need, I get the ClassNotFoundException. What is wrong with this?
Can anybody help? I have read a lot of messages from this forum, looking for a similar problem, but nobody seems to have it.
Thank you in advance.
[email protected]

Placing your class files in a jar is nice for speeding up the download process, but you don't necessarily have to have them in the same jar. You have a couple of options at your disposal.
1. Use the html archive tag to specify multiple jars. There is nothing wrong with the specifing multiple jars in the archive value - just seperate them with commas.
ex. archive="one.jar, two.jar, images/three.jar"
2. Use the download extension mechanism. Place your classes in a jar, and create a custom manifest for that jar specifing a Class-Path attribute that refers to another (or multiple) jar file(s).
ex. Class-Path: one.jar, two.jar, images/three.jar
When specifing the additional files, in most cases use relative paths. When this is not possible, an absolute URL may also be used (but with some care - it's not obvious in some cases).
Be warned though, that trying to traverse up a directory tree (by using "..") can lead to a security exception in some browsers, so try to plan ahead and not do this.
Hope this helps,
-Ron

What could be causing my multiple response survey question to show a non-response in LMS report?

I have a 10 question survey that has been running fine and providing accurate responses in reports generated from my LMS. I made a property change to a multiple response type question that is now causing the reports to show a date/time (2003-01-01 18:00:00) response instead of the actual multiple responses the user made. The change I made to the question was to change the "Numbers property from" [ a), b), c) ] to [ 1), 2), 3) ]. This property change did not affect the reported responses for the single response questions, only the multi-response. This problem occured Using Captivate 4. I then tried using the same properties in Captivate 5.5 thinking it was a bug in CP4, but got the same results. Has anyone else run into this issue? I'm going to bring this to the attention of my LMS provider, but want to make sure CP is clean first.
Thanks,
Dave

First things first. I am not an LMS expert, so this is not about troubleshooting.
However, to ensure that your course works fine on a SCORM-compliant LMS, you can upload it to cloud.scorm.com and test it out. If the course works fine there, rest assured that it will work fine on any SCORM-compliant LMS. If your LMS team comes back with an issue after this, you can counter them with this evidence that the problem is with the LMS and not your course.
Sreekanth

Problems during execution of signed JARs applet...

Hi Everyone,
I noticed that AppletViewer used for development allows a wider range of operation not permitted during the execution in browser of a signed JAR.
I would be interested to know if this is caused because I am using a not real certificate (generated for testing). Anyone with a real certificate may tell me if for example URLClassLoader works well with jar applet signed with his real certificate?
Thanks, bye

Thanks, you confirm what I was not anymore able to verify in my browser :)
In fact the very first time I launched my applet in browser, the browser was showing a detailed message dialog pane complaining the untrustable certificate and restricted access privileges, so I thought to accept untrusted certificate as default and I tried to set up some options in security panel of the browser to trust untrusted certificate. Consequentely I was receiving only the untrusted certificate warning without any restriction message warning.
I understood that applets signed with untrusted certificates gives some more privilege than applet not signed, but evidently the security level of untrusted certificate does not give all total priviliges that trusted certificate does.

Partial-credit scoring in multiple response and multiple hot-spot questions

Hello everyone,
I'm calling on your generosity in the spirit of the holidays to help out a noob. I would like to create matching, multiple-response and multiple-hot spot questions where the user receives credit based on the number of correct answers within the question. For example, in a matching question where there are four items; if the user gets 2 out of the four items matched correctly, I would like for him to receive 2 out of 4 points.
I understand that Captivate doesn't support partial-credit scoring of this type, but a few posts have implied that it can be done with variables. Is there anyone who can walk me through this process, or send me to a link that will walk me through it? (I've scoured these forums and tried the Cp tutorials, to no avail.) And if it's not asking too much, please make it understandable to someone who has very little experience with variables.
Thanks, and Merry Christmas.
JR
(Running CP 5 on Windows Vista)

Hello,
I did publish an article more specific on partial scoring, perhaps this could help you:
Partial scores and customized feedback
And since you are asking for more basic information, on my blog I point to some other articles to explain the meaning of variables with/without advanced actions. Feel free to have a look (there are more postings about advanced actions and links to articles over there):
Curious about variables ?
Unleash the power of variables with advanced actions
Lilybiri

Split applet in multiple jars downloadable on demand

What I'm trying to do is fairly simple, usual and a widespread practice in Flash/Flex/Silverlight. I need to split an applet in multiple modules, then download only the modules the users explicitly requests, and provide a preloader for each download. I think the best way to do this is to pack each module inside separate jar file, then download the jars I need on demand.
But I'm lost. Does the JarURLConnection class provides a way to monitor the download progress of the jar? If not, then I have to use HttpURLConnection? Plus what? A little help please.

Please refrain from [multi-posting|http://forums.sun.com/thread.jspa?threadID=5392215].
A better way to achieve this application feature is to launch this applet using Webstart, and specify the other archives as 'lazy' download, then take active control of the downloads using the JNLP API's [DownloadService/Listener|http://pscode.org/jws/api.html#ds] to fetch the Jar's.
This would mean the applet becomes free-floating (not embedded in the browser), unless the client has 1.6.0_10 or above, which then enables embedding Webstart based applets in a browser window.
As an alternative to that - you might also 'roll your own' variant using URLConnection (or whatever) and wrapping the InputStream in a ProgressMonitorInputStream. But I cannot see that being made workable, short of a digitally signed (and trusted) applet, which seems like overkill for a simple 'quick on-screen, then progress monitor while rest of resources download' type scenario.

Multiple jars with applet

I have an applet that requires jmf.jar, however this jar file may not be on the client site. I have done some looking but am unable to come up with a solution that allows me to sucessfully send this jar along with the jar containing the applet code to the client site. Any help will be greatly apreciated., especially if you have a "working" solution and not just a documentation reference.
Robert
[email protected]

I suggest you look at the "GenJar" project on sourceforge. This will allow you to selectively assemble a combined jar file using just those classes that you need to run the program.
Alternatively you could try copying jmf.jar into your code directory, alongside your applet jar and putting a
Class-Path: jmf.jar
row into the manifest in your main jar file. I haven't tried that with an applet (I prefer GenJar) but in theory it ought to work.

Multiple jar files from different locations

Hello,
I am having an applet that access code from two different jar files. Of them one is a common jar file for many applets. So I couldn't place it in the local dir as that of the applet's html. I am not using any web server.
     Just to give you a feel of it :
     <PARAM NAME = archive VALUE = "DVApplet.jar,DVVP.jar" > are the jar files my applet is dependant on. But DVVP.jar has to be accessed from a dir different from local dir.
     Will be glad if someone can throw some light on accessing different jar files from different dirs.
     Thanks for your time.
Regards,
Anantha

[url=
http://forum.java.sun.com/thread.jsp?forum=421&thread=425724&tstart=0&trange=100
]This question is a bit similar
You can use a class loader to do such things.

How to use SSLSocket on a signed jar applet?

Hello:
OK, I finally could make work my client-server project, not the way I 'd like, but it works.
Now the problem is this:
Currently I have my applet in a jar file; saiCte.jar, which is signed in this way:
keytool -genkey -keystore TECSSDStore.keystore -alias Key1 -keyalg RSA -storepass tttttt -keypass tttttt
jarsigner -keystore TECSSDStore.keystore -signedjar saiCte.jar temp.jar Key1 -storepass tttttt -keypass tttttt
But signature is not useful for appletviewer, in my browser, I supposed that a signed applet would work, but it doesn't. There is a handshake problem. In the server it is:
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
I have to run the applet this way:
java -Djavax.net.ssl.trustStore=TECSSDStore.keystore -Djavax.net.ssl.keyStorePassword=tttttt -Djava.security.policy=SecPolicy sun.applet.Main Cte.html
Cte.html is this:
<applet    code = 'saiCte.class' archive='saiCte.jar' width='750' height='480'> </applet>So how could I make my signed jar work in the browser? I considered setting properties, but it worked, I would reveal my password. Currently the only way I know for distributing my applet is including the keystore and password, which is inadmissible, since I signed the jar (or why am I supposed to sign jars if anyway I have to send keystore and passwords?)
Thanks!

Questions:
1. Are you using client authentication in this SSL setup?
In the server I have this:
Socket.setWantClientAuth(false);
I guess if this option is false and the client chooses not to provide authentication information about itself, the negotiations will continue.
I read in SSLSocket API docs for setUseClientMode that "Servers normally authenticate themselves, and clients are not required to do so. "
2. What is in this keystore that you want to distribute?
In my keystore there is only what can be produced with this:
keytool -genkey -keystore TECSSDStore.keystore -alias Key1 -keyalg RSA -storepass tttttt -keypass tttttt
Now, I would have to distribute it if I want to run the applet from appletviewer:
java -Djavax.net.ssl.trustStore=TECSSDStore.keystore -Djavax.net.ssl.keyStorePassword=tttttt -Djava.security.policy=SecPolicy sun.applet.Main Cte.html
Which is the key of my problem: I do have a certificate, so I should not need to send the keystore and I should be able to run the applet from the browser. Actually it does run, the problem is in the connection:
In the client: (from firefox's Java console:)
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
     at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(Unknown Source)
     at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
     at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
     at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(Unknown Source)
     at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(Unknown Source)
     at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Unknown Source)
     at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Unknown Source)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(Unknown Source)
     at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
     at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
     at java.io.DataInputStream.readInt(Unknown Source)
     at r.a(Unknown Source)
     at X.actionPerformed(Unknown Source)
     at java.awt.Button.processActionEvent(Unknown Source)
     at java.awt.Button.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
     at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
     at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
     at sun.security.validator.Validator.validate(Unknown Source)
     at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(Unknown Source)
     at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
     at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
     ... 23 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
     at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
     at java.security.cert.CertPathBuilder.build(Unknown Source)
     ... 29 more
In the server:
javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.checkEOF(Unknown Source)
at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
at com.sun.net.ssl.internal.ssl.AppInputStream.read(Unknown Source)
at java.io.FilterInputStream.read(Unknown Source)
at Tipos.TString.Read(TString.java:62)
at saiSrv$ConsultaServidor.run(saiSrv.java:1045)
Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.recvAlert(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write(Unknown Source)
at com.sun.net.ssl.internal.ssl.AppOutputStream.write(Unknown Source)
at java.io.DataOutputStream.writeInt(Unknown Source)
at saiSrv$ConsultaServidor.<init>(saiSrv.java:1030)
at saiSrv.<init>(saiSrv.java:970)
at saiSrv.main(saiSrv.java:993)
OK, thanks for the help, it's midnight in America, (you are in australia aren't you) so I'm going to the bed, can we continue chatting tomorrow?

Combine multiple jars into one product jar

Hi everybody,
I use multiple third party jar APIs in my applet project. When I built the project, I get one product jar and the other jars in LIB folder. I am wanna produce only one jar including other jars inside. I use netbeans.
Shortly How can I combine all jars into one jar ?
Thanks...

woaw, Got it: http://www.oracle.com/technetwork/articles/javase/single-jar-141905.html
Other jars were signed jars in project. Now, I got only only one jar and unsigned.
If I sign this unique jar, will I see a problem ?

Multiple Headphone outs question

Hi there,
I recently asked for a bit of help getting my home studio setup sorted and I just need a bit more advice please!
While I'm experienced in the live room of a studio, I'm still very much an amateur on the other side of the glass! Basically I'm just putting together a basic setup to track some demo's / ideas with my band. So far, I've got a Motu 8PRE interface running the drum and instrument mics into Logic and the outs from the 8PRE going to the monitors. My question is this...
How do I set up multiple headphone outputs with independent mixes so band members can have a custom mix in their headphones? I'm having a hard time figuring out how this would work and have no idea what I need to do in Logic to set it up, and also what hardware I might need.
If anyone could explain this, both how to set it up in Logic and the kind of hardware I would need that would be fantastic!
Many thanks in advance

1) Yes
2) Sorry - I assumed that box had 8 outs too - I assumed wrong. You could get an additional multi-channel interface which accepts ADAT inputs as well as analog, which would give you great flexibility. MOTU makes several - better yet check out RME, Focusrite, and others. There are dozens on the market - it depends on your budget and future expansion plans.
3) Yes, or a headphone distribution system - but again, your budget will determine this. Hear, Furman and Aviom all have systems. Or for much less, Presonus headphone amps. Depending on your physical set up, you might need a snake unless you're using an already wired recording room.
Good luck.

Multiple-jar applet question

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