Access to lib inside .jar

I've a signed applet, with some extarnal libraries included in it.
It works ok, but on some computers, it fail, the reason is that one of the classes does not match the number and types of the parameters (java.lang.NoSuchMethodError), as far I know the reason is that the applet, is not using the library included inside the applet .jar, but an external class with the same name (a different version of the library I suppose), so I want to know if there is a way to FORCE that the class I want to use is the one inside the applet .jar file, and no another one?
Perhaps some kind of parameter in the html callint the applet? os some way to build the applet in a different way? (I'm using jBuilder 2006 by the way) altough for newer developed projects I've changed to NetBeans.
Best regards.

The library is i-text and it's not common deployed as far as I know, it's a library for create, work and sign PDFs.
Some users of my applet in the web page, use another local application to sign another types of PDFs and this application uses a previous version of the library, and this application install a copy of the i-text.jar in the java/jre/lib/ext so it has preference and not the one inside my jar.
As I've discover this I can make a workaround to this client, but the general question that arise to me is, if there is a way I can tell the applet "hey, ignore the class com.a.b.c.TheClass if it's found inside java/lib and USE the ONE INSIDE your jar", and I'm asking it in a general way, I think is an interesting question (at least for me).
Someone told me abour jar sealing in this post, I though it was the solution but I could't make it work so my question is if I'm doing something wrong (I've write how I've done it some post up this one), or if jar sealing is not the solution for this and if there is any way to make this, with an applet.
Best regards.

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Message was edited by:
peper

But can anyone tell me why my servlet can not access the
contents inside a jar file?? Any suggestions please?
Thanks.Without seeing your code, it is likely that you are trying to use file names (like /some/path/yourFileName.ext), not resource names (loadable from the class loader) like /yourFileName.ext.
Example:
Instead of:
FileInputStream stream = new FileInputStream("/some/path/yourFileName.ext");
do this:
InputStream stream = getClass().getResourceAsStream("/yourFileName.ext");
There are other API's which take either a string file name or a URL. You want to go the URL way, where the URL is taken from the classpath as:
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Ok, I am creating a project where I am using JMF to display several pre-created videos. The finished project is going to be placed on a cd and submitted in a contest. Because of this, I am compiling the finished project into an executable .jar file. From my previous experiences, I have found that accessing files inside a jar is much more complex than accessing just any old file. The only way I have found to successfully access files inside a jar is through InputStreams (opposed to URLs). This is where my issues begin.
I have been searching throughout the internet for the past 2 days trying to find any way to create a Player using a type of InputStream. This doesnt seem to be possible the way it is set up. My obsticle here seems to be getting the Manager to realize the File. Here is what I've tried and the errors I got:
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InputStream movie = getClass().getResourceAsStream("video1.mpeg");
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Creating MediaLocator to file location -- java.net.MalformedURLException: no protocol: video1.mpeg -- I assume that basically means I'm screwed.
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Edited by: Aussiemcgr on Jan 10, 2010 7:03 PM

And there arises the pain-in-the-ass that is not yet clear to me. For this particular thing, it needs to be an application, not an applet. Which means I have to make it an executable (alternative might be a .bat, havent played with those for anything other than scripts) instead of something embedded. For whatever reasons, this is the efficiency of the school system or whatever the hell it is.
The simple fact in all of this is that I have no information about the computer this is going to be ran on. Effectively, I am doing this all in the dark right now because I have been given NO guarantee that the computer(s) I attempt to run this on will even have the Java Virtual Environment on it. And, unfortunately, I have no way of finding any of this out because the Computer Program category of these things are not yet been taken seriously so preparation for judging is a last-minute thing.
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Step 1: my library java file MyClass.java
package test.test1;
public class MyClass {
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adding: test/test1/(in = 0) (out= 0)(stored 0%)
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adding: test/test1/MyClass.java(in = 230) (out= 140)(deflated 39%)
C:\jdk1.6\bin>Step3 : Double checking the created jar file content by listing its content
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META-INF/
META-INF/MANIFEST.MF
test/
test/test1/
test/test1/MyClass.class
test/test1/MyClass.java
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import javax.servlet.*;
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LibFolderTest.java:4: package test.test1 does not exist
import test.test1.*;
^
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symbol : class MyClass
location: class LibFolderTest
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LibFolderTest.java:11: cannot find symbol
symbol : class MyClass
location: class LibFolderTest
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---Sujoy

Classnotfoundexception eventhough the class is inside jar

Hi guys,
I encountered weird problem where sometimes it throws classnotfoundexception eventhough the class is inside jar. I terminate the program and start it again then it works fine. I compiled the jar using ant
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Cheers,
Mark
Edited by: kmthien on Aug 2, 2010 3:05 AM

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Access to lib inside .jar

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