NoClassDefinitionFoundException when using additional libraries

I run an applet that has it's classes packaged in a jar file. Since I use additional libraries, that I added to this jar file, running the applet causes a NoClassDefinitionFoundException. The applet can't find the libraries it needs. I created the jar with eclipse's "export as jar", my eclipse-project has the additional libraries in it's build path as external jars. Why can't the applet find them though they are in the archive-jar-file? Where do I have to put them or what do I have to do to make the applet find them?

If you're doing stuff with applets then I think all the classes have to be packaged in the same jar. A jar inside a jar might work, but I haven't tried it.

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    This system with Photoshop CS5, freezes up faster then the CS4 system.
    When I say Freezes up what I am referring to is the mouse and keyboard will not respond. Control/alt/delete will not bring up the task manager. Eventually I give up and have to force a shut down by pushing and holding the case start button for about 5 to 8 seconds.
    when I restart the system I check the file that I have been working and several times the file that I was working on is corrupted beyond Photoshops ability to open.
    I have used the windows 7, on board, memory diagnostics and it claims that all of the memory is fine I have reviewed the event logs and the only critacal errors are about the system being improperly shuting down. I even went to the trouble to click on the link for each error that will take you to Microsofts website and will serch for anything they have about that event and they had no help on the event.
    People with mac computers have had a similar problem that had to do with there fonts and plugins, but I do not have a mac and I have not installed any plugins. The CS5 is as it came from the factory and the Mac people kicked me out telling me to get over on my side of the street where the rest of the windows outcast are but that was only after they thought they had there problen solved. Its so funny, but losing these files is not, Please Help

    Thanks everyone for jumping in with both feet.
    Let me review what I have already done.
    (1). I have already witnessed how the wround driver for the tablet will wrack havoc. when I first started the 64 bit version of CS5 it would not recognize any PSD files at all and if you went to the file and right clicked looking for the (open with) dialog box forget-about-it the option for Photoshop was not an option.
    I called Adobe tech support and they told me that I was not going to be able to use the Wacom tablet with the 64 bit versionof Photoshop. I found that a little suspicious seeing how Wacom tablets  are the most preferred pen tablets for professional illustrators.
    I contacted Wacom and they explained that I needed to uninstall the Wacom tablet, reboot the computer, go to the website, download the new 64 bit drivers and then reinstall the tablet. after I did that. Photoshop found all of my files and opened just fine.It was only then that I found out about the freezing proplem with the 64 Bit version.
    A number of the helpful people here have tried to advise this to me but I have already be down tha road.
    (2). I have the latest drivers for the BFG Nvidia Geforce 9600 Gt, released in April of this year and I had already new that the were necessary for the open GL so this is one of the first things that I tried.
    Some one from our cousin Mac's side of the famaly and (Noel just suggested) that I try turning off the open GL. As soon as cousin Mac asked us to try this I did it (Them being famaly and all).
    I was able to give it a try on the 32 bit system on Thursday 7/8/2010.
    I was able to work on a very large file with a multitude of layers, channels and paths for about 5 hours before if froze. after the reboot I found that the file was fine and retained everything up to my last save.
    But this test is only good as circumstantial evidence because the freezes are somwhat random. They mosly happen after I have been working with a large file for quite some time but some times it can happen very quickly, maybe 25 or 30 minutes.
    Bye the way I really enjoy the humor, the Mac people are very serious people.
    the Mac users are just grouchy because they expect their computers to "just work", and of course they don't.
    We PC users have been given no such expecatations. THANKS NOEL
    Oh, don't worry about them mean old grumpy PC wanna be Mac peoples. Gota luv it THANKS dec9
    and Eight thousand dollar papper weight says it all. THANKS $8000paperweight.
    (3) the memory, CPU and mother board can not be ruled out  completly, just yet
    As for the memory I have used the on board windows 7 diagnostics and it passed. but this is a unreliable test for hevy-resource dependent applications and a load or stress test would need to be done to be confidend.
    I have a number of computers with the same kind of ram but after swaping them around I can not say that I have had any lasting results and it is compecated by experiences like what happened to me after turning off the open GL. What if I had of only worked for 4 hours? I would of thought that the problem was solved thats what would of happened
    Do any of you work with files like I have been talking about? and if so do you experience any problems?
    The motherboard can not be rulled out by any tests that I know of other then process of elimination which is at the heart of all sound diagnostics.
    I downloaded a utility that is helpful called (Cupid Z) that gives real time monitoring and idenification of components.All the voltages seem fine.A.
    I hope I will be able to up load the screen shots so you all can have a look see.
    The CPH is more than likely not the problem.
    I do have the option to install Photoshop on a third computer that has most of the same components but has a different Intel CPU. this would rull out any compatability issues (CPU with the Board) but if that were the case I dought that every other progrem under the sun works fine except Photoshop.
    dec9, I did delete the prefs on the 32bit system but I have not had time to test the operation of Photoshop as of yet.
    Lastly I will try to upload the screen shots of (Cupid Z) you will see that the latencys and the frequency are correct. Under the SPDscreen the plausible timinigs for verious common frequencies are given,, all seem to be with in range. The lantency are inside the spec.given by Corsair;s website
    Asus provides a utility that allows you to monitor Temptures and voltages and I hope to send you a screen shot of this and you can see that they all are correct.
    I would like to send the event log but I am not sure how to do that if someone could give me the 411 on how to do this I will send them to you I have saved the errors in several file formats but I cant see how you cold read them on this little page Thanks again POBOX119 signing off

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