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Index › Programming Questions & Help › Programs › Applet Error
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Applet Error (Read 2762 times)
wilbot
Applet Error
Aug 30th, 2009, 4:51pm  
Hi all
I get the following error when i try to run my program as an applet

java.lang.NullPointerException
     at sun.plugin2.applet.Plugin2Manager.findAppletJDKLevel(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Exception: java.lang.NullPointerException


Can anyone help me understand what's going wrong?

Thanks!
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PhiLho 
Re: Applet Error
Reply #1 - Aug 31st, 2009, 2:18am  
No idea, but to get the ball rolling, you should indicate which system you have (Win/Mac/etc.), what browser you use, what Java version is installed on your system.
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wilbot
Re: Applet Error
Reply #2 - Aug 31st, 2009, 6:08pm  
Right, sorry...

I'm running JRE 6 and JDK 1.6.0_16 on Windows. The problematic app is a simple twitter search thingie that uses twitter4j (which, of course, has to be added to the sketch).

It runs fine through Processing but I can't get it to function as a browser applet in Chrome, IE or Firefox . Initially the java error message said that TwitterException.class was missing, so I created that file from TwitterException.java and dropped it into the requested directory. Perhaps there's something wrong with that .class file?

Any suggestions?

Thanks again.
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PhiLho 
Re: Applet Error
Reply #3 - Sep 1st, 2009, 1:39am  
A classical error when going from standalone application to applet is to forget to sign the jar, when the applet accesses external resources (files, other Web sites...).
If you did this step, I am not sure what to check.
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wilbot
Re: Applet Error
Reply #4 - Sep 3rd, 2009, 6:48pm  
Thanks PhiLho.
I didn't sign it. Should i simply use jarsigner.exe to sign it?
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PhiLho 
Re: Applet Error
Reply #5 - Sep 4th, 2009, 1:31am  
See How to sign an applet hack.
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wilbot
Re: Applet Error
Reply #6 - Sep 6th, 2009, 11:40am  
Victory! Thanks very much PhiLo  Smiley
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gazy
Re: Applet Error
Reply #7 - Sep 22nd, 2009, 7:52am  
same issue here but that didnt solve it, any ideas???
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