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Index › Programming Questions & Help › Other Libraries › ControlP5: Error in an applet
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ControlP5: Error in an applet (Read 1208 times)
javier.arantegui
ControlP5: Error in an applet
Jan 17th, 2008, 6:36pm  
Hi,

I have programmed an sketch to draw a mathematical function. There are two parametres of the function that can be changed using two sliders. The sliders are done using ControlP5. The sketch works OK when I run it from the Processing IDE.

The problem is when I export it as an applet and I run it inside the browser. In that case I get the following error in the Java console:

ControlP5 0.2.7 infos, comments, questions at http://www.sojamo.de/controlP5
### WARNING @ ControlP5.invokeField java.lang.IllegalAccessException: Class controlP5.ControlBroadcaster can not access a member of class _2o_Orden with modifiers ""
### WARNING @ ControlP5.invokeField java.lang.IllegalAccessException: Class controlP5.ControlBroadcaster can not access a member of class _2o_Orden with modifiers ""
### WARNING @ ControlP5.invokeField java.lang.IllegalAccessException: Class controlP5.ControlBroadcaster can not access a member of class _2o_Orden with modifiers ""
.. etc etc etc

The generated jar works fine when I run it using:

java -jar _2o_Orden.jar

The applet is available here:

http://web.udl.es/usuaris/w3511782/applet/

and the jar file:

http://web.udl.es/usuaris/w3511782/applet/_2o_Orden.jar

My operating system is a Kubuntu 7.10. Processing is 0135BETA and ControlP5 is 0.2.7.

There is a little more information in this thread:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Programs;action=display;num=1200411214

Javier
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sojamo
Re: ControlP5: Error in an applet
Reply #1 - Jan 18th, 2008, 5:29am  
hi javier,
the error you are getting is due to the security handling in applets. the solution here would be to make your variables z and tao public.
Code:

public float z=.5;   // Coeficiente de amortiguamiento
public float tao=.5;  // Constante de tiempo


by doing so, controP5 is granted to have access to these variables. you are not getting these errors when not running in a browser since the security handling is less strict in this case.
best,
andi
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andreas schlegel / http://www.sojamo.de
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javier.arantegui
Re: ControlP5: Error in an applet
Reply #2 - Jan 18th, 2008, 12:10pm  
Hi,

Thank you. Obviously that solved the problem.

May I suggest you to include that information in the ControlP5 website? Probably it is well known for more experienced Processing programmers but I think that i would be a good piece of advise for novices, like me.

Javier
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sojamo
Re: ControlP5: Error in an applet
Reply #3 - Jan 18th, 2008, 3:36pm  
thanks javier for the hint, updated the website.
andi
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andreas schlegel / http://www.sojamo.de
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javier.arantegui
Re: ControlP5: Error in an applet
Reply #4 - Jan 18th, 2008, 11:34pm  
Great!

Javier
PS. It's a pity I don't know more English. I haven't got enough vocabulary to express how much I hate the blink tag Wink
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