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Index › Programming Questions & Help › Syntax Questions › Order of linked jars
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Order of linked jars? (Read 275 times)
Smartbottom
Order of linked jars?
Jan 19th, 2009, 8:22pm  
Hi there,

I'm running a larger Java app with a Processing front end.  Running the non-GUI component from within Eclipse or the command line with explicit jar linking (of several 3rd party libraries) works quite well, but when I run from within the Processing IDE with the jars in the /code folder, something goes awry.

More specifically, I'm trying to access the serial ports and using components of comm.jar, modified slightly from the one that ships with Java 1.6.  Although I get data quite nicely without the GUI, the comm ports appear to be inaccessible to me except through the built-in Processing library when I'm running from the Processing IDE.  

How can I fix this?  Can I manually override any of the native libraries in Processing?  Is there some explicit ordering of jars that I can apply to ensure my comm port stuff is linked preferentially?

Thanks,

Aaron Genest
Department of Computer Science
University of Saskatchewan
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PhiLho 
Re: Order of linked jars?
Reply #1 - Jan 19th, 2009, 10:07pm  
Mixing libraries with same classes but different versions is in general a bad idea... Unless you use some specific classloader or something (don't me ask how!)
I can be wrong but I think from from previous bad experience, that Java uses the first class it finds. At least when using java.ext.dirs. I don't know if classpath order is respected.

Anyway, the best way to deal with that is to remove the old library and use only the newest.
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Smartbottom
Re: Order of linked jars?
Reply #2 - Jan 19th, 2009, 10:27pm  
Thanks, I've done that, but it appears that the communication library in Processing is over-riding the Sun's java library of java.comm.*  

Has anyone else found this?
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PhiLho 
Re: Order of linked jars?
Reply #3 - Jan 19th, 2009, 10:49pm  
Ah. This kind of conflict...
Did you tried to use fully qualified names?
java.comm.SomeClass sc = new java.comm.SomeClass();
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