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Index › Programming Questions & Help › Integration › Processing with external library + HTML
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Processing with external library + HTML (Read 1504 times)
marieidat
Processing with external library + HTML
Apr 28th, 2009, 12:12pm  
I have completed a project using processing and the Traer physics library. The executable versions work fine, however, when I try to run the exported html I get this error:

java.lang.NoClassDefFoundError: traer/physics/Particle
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.getDeclaredMethod(Unknown Source)
at java.awt.Component.isCoalesceEventsOverriden(Unknown Source)
at java.awt.Component.access$300(Unknown Source)
at java.awt.Component$3.run(Unknown Source)
at java.awt.Component$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Component.checkCoalescing(Unknown Source)
at java.awt.Component.(Unknown Source)
at java.awt.Container.(Unknown Source)
at java.awt.Panel.(Unknown Source)
at java.awt.Panel.(Unknown Source)
at java.applet.Applet.(Unknown Source)
at processing.core.PApplet.(PApplet.java:162)
at tadpoles.(tadpoles.java:19)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: traer.physics.Particle
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 25 more
Caused by: java.io.FileNotFoundException: C:\Users\Marie\Documents\Processing\tadpoles\applet\traer\physics\Particle.class
(The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.(Unknown Source)
at java.io.FileInputStream.(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 29 more
Exception: java.lang.NoClassDefFoundError: traer/physics/Particle

Error code is here too (incase the forum doesn't like it!) www.mariewilkins.co.uk/processing_error.html

I assume this means somehow I need to include the physics library files... but where and how

Thanks, Marie
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Leesy
Re: Processing with external library + HTML
Reply #1 - Apr 28th, 2009, 1:14pm  
Like you said, the problem is that the applet (I'm assuming you're running an applet as you said it was on a HTML page) cannot find the required libraries.  YOu've got two options I believe:

[list=1]
  • Create one "fat" jar file that is all your required libraries packed into one jar that you then deploy
  • Try using the archive tag in your HTML:
    Code:
    <applet code="MyClass.class" ARCHIVE="libraryone.jar, librarytwo.jar" width="400" height="500"></APPLET>


    • I've not touched applets for a long time though so I could be way off!
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    marieidat
    Re: Processing with external library + HTML
    Reply #2 - Apr 28th, 2009, 1:29pm      
    Thanks, Leesy! It works!
         <param name="archive" value="tadpoles.jar,core.jar,physics.jar" />
    ...solved all my problems!!
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