[Zope3-dev] Re: Java applets and zope3

[Tres Seaver]

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Christian Theune wrote:
> Hi,
> 
> Paul Carduner wrote:
>> <h3>Fractals</h3>
>> <applet code="/Programs/Fractals/Attractor.class" height=100 width=600></applet>
>>
>> On the static site, this html loads the java applet perfectly.  On the
>> zope3 site however the browser recognizes the java applet, but it
>> fails to load.  Opening up the java console, I get the following error
>> message(s):
>>
>> load: class http://www.carduner.net/Programs/Fractals/Attractor.class not found.
>> java.lang.ClassNotFoundException:
>> http:..www.carduner.net.Programs.Fractals.Attractor.class
>> 	at sun.applet.AppletClassLoader.findClass(Unknown Source)
>> 	at java.lang.ClassLoader.loadClass(Unknown Source)
>> 	at sun.applet.AppletClassLoader.loadClass(Unknown Source)
>> 	at java.lang.ClassLoader.loadClass(Unknown Source)
>> 	at sun.applet.AppletClassLoader.loadCode(Unknown Source)
>> 	at sun.applet.AppletPanel.createApplet(Unknown Source)
>> 	at sun.plugin.AppletViewer.createApplet(Unknown Source)
>> 	at sun.applet.AppletPanel.runLoader(Unknown Source)
>> 	at sun.applet.AppletPanel.run(Unknown Source)
>> 	at java.lang.Thread.run(Unknown Source)
>> Caused by: java.io.IOException: open HTTP connection failed.
>> 	at sun.applet.AppletClassLoader.getBytes(Unknown Source)
>> 	at sun.applet.AppletClassLoader.access$100(Unknown Source)
>> 	at sun.applet.AppletClassLoader$1.run(Unknown Source)
>> 	at java.security.AccessController.doPrivileged(Native Method)
>> 	... 10 more
>>
>> Of course, the url that "failed to load" seems to work fine when I
>> type it into the browser because the file is obviously there.  Does
>> anyone know why this might not be working?  Google searches have
>> turned up nothing for me :/.
> 
> I don't know Java and applets very well, here are some standard thoughts:
> 
> - Does the .class file require a certain MIME type to be shown when it
> gets downloaded?
> - Does this work (with the HTML) when you put it on a static web server
> (is that what you mean by static site? or did you mean it works on your
> local machine using file:// urls?)
> 
> Zope in general doesn't do very much that would disable applets and friends.

Another possiblitiy would be Zope's messing with the <base> tag;  that
should only affect "relative" URLs, however.


Tres.
- --
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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