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Getting non-Java resources from cache jars

Pete Ihlenfeldt
Greenhorn

Joined: Jan 24, 2008
Posts: 9
I don't completely understand the Dark Arts of how the plugin facilitates the connection between an applet and the jars in the plugin cache... making them part of the applet's classpath. But i do know that with all the auxiliary jars I have, the applet has been finding the classes it needs.

Now I have a rather large spreadsheet, that I wanted to deploy as an uncompressed jar, because it takes too long to stream it over the wire off the server. I wanted to avoid putting the spreadsheet in the applet jar itself. So, I did a jar cvf0, put the spreadsheet in there, included it in my project classpath (e.g. project properties -> compile -> libraries -> add new Jar).

Locally it works great.



works perfect.

For the applet, I added an entry in the <OBJECT> tag on the serving HTML page, and deployed. When I start the applet, the plugin retrieves the file perfectly, and I checked it in the cache... all good.

Problem: getSystemResourceAsStream returns null.

I am moderately experienced with the other Dark Arts of ClassLoaders, but does anyone see a glaring, obvious blunder I am committing?
[ January 29, 2008: Message edited by: Pete Ihlenfeldt ]
Pete Ihlenfeldt
Greenhorn

Joined: Jan 24, 2008
Posts: 9
The answer: for anyone who needs it:

I read some tech notes and found that the proper way to do this is NOT to use getSystemResourceAsStream. Rather you should use "getResource".

Obviously you would re-arrange this code with the proper try/catch/finally blocks, but the condensed form is:



hope this helps someone.
[ February 05, 2008: Message edited by: Pete Ihlenfeldt ]
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Getting non-Java resources from cache jars