How are Javabean classes loaded?

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2 total messages Started by Mervin Williams Wed, 29 May 2002 01:46

#48

Author: Mervin Williams
Date: Wed, 29 May 2002 01:46

9 lines
2685 bytes

How are the class files used by a client-side Javabean within a distributed
application loaded:

- If it is the first request of the class files by the client, are the class
files downloaded from the server?
- If this is a subsequent request, are the files downloaded again?
- If the class files have been modified on the server, how are they
refreshed at the client?
- Should I use the Java Plug-In to make this process work correctly?

Re: How are Javabean classes loaded?

#49

Author: Sergey V. Udaltsov
Date: Fri, 31 May 2002 12:54

21 lines
2869 bytes

> - If it is the first request of the class files by the client, are the
> class files downloaded from the server? 
If they are not in a jar - they are loaded once the app really needs the
class. If they are in a jar - at the start of the app (or when this jar
is requested by corresponding class loader).
>- If this is a subsequent
> request, are the files downloaded again? 
No. Unless you write special class loader (though not sure it will work).
- If the class files have been
> modified on the server, how are they refreshed at the client?
No. Unless you write special class loader (though I am not sure this
can help - probably JVM asks class loader only one).
> - Should I use the Java Plug-In to make this process work correctly?
I don't think there is a way to "update" classes on the fly while your
app is running. Incompatible class version can possibly break JVM IMHO.
 

-- 
Dr. Sergey V. Udaltsov
Brainbench MVP for Java 1
http://www.brainbench.com

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