> Removing unused methods shouldn't be too difficult for an automated tool
> to do, assuming you're not using reflection. Removing unused classes
> is rather tougher, because it's really quite hard to tell if a class
> is unused. Just because you never explicitly instantiate a class does
> not mean that it doesn't get instantiated though something you do,
> or because of the settings of various system properties and whatnot.
>
> (For example, anybody who can set the system properties for a VM can
> make the JDBC code instantiate arbitrary JDBC drivers, and perhaps other
> things too, if you're malicious.)
>
> cjs
I think JODE advertised that it removed unused methods, but I wasn't able to
get it to work. Anybody with information on that....
Regarding system properties for a CLDC device, AFAIK, the CLDC api only offers
a 'getProperty()' and no setProperty, so we don't have to worry about other
i-applis messing anything up for us. (The scratchpad would make a viable
alternative, however) I got started on this because I was going to try to make
a full mini SAX implementation, but realized that since I couldn't use
setProperty(), I couldn't dynamically generate a Parser class via the
ParserFactory (which gets the property and creates the class for you). I then
started wondering if the compiler or something would link up only the classes
that I actually used in my project (since I wouldn't be able to use the
ParserFactory), or if I would have to do it manually. In the case of SAX, it
should be no problem to do it manually, but for a large 3rd party jar, you
could conceivably get lots of 'artifacts' weighing down your own jar
considerably.
The Dasho Optimizer looks great, but is a bit pricey for my budget. I've been
using 1stBarrier (http://www.jproof.com), which is primarily an obfuscator and
makes no mention of removing unused methods or classes. Anybody using an open
source/freeware/shareware app that can do this?
One further question. Does the manifest info (META-INF) in a jar file need to
be there in order for an i-appli to run? For my jars, it adds up to
300-400bytes, which is not insignificant. I'm in the US, so I can't test this
myself.
--Jason
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Received on Mon Sep 17 22:01:45 2001