Java Classes from Ruby w/ C libs

Ruby JRuby
1

Hi,

Im new to Ruby and JRuby, but had a question:

I am currently trying to generate Java classes from RFuzz’s random.rb.
The
problem ( i believe) is that it random.rb uses a method contained in a c
library. I can generate the class successfully, but it throws errors
when I
try to use it. Here are some snippets:

There are the requires as in the .rb file.

Implements the randomness engine for RFuzz

This is the error I get when I try to use the generated Java class
(FuzzEngine is the class I am calling the generated class from):

at engine.FuzzEngine.main(FuzzEngine.java:7)

All that is included within the source of random.rb is a fuzzrnd.c, and
fuzzrnd.so file. There is also a ruby file called ext_help.rb.

I have tried renaming, and moving the .c, and .so class into my eclipse
project, etc. nothing.

any help? I imagine its an issue with trying to integrate the c library
(which contains a function that random.rb calls).

thanks!

2

AFAIK, JRuby doesn’t support native library © extensions, so you won’t
be able to use it right now. Some work is being done in this direction,
but hasn’t (?) been released yet.

On Wed, 2010-07-21 at 16:03 -0600, Skyler Onken wrote:

              class RandomGenerator
            at (unknown).new(random.rb:3)

any help? I imagine its an issue with trying to integrate the c
library (which contains a function that random.rb calls).

thanks!

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3

The C extension support work is being done in the cext branch at
jruby.org. I’ll add the gem to my list and see if I can get it to run.
-Tim

On Jul 22, 2010, at 11:39 AM, Nick G. wrote:

Im new to Ruby and JRuby, but had a question:

This is the error I get when I try to use the generated Java class

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4

Cool. Can this be made available to me? or perhaps the instructions to
fix
the issue? thanks!

5

This is all experimental stuff and right it’s only available if you
install from the branch yourself.
Sorry, but this will take some time to get into JRuby proper.

-Tim

On Jul 22, 2010, at 4:37 PM, Skyler Onken wrote:

On Jul 22, 2010, at 11:39 AM, Nick G. wrote:

library (which contains a function that random.rb calls).

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6

After a tiny bit of tinkering, the RFuzz gem compiles and the specs pass
on JRuby cext.

On Jul 22, 2010, at 12:26 PM, Tim F. wrote:

errors when I try to use it. Here are some snippets:

          such file to load -- fuzzrnd

eclipse project, etc. nothing.

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7

Where is the branch located?
Sent from my BlackBerry® wireless handheld

8

Nick G. wrote:

AFAIK, JRuby doesn’t support native library © extensions, so you won’t
be able to use it right now. Some work is being done in this direction,
but hasn’t (?) been released yet.

you could try ffi

9

If you clone the jruby.org git repository, you’ll find a cext branch.
-Tim

On Jul 26, 2010, at 3:00 PM, [email protected] wrote:

Sorry, but this will take some time to get into JRuby proper.

On Jul 22, 2010, at 12:26 PM, Tim F. wrote:

in a c library. I can generate the class successfully, but it throws
require ‘java’
Caused by: org.jruby.exceptions.RaiseException: no
I have tried renaming, and moving the .c, and .so class into my

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