Re: CAJ usage

[Kay-Uwe Kasemir <kasemirk@ornl.gov>]

Hi:

You need jca, which gives you
a) The basic java API, a lot of interfaces, in a jca.jar file.
   That's what ant complains about with the missing gov.aps.jca.
b) A JNI implementation of those interfaces,
   using the CA client lib from EPICS base,
   in some *so or *dll file.

Just jca works fine, but the problem is that it depends on the
JNI implementation, i.e. binary, system-dependent code.
You need to build the JNI part of jca for Win32, Linux, Linux 64-bit,
OSX-on-ppc, OSX-on-intel, for every version of EPICS base that
you want to use.

CAJ provides a pure java implementation, so it replaces (b).
At the SNS, we had some problems with CAJ possibly causing
hangups of CA server threads on IOCs, but the current hope is
that that's been fixed as long as you use the latest jca/caj
and IOCs run R3.14.9.

-Kay


On May 8, 2007, at 15:04 , David Dudley wrote:

> I'm trying to configure and use the CAJ library, since I can't be sure
> what kind of machine the application will be used on.  It can  
> almost be
> guaranteed that whatever machine it is, it won't have EPICS on it, for
> sure.
>
> I downloaded caj-1.1.3-src and caj-1.1.3.tar, and am attempting to
> figure out how to use it.
>
> From the caj-1.1.3 source directory, I can't get ant to operate  
> without
> giving pages and pages of errors.  It looks for package 'gov.aps.jca',
> but shows that package does not exist.
>
> Still working on getting use to java, I've been a 'c' programmer for
> around 20 years or so.
> All I did was go go to the source directory and type 'ant'.  Was there
> something else I was supposed to do as well?
>
> David
>
> > > > "Matej Sekoranja" <matej.sekoranja@gmail.com> 11/26/2006 1:49 PM
> Hi,
>
> sorry for the late reply.
>
> > Is there any additional information on utilizing the Jca library
> other
> > than the Tutorial listed?  I'd like to use a 'monitor' function to
> display
> > changing data, but there isn't exactly any documentation on it.
>
>
> There is a series of  EPICS training material.
> Java and JCA can be found here:
> http://www.aps.anl.gov/aod/bcda/epicsgettingstarted/developtools/ 
> java.html
>
> See also CA client library tutorials.
>
> Any help would be appreciated.
>
>
> The best thing is to look at BasicExample source (found in the
> sources). I
> attach it anyway.
>
> Matej
> <David Dudley.vcf>