Experimental Physics and
Industrial Control System

Thomas Pelaia II <[email protected]> · Mon, 25 Sep 2006 15:24:08 -0400

Chris,
Our experience with CAJ is mixed. JCA/CAJ offers significant
benefits over JCA/JNI, but it has its own bugs.
JCA/CAJ advantages over JCA/JNI:

- No native binaries are needed

- runs everywhere Java is installed

- easy deployment via Java Web Start

- Cosylab now has a pure Java implementation of the CA Repeater

- CAJ monitors are up to five times faster than JCA/JNI monitors

- no memory leak (JCA/JNI has an effective memory leak that
eventually causes applications to crash on an out of memory error)
JCA/CAJ issues:

- security issues as Kay noted

- when monitoring a large number of channels (I believe about 1,500
channels or so), you cannot connect to new channels (or reconnect old
ones) after some time since the first monitors where created (it
seems that connection events aren't being processed when several
monitors are running)
We are currently providing feedback to Cosylab to resolve the issues.
-tom

On Sep 25, 2006, at 1:43 PM, Christopher Larrieu wrote:
Does anyone have experience using Cosylab's java channel access
(CAJ) in a

real-world, production system? I'm curious about using it in lieu
of JCA.
Thanks,
Chris
--
Christopher Larrieu
Computer Scientist
Stanford Linear Accelerator

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System