Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Thu, 30 Jul 2009 19:51:28 -0500

Folks,

I have 2 questions about CAJ, the native Java Channel Access client implementation.

1)  It seems like it behaves differently on computers with multiple network interfaces from the C implementation.  On the C implementation by default the broadcast address of each the networks is used when searching for PVs.  On the CAJ implementation this does not seem to be the case.  It is not finding PVs on one of these networks with the default configuration, in my case on the 10.20.1.x subnet.  However,  if I set the following in my configuration file then it does work:

gov.aps.jca.Context.auto_addr_list= false
gov.aps.jca.Context.addr_list= 10.20.1.255

Is this an intended difference in behavior from the C implementation, and if so is it documented?

2) My second question relates to knowing how to create configuration lines such as those above in the JCALibrary.properties file.

The documentation links in the CAJ User Manual here:
http://caj.cosylab.com/manual.html

Include this one labelled "JCA tutorial on configuration":

http://www.aps.anl.gov/bcda/jca/jca/2.1.2/tutorial.html

But that tutorial only lists configuration lines like these:

gov.aps.jca.jni.JNIContext.addr_list= toto.uses.this.ca.server
gov.aps.jca.jni.JNIContext.auto_addr_list= false

These are for the JNI (e.g. C) implementation, not for the native Java implementation.

There is another link on the CAJ User Manual Page which is labelled as "CAJ configuration properties":
http://www.cosylab.com/jca/apidocs/gov/aps/jca/JCALibrary.html#CHANNEL_ACCESS_JAVA

But this link is broken, and just takes one to the Cosylab home page.

Is there documentation on the configuration file syntax for the native CAJ anywhere?

Thanks,
Mark

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System