On 06/23, 梁雅翔 wrote:
> Hi all,
> I met some question when I install the channel archiver.
> I should install the caj first as the web said: http://slacmshankar.github.io/epicsarchiver_docs/details.html.
Hmm, I see no reference to JCA on that page. And I see only one
reference to CAJ where it says that the EPICS archiver appliance
includes a bundled version. But maybe someone has just recently edited
that page so it's no longer as it appeared for you?
> The Download lind was broken, the Sourceforge link took me to "Java Channel Access", does JCA was CAJ ?
> then when I try to install JCA (Java Channel Access), I met the question.
> my jca was put in /base/extension/src and jdk was installed.
> Feora 23, linux86_64, base 188.8.131.52
That version of EPICS Base does not exist.
Basically, the JCA/CAJ experience for a developer is quite poor.
The download links at the JCA and CAJ websites  are both broken.
And if I search on the Maven Central Repository  for caj, I find
two artifacts with that ID under two group IDs: com.netopyr.caj and
org.epics. I don't know anything about the first, and the second, taken
as a reverse domain name takes me to <http://epics.org/> which says the
Opinions expressed on this personal web site are my own only and
do not reflect those of any institutions or organizations. It is
hosted by a private service provider and paid for entirely by myself.
As always, I invite your feedback and value your suggestions and
Thanks, Bill Rawnsley
That's not very reassuring for someone trying to confirm the
authenticity of the artifact.
Then searching Google for "maven org.epics" (without the double-quotes)
finds some hits in pom.xml files under <https://github.com/epics-base>.
Looking at those shows me that some official EPICS modules are using the
jca and caj artifacts under the org.epics group ID, and so I conclude
they are probably the ones I want.
The jca and caj artifacts are signed (by an entity known as "Epics
Jenkins <firstname.lastname@example.org>" with key fingerprint 7A43 0EA3 F855
AF1A 0257 67EC 95BF A9B8 77E6 0641), so that would seem an obvious way
to verifying their authenticity. Unfortunately, I don't know of any
information anywhere about who signs the artifacts and who else has
signed the key used to sign the artifacts. I have no way to establish a
Lastly, looking at the CAJ website under Changes shows that the last
released version was 1.1.15 on 2015-03-25. There's also a listing for
version 1.1.16 with a release date of "2015-xx-xx" [sic]. Looking at
the source code repository referenced on the CAJ website, there have
been 5 commits on the default branch since the 1.1.15 release, the last
commit occurring on 2015-06-29. Why is there no release that includes
the commits that fixed bugs? Have there really been no commits in
almost 2 years?
I'm hoping all of this improves with a move to GitHub and new
maintainership mentioned in  (although I know nothing about what's
To answer your question, to get JCA and CAJ, you should just use an
existing JAR from the Maven Central Repository ; you don't need to
compile the JARs from source. You can just search for:
g:"org.epics" AND a:"jca"
g:"org.epics" AND a:"caj"
Use the "jar" download link for each.
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