We have tried to break your comments down into individual Issues which you can follow on github (https://github.com/epics-base/jca/issues).
Maven central is the place from where you can directly download the jca/caj jars along with their sources and javadocs.
We shall be updating the links wherever present to point to the maven central location.
There will be a new release on the caj library before the fall epics meeting, which will have the recent bug fixes and upgrades.
From: email@example.com [mailto:firstname.lastname@example.org] On Behalf Of J. Lewis Muir
Sent: Monday, June 26, 2017 6:16 PM
To: 梁雅翔 <email@example.com>
Cc: tech-talk <firstname.lastname@example.org>
Subject: Re: jca question
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 220.127.116.11
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
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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 <email@example.com>" 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 trust path.
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 planned).
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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