Not working on my side:

mvn org.apache.maven.plugins:maven-dependency-plugin:2.8:get \
-Dartifact='io.apiman.plugins:apiman-plugins-circuit-breaker-policy:1.4.0.Final:war'
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:get (default-cli) @ standalone-pom ---
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/doxia/doxia-sink-api/1.0-alpha-10/doxia-sink-api-1.0-alpha-10.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/doxia/doxia-sink-api/1.0-alpha-10/doxia-sink-api-1.0-alpha-10.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/doxia/doxia/1.0-alpha-10/doxia-1.0-alpha-10.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/doxia/doxia/1.0-alpha-10/doxia-1.0-alpha-10.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-doxia-tools/1.0.2/maven-doxia-tools-1.0.2.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-doxia-tools/1.0.2/maven-doxia-tools-1.0.2.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.9/plexus-utils-3.0.9.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.9/plexus-utils-3.0.9.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.pom (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.jar
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.9/plexus-utils-3.0.9.jar
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.jar
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-doxia-tools/1.0.2/maven-doxia-tools-1.0.2.jar
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.jar
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.jar (0 B at 0 B/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.jar
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.jar (0 B at 0 B/s)
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.jar (0 B at 0 B/s)
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.jar (0 B at 0 B/s)
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-doxia-tools/1.0.2/maven-doxia-tools-1.0.2.jar (0 B at 0 B/s)
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.9/plexus-utils-3.0.9.jar (0 B at 0 B/s)
[INFO] Resolving io.apiman.plugins:apiman-plugins-circuit-breaker-policy:war:1.4.0.Final with transitive dependencies
Downloading from central: https://repo.maven.apache.org/maven2/io/apiman/plugins/apiman-plugins-circuit-breaker-policy/1.4.0.Final/apiman-plugins-circuit-breaker-policy-1.4.0.Final.pom
[WARNING] Missing POM for io.apiman.plugins:apiman-plugins-circuit-breaker-policy:war:1.4.0.Final
Downloading from central: https://repo.maven.apache.org/maven2/io/apiman/plugins/apiman-plugins-circuit-breaker-policy/1.4.0.Final/apiman-plugins-circuit-breaker-policy-1.4.0.Final.war
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.775 s
[INFO] Finished at: 2018-06-14T12:12:01+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-dependency-plugin:2.8:get (default-cli) on project standalone-pom: Couldn't download artifact: Missing:
[ERROR] ----------
[ERROR] 1) io.apiman.plugins:apiman-plugins-circuit-breaker-policy:war:1.4.0.Final
[ERROR]
[ERROR]   Try downloading the file manually from the project website.
[ERROR]
[ERROR]   Then, install it using the command:
[ERROR]       mvn install:install-file -DgroupId=io.apiman.plugins -DartifactId=apiman-plugins-circuit-breaker-policy -Dversion=1.4.0.Final -Dpackaging=war -Dfile=/path/to/file
[ERROR]
[ERROR]   Alternatively, if you host your own repository you can deploy the file there:
[ERROR]       mvn deploy:deploy-file -DgroupId=io.apiman.plugins -DartifactId=apiman-plugins-circuit-breaker-policy -Dversion=1.4.0.Final -Dpackaging=war -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]
[ERROR]
[ERROR]   Path to dependency:
[ERROR]    1) org.apache.maven.plugins:maven-downloader-plugin:jar:1.0
[ERROR]    2) io.apiman.plugins:apiman-plugins-circuit-breaker-policy:war:1.4.0.Final
[ERROR]
[ERROR] ----------
[ERROR] 1 required artifact is missing.
[ERROR]
[ERROR] for artifact:
[ERROR]   org.apache.maven.plugins:maven-downloader-plugin:jar:1.0
[ERROR]
[ERROR] from the specified remote repositories:
[ERROR]   central (https://repo.maven.apache.org/maven2, releases=true, snapshots=false)
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

On Thu, 14 Jun 2018 at 12:08 Marc Savy <marc.savy@redhat.com> wrote:
search.maven.org tends to lag by several hours in my experience.

Try this:

mvn org.apache.maven.plugins:maven-dependency-plugin:2.8:get
-Dartifact='io.apiman.plugins:apiman-plugins-circuit-breaker-policy:1.4.0.Final:war'

Any luck? Seems to work on my end, but stuff might still be replicating out.

On 14 June 2018 at 10:59, Donovan Muller <donovan.muller@gmail.com> wrote:
> Thanks Marc,
>
> Still waiting for the plugins to reflect it seems:
> https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22io.apiman.plugins%22
>
> Thanks
>
> On Thu, 14 Jun 2018 at 10:46 Marc Savy <marc.savy@redhat.com> wrote:
>>
>> Thanks for bringing this up, Donovan.
>>
>> As a quick update: it looks like something also went wrong during the
>> release scripts for apiman-plugins and some of the version
>> substitutions didn't happen properly (might be my fault, but I'm
>> really not sure -- it's likely a consequence of earlier failures due
>> to the OSSRH glitches interrupting things).
>>
>> I ended up having to do a force push on plugins to bring everything
>> back into sync, so many apologies to anyone who pulled from master in
>> the last 24h.
>>
>> Apiman plugins 1.4.0.Final release /should/ be available now -- I
>> received an error from OSSRH but it seems to have deployed anyway.
>>
>> Please try it out.
>>
>> Regards,
>> Marc
>>
>>
>>
>> On 14 June 2018 at 08:46, Marc Savy <marc.savy@redhat.com> wrote:
>> > Hi,
>> >
>> > It /should/ be there now. It seems to have hit a technical glitch of
>> > some sort. I'll try again right now.
>> >
>> > There were some technical problems with Sonatype's OSSRH which meant
>> > it took 2 days to get the release out (see:
>> > https://issues.sonatype.org/browse/OSSRH-40470 and thread
>> > https://twitter.com/marcsavy/status/1006606526050598912).
>> >
>> > On 14 June 2018 at 07:33, Donovan Muller <donovan.muller@gmail.com>
>> > wrote:
>> >> Hi,
>> >>
>> >> Thanks for the release!
>> >> When will the 1.4.0 release plugins be published to Maven central (or
>> >> perhaps another download site)?
>> >>
>> >> Thanks
>> >>
>> >> On Wed, 13 Jun 2018 at 17:04 Marc Savy <marc.savy@redhat.com> wrote:
>> >>>
>> >>> Very happy to say that 1.4.0.Final has been released.
>> >>>
>> >>> Please try it out and give feedback.
>> >>>
>> >>> The major outward facing changes are:
>> >>>    - Upgrade Elasticsearch support to 5.x (from 1.x).
>> >>>    - Allow policies to suppress and allow connector headers via policy
>> >>> context
>> >>>    - Lots of bug-fixes
>> >>>
>> >>> When upgrading from ES 1.x to 5.x you may need to do an export/import,
>> >>> and/or follow Elasticsearch's own migration procedures if you prefer.
>> >>>
>> >>> Vert.x (Gateway Only):
>> >>>
>> >>>
>> >>> http://downloads.jboss.org/apiman/1.4.0.Final/apiman-distro-vertx-1.4.0.Final.zip
>> >>>
>> >>> WF10/EAP7.1:
>> >>>
>> >>>
>> >>> http://downloads.jboss.org/apiman/1.4.0.Final/apiman-distro-wildfly10-1.4.0.Final-overlay.zip
>> >>>
>> >>> WF11:
>> >>>
>> >>>
>> >>> http://downloads.jboss.org/apiman/1.4.0.Final/apiman-distro-wildfly11-1.4.0.Final-overlay.zip
>> >>>
>> >>> EAP7:
>> >>>
>> >>>
>> >>> http://downloads.jboss.org/apiman/1.4.0.Final/apiman-distro-eap7-1.4.0.Final-overlay.zip
>> >>>
>> >>> Tomcat 8+:
>> >>>
>> >>>
>> >>> http://downloads.jboss.org/apiman/1.4.0.Final/apiman-distro-tomcat8-1.4.0.Final-overlay.zip
>> >>>
>> >>> Regards,
>> >>> Marc
>> >>> _______________________________________________
>> >>> Apiman-user mailing list
>> >>> Apiman-user@lists.jboss.org
>> >>> https://lists.jboss.org/mailman/listinfo/apiman-user