RedHat Fuse 7.5 - Can't deploy feature - osgi

Question

Using RedHat Fuse 7.5 for Apache Karaf platform on Windows 10. I'm defining the feature shown below:
...
<feature name="customers-data" version="${project.version}">
<feature>transaction</feature>
<feature>jndi</feature>
<feature>pax-jdbc-config</feature>
<feature>pax-jdbc-oracle</feature>
<feature>pax-jdbc-pool-dbcp2</feature>
<feature>jdbc</feature>
<feature dependency="true">aries-blueprint</feature>
<feature>jpa</feature>
<feature>hibernate</feature>
<bundle>...</bundle>
</feature>
...
Adding the the new repo works as expected but trying to install the feature:
karaf#root()> feature:install customers-data
raises the following exception:
2019-12-12 17:43:02,385 | WARN | ownloader-5-thread-7 | o.o.p.u.m.i.AetherBasedResolver | 5 - org.ops4j.pax.url.mvn - 2.6.1 | Error resolving artifact
org.apache.aries.jpa.javax.persistence:javax.persistence_2.1:jar:2.7.2: [Could not transfer artifact org.apache.aries.jpa.javax.persistence:javax.persistence_2.1:jar:2.7.2 from/to maven.central.repo
(https://repo1.maven.org/maven2/): Connect to repo1.maven.org:443 [repo1.maven.org/151.101.36.209] failed: connect timed out, Could not transfer artifact
org.apache.aries.jpa.javax.persistence:javax.persistence_2.1:jar:2.7.2 from/to redhat.ga.repo
(https://maven.repository.redhat.com/ga/): Connect to maven.repository.redhat.com:443
[maven.repository.redhat.com/23.60.31.183] failed: connect timed out
Looking up the features I got this:
karaf#root()> feature:list | grep aries-jpa
jpa | 2.7.2 | | Uninstalled | aries-jpa-2.7.2 | OSGi Persistence Container
karaf#root()>
So the feature aries-jpa-2.7.2 is registered. Trying to install it:
karaf#root()> feature:install jpa
raises the same exception as mentioned above.
Could any one please shad some light here ?
Many thanks in advance.
Kind regards,
Nicolas

Answer 1

The issue was caused by the fact that Karaf doesn't use the local maven install and its settings but its own one. So, when behind an HTTP proxy, as it was my case, one needs either to configure Karaf to use the HTTP proxy or to tell it to use the local maven settings. This happens in $KARAF_HOME/etc/org.ops4j.pax.url.mvn.cfg file.