In order to satisfy a certain criterium, there is a need to publish a message to an existing ActiveMQ instance. Currently we use different software and a JMS-based connection to publish and read messages.
I did find about the additional plugins where MQTT is listed. We don't prefer to use that protocol if not required.
I could not find any plugins for Apache Hop that deal with receiving/sending over JMS, so is that an option?
I will unfortunately have to disappoint you in this case. As far as I know no one has written a plugin to support ActiveMQ yet.
You can create a ticket on our jira to request a community member to create such a transform(s). Or we can support you through our mailing-list if you have specific questions when writing a plugin to support it.