Is it possible to remove messages from an ActiveMQ Artemis queue that don't have an attribute?

I’d need to remove messages from a DLQ in ActiveMQ Artemis that don’t have an attribute set.

As I understand, the JMX operation removeMessages(string) supports a filter expression, but I’m not sure if it’s possible to use something like "attribute is NULL". Is it?

>Solution :

As noted in the ActiveMQ Artemis documentation, the filter expression syntax supported by the broker mirrors the syntax of JMS selectors which is documented here. Regarding selectors, this documentation states:

If a property that does not exist in a message is referenced, its value is NULL.

So, you can use a selector like attribute is NULL.