Multiple instances of ApexListener Glassfish are not working (same domain)

Apex Listener 1.1
Glassfish 3.1

I have two domains, domain1 (Apex 3.2.1) and domain2 (Apex 4.0.2)

Each one has its own apex-config.xml file (${java.io.tmpdir}/apex1/apex-config.xml and ${java.io.tmpdir}/apex2/apex-config.xml) . I have used Udo's advice (Re: How to change apex-config.xml location to do it. So far , so good.

Now, I try to put a second ApexListener on domain1, pointing to another database. I create another file, ${java.io.tmpdir}/apex3/apex-config.xml, and, after installing the corresponding apex listener war on domain 1, i go directly to APEX URL, without running listenerConfigure.
And I fall on DB pointed by apex1/apex-config.xml, though the URL shows apex3 in it.
When I try to do localhost:port/apex3/listenerAdmin, I see all fields protected and filled with data for apex1/apex-config.xml .

Any idea what went wrong and how to fix it?

Of course, I can create one domain per Apex DB, but maintaining many /i/ directories (our css, js and other libraries live there) instead of one or two seems too heavy to me.

Igor