Why would you need a package for Eclipse. Download it is a ZIP, extract it in the location of your choice and run it from there. (Portable app)
I have been using it like that almost every day for 15 years now.
I have been using it like that almost every day for 15 years now.
My theory is that it is obviously because there is a way how to run Eclipse, without any issues and without the need of an officially tested debian package, so there is not huge demand.
Something like Netbeans doesn't need a debian package but Eclipse is split into lots of jar files that each depends on some shared libraries.