How get instances information in cluster Java AS

I have arbitrary java claster Architecture.

I do solution to parse Java AS logs files and and further processing it. Files are in

/usr/sap/<SID>/J00/j2ee/cluster/server0/log/system

How can I get information about all AS instances in claster (hosts) to log in and read the files?

Now I use simple file to store hosts list but it is not convenient and it will extra work for SAP admin when add new AS instance (He can forget to add new host in file ).

I read about config tool but did not found simple way to get cluster hosts list. I use Java, where are some java, bapi, OS tools and utils to get it?