Hello
SAP J2EE stores most of the configuration settings and parameters at the OS level and also at the file system level.
You can find some reasonable information (memory parameters, thread manager configuration, server node and bootstrap configuration, etc) from the properties files in the below locations:
/usr/sap/SID/DVEBMGS00/j2ee/cluster/instance.properties
/usr/sap/SID/DVEBMGS00/j2ee/cluster/bootstrap/bootstrap.properties
/usr/sap/SID/DVEBMGS00/j2ee/cluster/dispatcher/cfg/kernel
/usr/sap/SID/DVEBMGS00/j2ee/cluster/server0/cfg/kernel
The information related to the UME settings, roles, etc are stored in the database tables.
Additionally there are tables under the Java schema which are holding some configuration details.
This is not documented anywhere for me to confirm.
Good Luck
RB