HI zahir,
setting up technical monitoring is easy and almost same as for an abap system for us from the guided setup. The difference comes in how and kind of alerts for Java are different. if you understand the managed system configuration of a Java system then you can get a fair bit of an idea from solman's perspective.
you can refer below link for some help
System Monitoring - How-to Guides - Technical Operations - SCN Wiki
On setting up technical monitoring if you face any issue you can share the same so we can work on those part.
Regards,