You can find the SAP Java system information from the below URL. Change the IP address and the xx based on your SAP system.
http://<IP-ADDRESS:5xx00/sap/monitoring/SystemInfo
You can find below information from the page.
• System/Instance/nodes identification
• Instance and node state
• Hostnames and open ports
• DB and OS version
• Installed Java software
• Java Runtime Environment version and settings
• Licensing information
