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Command to get info:
java -XshowSettings:properties -version

Get tomcat info:
java -cp lib/catalina.jar org.apache.catalina.util.ServerInfo

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Test if a port on a remote system is reachable: 
nc -zv 10.57.1.61 3307

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Hint, how to use port forwarding, which allows forward traffic on a port of your local computer to the SSH server, which is forwarded to a destination server.

On your local computer, type in command line:
ssh -N -L 7000:destination.server.com:9300 user@example.com

Any traffic comes to this port is sent to the SSH server and traffic received is sent to port 9300 of destination.server.com, which is the server itself.
Now, you get access to use 127.0.0.1 as the host and 7000 as the port.

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import groovy.time.TimeCategory 
import groovy.time.TimeDuration

 def timeStart = new Date()
 // do something here
 def timeStop = new Date()
 
 TimeDuration duration = TimeCategory.minus(timeStop, timeStart)
 println duration