CentOS

I was trying to bring up my inhouse application, it throws the following error.

Open --- : no space left on device.
Free command output shows the below

total used free shared buff/cache available
Mem: 65701524 7035076 54496192 1446896 4170256 56688084
Swap: 4194300 0 4194300

I do not need any other apps running and consuming memory, so trying to figureout the culprit and used the following command.

ps -o pid,user,%mem,command ax | sort -b -k3 -r

That shows me the following in 3 rows consuming high memory .
java -Djava.security.egd=file:/dev/./urandom -jar /app.jar

I am new to Linux/centos please suggest on how do I solve it.

It's more likely to be disk space.