What should I do in this case?
This is what I can see from head
Look at logs, pending tasks..
Could that be because of this?
Unable to lock JVM memory (ENOMEM). This can result in part of the JVM being swapped out. Increase RLIMIT_MEMLOCK (ulimit).
It is the only strange thing I see
May be.
Nothing, the WARNING I'm seeing all the time is
exception caught on transport layer .... closing connection