Problem Definition:-
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Usually these type of errors will be seen in WebLogic, WebSphere, Tomcat logs due to Unix resource exhaustion ie. when soft limit of the open file descriptor crossed the specified limit value.
Before increasing the open file descriptor limit just check is there any process holding lock for deleted log files by using lsof command.
Solution-1) Increase the open file descriptor value temporarily at user session level.
Example:
ulimit -n #command for checking current value of file descriptor
ulimit -n 8192 # Command for increasing file descriptor value
Solution-2) Increase the file descriptor limit using WebLogic commEnv.sh upto 12.1.3 OR commBaseEnv.sh from 12.2.1.1.0 on wards.
Change from 4096 to higher value
Similar to below
Solution-3) Change the soft limit of file descriptor using /etc/security/limits.conf
Current value: 4096 for wlsuser
login to root user & Add OR update /etc/security/limits.conf with below content at the end of file.Save & Close the file.
wlsuser soft nproc 2047
wlsuser hard nproc 16384
wlsuser soft nofile 8192
wlsuser hard nofile 65536
Now login to wlsuser & check the value of file descriptor
