How to extract java stack trace log from tomcat log file?

• catalina.out - Tomcat output file.

• ERROR - The keyword displayed in the log file containing the java stack trace.
  
  sed -n '/ERROR/p; //,/^[0-9]\{4\}-/ {/^[0-9]\{4\}-/!p}' catalina.out
  

 Ref : https://www.unix.com/shell-programming-and-scripting/277433-using-grep-finding-stacktraces.html