A hard crash of the JVM (use ps to see if the JVM process is still running)
A soft crash of the application (look at Tomcat application logs)
Running out of file descriptors (use lsof | wc -l and compare to ulimit -n of the application user)
I revised ulimit -n... I set it to other values... nothing.
while trying to load the app, if I refresh the browser I get
child pid 10681 exit signal Bus error (7)...