Another thing you might try is to run a tail on the module being used by tomcat to get a psudo'ish strace.
tail -f /proc/(PID of Tomcat)/map_files/(module being called by tomcat) | od -a
Different od flags for translation:
From
http://unixhelp.ed.ac.uk/CGI/man-cgi?od
-a same as -t a, select named characters
-b same as -t o1, select octal bytes
-c same as -t c, select ASCII characters or backslash escapes
-d same as -t u2, select unsigned decimal 2-byte units
-f same as -t fF, select floats
-i same as -t dI, select decimal ints
-l same as -t dL, select decimal longs
-o same as -t o2, select octal 2-byte units
-s same as -t d2, select decimal 2-byte units
-x same as -t x2, select hexadecimal 2-byte units