set up and test tomcat on Centos

http://askubuntu.com/questions/135824/what-is-the-tomcat-installation-directory
https://www.digitalocean.com/community/tutorials/how-to-install-apache-tomcat-7-on-centos-7-via-yum
http://stackoverflow.com/questions/4965914/java-jsp-vs-servlet
http://www.server-world.info/en/note?os=CentOS_6&p=oracle11g&f=2
http://cs.brynmawr.edu/~dkumar/JSP/
http://docs.jboss.org/tools/4.0.0.Final/en/GettingStartedGuide/html/jsp_application.html
http://tecadmin.net/steps-to-install-tomcat-server-on-centos-rhel/#
http://stackoverflow.com/questions/5407703/javac-command-not-found
http://www.tutorialspoint.com/servlets/servlets-first-example.htm
http://introcs.cs.princeton.edu/java/11hello/HelloWorld.java.html
http://stackoverflow.com/questions/9193228/compile-error-package-javax-servlet-does-not-exist
http://stackoverflow.com/questions/4076601/how-do-i-import-the-javax-servlet-api-in-my-eclipse-project
http://stackoverflow.com/questions/13776169/solving-a-package-javax-servlet-http-does-not-exist-error-possible-command-issu
https://docs.oracle.com/cd/E11882_01/appdev.112/e12137/getconn.htm#TDPJD133
https://docs.oracle.com/cd/E11882_01/appdev.112/e12137/getconn.htm#TDPJD130
https://docs.oracle.com/javase/tutorial/jdbc/basics/connecting.html
http://docs.oracle.com/cd/B28359_01/appdev.111/b28765/introduction.htm
http://www.mkyong.com/jdbc/connect-to-oracle-db-via-jdbc-driver-java/
http://www.oracle.com/technetwork/database/features/jdbc/index-091264.html
http://www.tecmint.com/oracle-database-11g-release-2-installation-in-linux/
http://www.oracle.com/technetwork/articles/servers-storage-admin/ginnydbinstallonlinux-488779.html
http://stackoverflow.com/questions/16342075/generate-war-file-from-tomcat-webapp-folder
http://stackoverflow.com/questions/29245567/how-to-create-a-war-file-using-the-commandline
http://michael1e.com/create-war-file-in-command-prompt/