This is a popular problem. The most common cause it either the ORDS.war is not configure to the present database settings using the
>java -jar ords.war setup
OR the configuration directory is not pointed to the right directory using
> java -jar ords.war configdir <path to directory eg. /apex/config>
I suggest you do check it out .
thanks so much....this solved my newbie problem.... am on my way to explore APEX with EBUSINESS
thanks so much Jari....this got me to retrace my steps....missed the java -jar ords.war step...to configure the WAR file ....