I know the title may be weird, but this is exactly what happens when I tried to install NNMi 8.10 and its database is a remote Oracle 10.2.0.4 although the oracle version does not matter, but this is just for info.
the steps as per the guide was to create a user with sufficient privilege which is stated clearly to be
FLASHBACK ANY TABLE
although I have all these configured but I got an 404 error on the quicklaunch website and all NNMi websites.
Anyway, I checked the logs (jbossserver.log) and I found error related to tables or views could not be found, I checked the oracle server and I found there is no table created by NNMi user.
the problem was the tablespace quota assigment to NNMI user, if you create the user account using the sqlplus you can use below commands:
alter user <user_name> quota unlimited on <tablespace_name>; alter user <user_name> quota 1M on <tablespace_name>;