EM doesn't work after OIM 11g installation.

<BEA-101162> <User defined listener oracle.sysman.eml.app.ContextInitializer failed: java.lang.NoClassDefFoundError: HTTPClient/ProtocolNotSuppException."

Solution:
The  workaround is to copy http_client.jar:

from
$ORACLE_HOME/oui/jlib

to
$DOMAIN_HOME/lib

After This change EM console is accessible.

Trivia on Oracle Data Integrator

Upgrade ODI ??How to find the exact patch number.

http://www.myoraclesupports.com/content/master-note-oracle-data-integrator-odi-and-legacy-sunopsis-releases-and-patches