We recently had to uninstall the OBIEE installation on our development server but unfortunately noone remembered the password in the team. After some reasearch we were able to figure out a way to reset the OC4J Admin password.
Open up the file ORACLE_HOME\oc4j_bi\j2ee\home\config\system-jazn-data.xml in a text editor.
Find the line that defines the credentials property for the admin user
Enter the new password prefixed by an exclamation mark between the credentials tag e.g. – ” !newpassword “
Start the services and you should be able to uninstall OBIEE with the new password.
<user>
<name>oc4jadmin</name>
<display-name>OC4J Administrator</display-name>
<guid>0E645260306811DCBFEA1DBAFA3DF35A</guid>
<description>OC4J Administrator</description>
<credentials>{903}MnAD+UUULZVKTheGctZt+WWD8IYOmYh/</credentials>
</user>
<name>oc4jadmin</name>
<display-name>OC4J Administrator</display-name>
<guid>0E645260306811DCBFEA1DBAFA3DF35A</guid>
<description>OC4J Administrator</description>
<credentials>{903}MnAD+UUULZVKTheGctZt+WWD8IYOmYh/</credentials>
</user>
Replace the existing encrypted password with the new password.
Be sure to prefix the password with an exclamation point (!). For example:
<credentials>!newpassword</credentials>
<credentials>!newpassword</credentials>