forgotten the JIRA administrator password

from jira-manual:

I have forgotten the JIRA administrator password, and cannot retrieve it as mail
notification is not set up.!

You will need to temporarily remove security restrictions, reset the password, then reenable them.
This can be done as follows:
1. Locate the WEB-INF/classes/security-config.xml file (in 2.5 and above it is called
seraph-config.xml).
2. Comment out everything between the <services> tags:
<security-config>
...
<services>
<!--
<service class="com.atlassian.seraph.service.PathService">
<init-param>
<param-name>config.file</param-name>
<param-value>/seraph-paths.xml</param-value>
</init-param>
</service>
<service class="com.atlassian.seraph.service.WebworkService">
<init-param>
<param-name>action.extension</param-name>
<param-value>jspa</param-value>
</init-param>
</service>
-->
</services>
...
</security-config>
3. Restart JIRA
You will now be able to access all of JIRA without logging on. You won't get any menus however,
so you will need to access all the URLs directly, eg.
• For setting Administrator and User global permissions: http://<your
server>/secure/admin/jira/GlobalPermissions.jspa
• For adding a group: http://<your-server>/secure/admin/user/GroupBrowser.jspa
• Searching for and editing users: http://<your-server>/secure/admin/user/UserBrowser.jspa
3.32. I cannot get past the login page. After clicking the "Log In" button, the login page just
refreshes.
This usually occurs when JIRA cannot set a browser cookie. Ensure that cookies are allowed in your
browser settings.
If you are using IE6, check that your server name does not have an underscore ("_") in it, as IE6 has
a problem with this (see JRA-1624).