Is there a way to manually change the Password Expiry parameter in Crowd?

We have attempted to implement a solution stated in the a attached link with no success. In the following file we added the following lines:

/opt/atlassian/atlassian-crowd-2.8.4/crowd-webapp/WEB-INF/classes/crowd-ehcache.xml

<cache name="com.atlassian.crowd.model.token.ResetPasswordToken"
maxElementsInMemory="1024"
overflowToDisk="true"
diskPersistent="true"
timeToIdleSeconds="300"
timeToLiveSeconds="300"
/>

After applying the change we restarted Crowd, generated a reset Link for a user, and found that the link was still valid after 5 minutes.

https://answers.atlassian.com/questions/149767/change-crowd-password-reset-token-expiry-period-from-24-hours