You're not suppose to extend LoginFailure. You should create a class that implements AuthFailure.
1 #
2 # Input a list of comma delimited class names that implement
3 # com.liferay.portal.security.auth.AuthFailure. These classes will run when
4 # a user has a failed login or when a user has reached the maximum number of
5 # failed logins.
6 #
7 auth.failure=com.liferay.portal.security.auth.LoginFailure
8 auth.max.failures=com.liferay.portal.security.auth.LoginMaxFailures
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