Given that TeeFilter is part of web.xml it transpires into production which can be highly undesirable.

Example:

<filter>
<filter-name>TeeFilter</filter-name>
<filter-class>ch.qos.logback.access.servlet.TeeFilter</filter-class>
<init-param>
<param-name>ignoreOnHost</param-name>
<param-value>prodHost0, prodHost1</param-value>
</init-param>
</filter>