Hi Davor, I tried.
in AppModule: ... import org.slf4j.Logger; ... public RequestFilter buildTimingFilter(final Logger log) pom.xml: ... <artifactId>log4j</artifactId> <version>1.2.14</version> ... <tapestry-release-version>5.0.6-SNAPSHOT</tapestry-release-version> but... :( HTTP ERROR: 500 org.apache.log4j.Logger.isTraceEnabled()Z Marcus