Hi, I am trying to use the LogbackValve but am getting the following error (and tomcat fails to start) when adding the valve to the CATALINA_BASE/conf/server.xml file: ERROR main org.apache.tomcat.util.digester.Digester - Begin event threw error java.lang.NoClassDefFoundError: org/apache/catalina/Lifecycle at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.7.0_04] … Caused by: java.lang.ClassNotFoundException: org.apache.catalina.Lifecycle at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[na:1.7.0_04] … Environment is as follows: Tomcat 7.0.57 (with APR) logback 1.1.3 with the tomcat environment being set with the following CATALINA_BASE/bin/setenv.sh file: #!/bin/sh CLASSPATH=$CLASSPATH:$CATALINA_BASE/bin/jul-to-slf4j-1.7.12.jar:\ $CATALINA_BASE/bin/jcl-over-slf4j-1.7.12.jar:\ $CATALINA_BASE/bin/slf4j-api-1.7.12.jar:\ $CATALINA_BASE/bin/logback-core-1.1.3.jar:\ $CATALINA_BASE/bin/logback-classic-1.1.3.jar:\ $CATALINA_BASE/bin/logback-access-1.1.3.jar:\ $CATALINA_BASE/bin/logback-config/ This seems strange to me as the Lifecycle interface should be available in the catalina.jar file, which must be on the class path….. Any ideas? Thanks in advance, John