After setting up AsyncAppenders for the application log, I tried to use them on the request log (I am using Jetty) and I get this exception: 13:19:56,792 |-ERROR in ch.qos.logback.classic.AsyncAppender[async-request] - Appender [async-request] failed to append. java.lang.ClassCastException: ch.qos.logback.access.spi.AccessEvent cannot be cast to ch.qos.logback.classic.spi.ILoggingEvent at java.lang.ClassCastException: ch.qos.logback.access.spi.AccessEvent cannot be cast to ch.qos.logback.classic.spi.ILoggingEvent at at ch.qos.logback.classic.AsyncAppender.preprocess(AsyncAppender.java:28) at at ch.qos.logback.core.AsyncAppenderBase.append(AsyncAppenderBase.java:129) at at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:88) at at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:48) at at ch.qos.logback.access.jetty.RequestLogImpl.log(RequestLogImpl.java:142) Later I have found at the docs "AsyncAppender logs ILoggingEvents asynchronously", so it seems that they can't be used with logback access, is that correct? Thanks.