Hi Mark, I also use log4j2 in my web app. dev in eclipse, when adding the log4j2 jars to tomcat 7,8, or 9 runtime, it has this problem, log4j2.xml is provided as VM parameter. Web app firsts instantiates log4j2, and then tries to config log4j2 again, throwing the following error due to double class loading:
ERROR StatusLogger Unrecognized format specifier [d] ERROR StatusLogger Unrecognized conversion specifier [d] starting at position 16 in conversion pattern. ERROR StatusLogger Unrecognized format specifier [thread] ERROR StatusLogger Unrecognized conversion specifier [thread] starting at position 25 in conversion pattern. ERROR StatusLogger Unrecognized format specifier [level] ERROR StatusLogger Unrecognized conversion specifier [level] starting at position 35 in conversion pattern. ERROR StatusLogger Unrecognized format specifier [logger] ERROR StatusLogger Unrecognized conversion specifier [logger] starting at position 47 in conversion pattern. ERROR StatusLogger Unrecognized format specifier [msg] ERROR StatusLogger Unrecognized conversion specifier [msg] starting at position 54 in conversion pattern. ERROR StatusLogger Unrecognized format specifier [n] ERROR StatusLogger Unrecognized conversion specifier [n] starting at position 56 in conversion pattern. ERROR StatusLogger Reconfiguration failed: No configuration found for '18b4aac2' at 'null' in 'null' Please note there is problem in the simple log4j2.xml for testing, which can be loaded successfully when there is no double class loading. -aj On Thu, May 7, 2020 at 1:53 PM Mark Thomas <ma...@apache.org> wrote: > On 07/05/2020 21:40, AJ Chen wrote: > > I use eclipse to develop web app for tomcat, Web app has a dependent > > project and so the dependent project and all jars are added on the > > classpath for tomcat runtime. Log4j works on tomcat 6. But after upgrate > to > > tomcat 9, log4j failed to start with the following error. Anyone has seen > > similar problem? log4j2 also failed. Thanks. > > Note: log4j is no longer supported. > > How, exactly, is log4j configured? What JAR files and what configuration > files are where? Any other configuration? > > Mark > > > > > > log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is not > > assignable to a "org.apache.log4j.Appender" variable. > > log4j:ERROR The class "org.apache.log4j.Appender" was loaded by > > log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas object > of > > type > > log4j:ERROR "org.apache.log4j.DailyRollingFileAppender" was loaded by > > [ParallelWebappClassLoader > > > > aj > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
