I use tomcat7-maven-plugin to spin up a Tomcat 7 container where I canrun my web application. When I added dependencies for log4j2 (version2.11.0) to my project, I got the error: org.apache.tomcat.util.bcel.classfile.ClassFormatException:Invalid byte tag in constant pool: 19 Apparently, log4j2 is a multi-release jar and older versions of Tomcatcan’t handle that. So I needed to upgrade my Tomcat maven plugin. Solution: Update your Tomcat But how do you update your Tomcat? Its informationpage...
