From Tomcat 8, one’s got to use Tomcat’s own InstrumentableClassLoader
NOTE: Requires Apache Tomcat version 6.0 or higher, as of Spring 4.0. This class is not intended to work on Tomcat 8.0+; please rely on Tomcat’s own InstrumentableClassLoader facility instead, as autodetected by Spring’s TomcatLoadTimeWeaver.
For Contrast-Finder, I tested with docker and Tomcat 8.5 (Ubuntu 18.04 image : next LTS release). Just remove the following line from the webapp/src/main/webapp/META-INF/context.xml file and it’s works:
For Asqatasun, libspring-instrument-java is not required since the following commit : fd1ebfe (10 Apr 2014, before the fork). See the context.xml file on the master branch.