Project – SLF4j
Shipped Version with JBPM 7.1 – 1.7.7
Release Date – Apr 2014
EOL Date – Apr 2017
Latest Version – 1.7.25
Release Date – March 2017
Issue – Version EOL (End of Life)

We need to upgrade the dependency of this jar to latest version, since the component shipped with JBPM 7.1 is marked as Version EOL