Jar loader does not work with Tomcat plugin

I have the following line in my tomcat conf context.xml file

<Loader className="org.apache.catalina.loader.VirtualWebappLoader" virtualClasspath="${catalina.base}/lib/extra/*.jar;C:/Software/config/project/logging"/>

When I launch tomcat via the command line, there is no problem.

But when I start my appplication via the plugin, I hava a java.lang.ClassNotFoundException.

Can you help me?