About upgrading to AEM from livecycle es2

Greetings,

We have a few adobe livecycle es 2 appliations in one of our customer. These applications require a external  jar file which is developed by our former coligue and this file is located under {livecycleES2 instalation path} \jboss\server\lc_turnkey\lib .

Recently our customer decided to upgrade to es 4 version and we have tested this jar also in es4 by simply copying the file under same location  and everything  was ok.

But as a last minute decision our customer upgraded their environment to AEM . This time I could not find related folder under jboss installation..

Where should I copy this exteranal jar file?

Kind regards,