If you want to use the Sesame - Jena adapter from your code, eg. to create a local Sesame repository or to use the Jena-style RQL / SeRQL interface, be sure to have the required libraries (listed below) in the classpath.

If you want to use the adapter from your Sesame server you need to put those libraries in the $SESAME_WEBAPP/WEB-INF/lib/ directory, assuming $SESAME_WEBAPP points to your sesame folder inside your servlet container (eg. Tomcat) [servlet.jar and xercesImpl.jar are already there].

The required libraries are:

sjadapter.jar

from Jena (look in the lib/ directory of the latest Jena release)
commons-logging.jar
concurrent.jar
icu4j.jar
jakarta-oro-XXX.jar
jena.jar
junit.jar
log4j-XXX.jar
xercesImpl.jar

from Sesame (look in the lib/ directory of the latest Sesame release)
sesame.jar