Classloader problem for Event classes

There is a class loader problem in Tomcat.
In case when event classes present within web application file (war),
we need to provide shared classloader for jaxb context while unmarshal
event. Because the Catalina classloader needs to be able to see those
classes. If they are in shared, they are not visible to the core
Tomcat code.

In case when event present in jar file it has to be visible by the
common/lib classloader.

Thanks and regards,
Alexey

PS:
http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html