It sounds like you don't have the webtier correctly
installed... the /WEB-INF/flex-bootstrap.jar
looks for classes in the /WEB-INF/flex/jars/... folder. Did
you perhaps try
to upgrade and old Flex application and only copied
> Having installed the flex data services express edition
> tomcat5.5, the following exception occurs every time I
> *.mxml request:
> It might help in tracing the problem to know what class
> referred to that cannot be found. Any ideas?
I had this problem; it turned out to be because I'd
configured my Tomcat server by default with unpackWARs="false".
You might want to take a look at the "Running from a
compressed WAR" section of the install notes at: