When using FDS 2 with Tomcat, there are extra files to install and configure. Please see flex install doc
1. About JOTM:
You must install JOTM from http://jotm.objectweb.org, and make sure you copy the JAR files from jotm-root/lib to tomcat-root/common/lib. The jar files are:
2. About JMX
If you are using jdk 1.5. and up, then you don’t need to do anything about this. You will only need to install JMX if you are using JDK 1.4.x.