To avoid runtime loading errors, make sure the Adobe-signed Flex 4 RSL dependencies are listed first in your pom.xml file. You should match the order of the Adobe framework RSLs defined in sdks/4.1.0/frameworks/flex-config.xml by the order of the elements. The RSL runtime loading sequence matches the Flex compiler SWC linking sequence. The flex-mojos plugin relies on Maven for dependency resolution and sequencing. Maven sequences the dependencies using the order specified in the dependencies section. Maven will use the first matching dependency encountered in the case of duplicates/conflicts. Here is an example pom.xml snippet.