Spring Flex test drive

When I imported the test drive into my workspace I get a lot of jar files missing like the following. What is the best way to resolve them. Do I manually download them or is there a right way to fix this ?

Unbound classpath variable: 'M2_REPO/aopalliance/aopalliance/1.0/aopalliance-1.0.jar' in project 'testdrive' testdrive Build path Build Path Problem

Fixed. Used Maven to download the related jars in the pom.xml.