I'm very new in spring and have just downloaded sts 2.7.2 and installed it with roo. It's possible to open roo shell for projects, but impossible to use roo commands, because they all return only "null" value. What's wrong? It's possible to use roo started from 'bin/roo.sh'. I've added roo folder path to 'window/preferences/spring/roo support'.
Which version of the JDK did you install Spring STS with? I've noticed that Roo shell doesn't execute well through the IDE with JDK 7. Try removing your Spring STS, adding the Spring Source Roo bin folder to your Path, and re-installing STS using JDK 6 or lower.