Running STS 2.9.2, VMware vFabric tc Server Developer Edition v2.7. tc Server has been run but is currently stopped.
mvn building my project outside STS:
mvn clean install
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.4.1:clean (default-clean) on project xxx-yyy: Failed to clean project: Failed to delete C:\.....\xxx-yyy\target\tools-1.4.2.jar -> [Help 1]
Shutting down STS frees the handle. (I'm not sure why tools.jar ends up in target, either...)
I'm submitting this to the STS forum because it could be STS, it could be Eclipse, it could be tc Server, it could be m2e, etc.