
Originally Posted by
shvaber
by default Maven repository folder located at user's home folder, as hidden .m2 folder.
Exit from STS, remove please .m2 and start STS again. This folder will be recreated. And, you could also check eclipse .log file, there could be the reasons of your troubles.
Log file is located in workspace folder - .metadata (hidden folder again) - .log
Also, if you are using proxy, you should edit maven..../conf/settings.xml and add proxy there. And in STS - check proxy settings too.