Recently I started using Maven for my JAVA projects on NetBeans and as I am under a proxy where I work, NetBeans was having problems downloading the repository from maven.apache.org even if you have set under preferences to use the proxy system configuration. Here is the solution.
Look if you have a settings.xml under the maven folder in your user:
If you don’t have it, you can copy it from your NetBeans folder (OS X):
Then uncomment the proxies section as follow: