about proxy settings

As a developer I tried to install OpenMRS and I tried it by using git and maven. then here I’m behind to proxy settings and I changed all the settings for mvn clean install. then it installed clearly. After that when I tried to do mvn jetty :run it’s coming as a build failure. here I’m using my proxy settings on port no 3128 I changed mvn proxy settings also by using nexus. but still it is coming as a build failure. what is the problem of that?