The old version of Eclipse online installation maven is too troublesome, to install a lot of dependencies, sometimes for a half-day, but also can not press, not the lack of that.
and the online recommendation Maven plugin link http://m2eclipse.sonatype.org/sites/m2e has expired,
Valid links can be found in http://www.eclipse.org/m2e/download/
Update siteslatest m2e Release (recommended)
Http://download.eclipse.org/technology/m2e/releases
M2E Milestone builds towards version 1.5
http://download.eclipse.org/technology/m2e/milestones/1.5
Latest m2e 1.6 SNAPSHOT build (not tested, not hosted at eclipse.org)
http://repository.takari.io:8081/nexus/content/sites/m2e.extras/m2e/1.6.0/N/LATEST/
How to install I will not introduce, said more are tears ...
I recommend using the new Eclipse:eclipse-jee-luna-r-win32
This edition integrates Maven, Git, and works well.
I installed the Force sync plugin File Sync again