For newer versions of IntelliJ, enable the use plugin registry option within the Maven settings as follows:
- Click File 🡒 Settings.
- Expand Build, Execution, Deployment 🡒 Build Tools 🡒 Maven.
- Check Use plugin registry.
- Click OK or Apply.
For IntelliJ 14.0.1, open the preferences—not settings—to find the plugin registry option:
- Click File 🡒 Preferences.
Regardless of version, also invalidate the caches:
- Click File 🡒 Invalidate Caches / Restart.
- Click Invalidate and Restart.
When IntelliJ starts again the problem should be vanquished.