Intellij idea cannot resolve anything in maven

In IntelliJ 12.1.4 I went through Settings --> Maven --> Importing and made sure the following was selected:

1. Import Maven projects automatically
2. Create IDEA modules for aggregator projects
3. Keep source...
4. Exclude build dir...
5. Use Maven output...
6. Generated souces folders: "detect automatically"
7. Phase to be...: "process-resources"
8. Automatically download: "sources" & "documentation"
9. Use Maven3 to import project
   • VM options for importer: -Xmx512m

This took me from having a lot of unresolved import statements to having everything resolved. I think the key here was using Maven3 to import project... Hopefully this helps.

I have encountered this problem，idea cannot download all dependent jar packages using maven,i just tried the following operations:

 mvn -U idea:idea

then all the dependent jar packages are download from the maven repository

Please note that idea plugin is retired