My problem was solved when I restored defaults values of my Keys. Go to Window -> Preferences -> General -> Keys. Then, click Restore Defaults button at the bottom, and restart Eclipse. I am using Eclipse Juno.
from http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html package: take the compiled code and package it in its distributable format, such as a JAR. install: install the package into the local repository, for use as a dependency in other projects locally So the answer to your question is, it depends on whether you want it in installed into your local repo. … Read more