According to this post, LifeRay provides a maven plugin to support portlet plugin development,but not mention whether it has provided a public official maven repository.
Can anyone get to know about that ?
It's well hidden, but when you look at the sources for maven projects, that's quite easy. The address for the repo is https://repository.liferay.com/nexus/content/repositories/liferay-releases-ce/. You might want to skip https and go with http (I had some problems with the certificate for the server and maven refused to connect to https repo)
Are these the artifacts you are looking for? http://search.maven.org/#search%7Cga%7C1%7Cliferay