Maven dependencies not visible in WEB-INF/lib

This should have nothing to do with eclipse and m2eclipse, and optionally for better support - m2e-wtp. Also, you don't need copy-dependencies. Here are a few possible reasons:

• you should invoke mvn package (or right-click > maven > package) and obtain a war file - the <packaging> (in the pom) must be war
• your dependencies should be with the default scope (if they are provided or test they will not be included in the archive)
• if you are running the project as dynamic web project on a server within eclipse, then you should open the project properties (right click > properties) and select "Deployment Assembly". There click "add", select "build path entries", and choose "maven dependencies". This will instruct WTP to send the maven dependencies to the server dir.

First install Maven Integration For Eclipse WTP (Help->Eclipse Marketplace)

Then in your web project's pom.xml just add:

    <packaging>war</packaging>

After that just right click the project, Maven -> Update Project, which should automagically add Maven Dependencies for you in the Deployment Assembly.