eclipse m2eclipse not working

Question

the m2eclipse plugin is latest the eclipse is the latest the JDK is jdk7 the eclipse uses embedded maven version 3.xxx

I am keep getting this error “Error: Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher”

Answer 1

my envirement
eclipse version : 4.3 kepler
maven version : 3.2.x
OS : windows 7
m2e plugin version : 1.5

the problem caused by combination of things, e.g mismatch between maven installation and setting.xml is one, but mainly the problem was:

solution for my problem was to run the eclipse in administrator mode.

you can run maven embedded (comes with eclipse) or external installation
just to make sure they are pointing to the right setting.xml file

somehow the embedded disappears sometimes, just restart eclipse it will appear again

finally I can confirm the latest m2e 1.5 or above supports maven 3.

Note:

set JAVA_HOME is a must, because maven uses it to look up java which runs maven itself

set non-embeded maven installation location in the windows path is needed

set M2_HOME was NOT needed in my case, thus to get m2e working in eclipse or interact maven though command line, M2_HOME is not needed

Answer 2

It seems that there are some problems running the embedded Maven.

Try installing a fresh Maven version, then click Preferences , Maven, Installationsand set the directory where you have installed Maven.