Maven error - java.lang.NoClassDefFoundError: org/slf4j/helpers/MarkerIgnoringBase

Question

Getting up and running with Maven.

Trying to build a project I\'ve inherited. I\'ve resolved majority of the issues but am now seeing a weird error:

Answer 1

This happened to me when doing:

brew upgrade

It automatically updated my maven version to 3.3.3 that seems to have some issues as I was getting exactly the same message as the original post.

My solution was:

brew uninstall maven                               // to get rid of 3.3.3
brew install homebrew/versions/maven32             // to install maven 
brew pin homebrew/versions/maven32                 // to prevent unintended upgrade

And then make sure you have a line like this on ~/.bash_profile pointing to the correct maven path:

export M2_HOME=~/usr/local/Cellar/maven32/3.2.5    ~/.bash_profile