Maven error : Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher [duplicate]

Answer 1

Removing old Maven Version and Restoring the newer one solved my problem. I was using Maven 3.2.3 earlier with Java 1.8.0_65. Just tried replacing earlier maven version with 3.3.9 , made changes to environment variables and it worked.

Answer 2

In my experience, please check your /bin/mvn which is a POSIX shell script. In the script, it firstly finds maven related env from for e.g. /etc/mavenrc or $HOME/.mavenrc. In my case, in /etc/mavenrc, the M2_HOME env variable was set to the one I had removed, then after I set M2_HOME to the new maven installation, "mvn -v" worked.

Answer 3

Restarting the eclipse resolved the issue for me.

Answer 4

Seems that this issue is now appearing inside openjdk docker (I use circleci/openjdk:8-jdk).

See bug report

Answer 5

Please remove M2_HOME as environment variable, it is already set by the mvn script. The only things you need to do is: add apache-maven-3.x.x/bin to your path, set JAVA_HOME as environment variable. So no need to add %JAVA_HOME%/bin to your path

Try to run mvn -v from /Library/Maven-3.3.3/bin/ folder first to confirm the installation is correct. Try to run mvn with xtrace info (tldp.org/LDP/Bash-Beginners-Guide/html/sect_02_03.html) and verify the commandline built up by Maven. I assume you get an unexpected classpath argument value.

Answer 6

In my case M2_HOME was pointing to /usr/share/maven3; but ith should have been:

M2_HOME=/usr/share/maven

in .bashrc