Maven error Could not find or load main class org codehaus plexus classworlds launcher Launcher

Question

I have installed a latest maven-3 0 4 on Windows 7  The installation details are as follows  Installation Path      C  apache-maven-3 0 4     Environment Variables are     M2 HOME C  apache-maven-3 0 4 apache-maven src   JAVA HOME C  Program Files Java jdk-1 7 0 04     Path variables added are      M2 HOME  bin  JAVA HOME  bin    In the command window it shows it like this     C   gt java -version   java version  1 7 0 04    Java TM  SE Runtime Environment  build 1 7 0 04-b22    Java HotSpot TM  Client VM  build 23 0-b21  mixed mode  sharing    C   gt mvn -version   Error  Could not find or load main class org codehaus plexus classworlds launcher Launcher     This is the only version on maven installed on my PC and the solution given on many blogs referring to the deletion of the previous M2 HOME environment variable is not valid    I have read and tried all the solutions given at blogs such as      oracle blog    stackoverflow question    another stack question    some blog      but still not able to get to it  What I might be missing in this whole thing  Thanks in advance

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The solution for later versions of Maven is straight-forward. I am on OS X ElCap, 10.11.6 and upgraded to Maven 3.3.9. I had the same problem with error "Could not find ...org.codehaus.plexus...". The link provided here offered the solution in a comment by McKamey - simply delete M2_HOME (unset M2_HOME). Once I tried that, it all worked as expected.

This can be confirmed by visiting the Maven install page: "Add the bin directory of the created directory apache-maven-3.3.9 to the PATH environment variable" -- no mention of M2_HOME or M3_HOME at all.

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I hit this problem too  and found this article   For Maven3  changing my environment variable name from M2 HOME to M3 HOME did the trick   I am on a Mac running OSX 10 9 with JDK 1 7   Hope this helps   Note  Please delete M2 HOME  if already set  Eg  unset M2 HOME

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I was having this same problem and was able to resolve it by carefully redoing the Environment Variables     M2 HOME   M2  JAVA HOME   Also  I made them all System Variables  not User Variables like the Maven instructions say  When you   echo  Path    Make sure you can see the  M2  and  JAVA HOME  variables completely expanded  i e     C  Users afairchild gt echo  Path  C  Program Files Apache Software Foundation apache-maven-3 0 4 bin C  Program Files Java jdk1 7 0 09 bin   etc

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It sounds like you installed  extracted  the source files instead of the binaries based on your path information   Try installing the binaries instead and following the other posters answer

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Just make sure you ve downloaded Binary zip archive apache-maven-3 5 0-bin zip  instead of Source zip archive  Then add the bin directory of the created directory apache-maven-3 5 0 to the PATH environment variable

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install binary version of maven fixes the issues  apache-maven-3 6 1-bin zip

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Well  I had this problem and after seeing this post and particularly khmarbaise answer I noticed that M2 HOME was   D  workspace apache-maven-3 1 0-bin apache-maven-3 1 0 bin   and then I chaged it to   D  workspace apache-maven-3 1 0-bin apache-maven-3 1 0   I would like to mention that I use windows 7  x64

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I find this issue in my centOS is caused by  Oracle Java is replace by gcj   after change default java to  Oracle Java   the issue is resolved   alternatives --config java  There are 2 programs which provide  java      Selection    Command -----------------------------------------------    1            usr lib jvm jre-1 5 0-gcj bin java    2            usr java jdk1 7 0 67 bin java

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Open a new terminal and do the followin  M2 HOME  Users macbook apache-maven-3 6 1   Set where maven is M2  M2 HOME bin                            Set home as bin export PATH  M2  PATH                     Place the new path   Then type  mvn -version   You can set this in   bash profile to do it automatically each time you run the terminal

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Next to the maybe useful  but maybe too symptomatic answers  here is one which tries to help to find the cause of the problem   Maven is a command-line java tool  That means  it is not a standalone binary  it is a collection of java  jars  interpreted by a jvm  java exe on windows  java on linux    The mvn command  is a script  On windows  it is a script called mvn cmd and on linux  it is a shell script  Thus  if you write  mvn install  what will happen    a command interpreter   bin sh or cmd exe  is called for the actual invoking script this script sets the needed environment variables and finally  it calls a java interpreter with the the required classpath which contain the maven functionality    The problem is with  2   Fortunately  this script is simply  very simple  For a java programmer it shouldn t be a big trouble to debug a script around 20 lines  even if it is a little bit alien language   On linux  you can debug shellscripts giving the -x flag to your shell interpreter  which is most probably bash   On windows  you have to find some other way to debug a cmd exe script  So  instead of mvn install  give the command bash -x mvn install   The result be like         -z              -f  etc mavenrc           -f  home picsa  mavenrc       cygwin true   darwin false      not so many things       MAVEN PROJECTBASEDIR  C  peter bin    export MAVEN PROJECTBASEDIR   MAVEN CMD LINE ARGS       export MAVEN CMD LINE ARGS   exec   cygdrive c Program Files Java jdk1 8 0 66 bin java  -classpath  C  peter boot plexus-classworlds-  jar   -Dclassworlds conf C  peter bin m2 conf   -Dmaven home C  peter   -Dmaven multiModuleProjectDirectory C  peter bin  org codehaus plexus classworlds launcher Launcher Fehler  Hauptklasse org codehaus plexus classworlds launcher Launcher konnte nicht gefunden oder geladen werden   At the end  you can easily test  which environment variable gone bad  and you can very easily fix your script  or set it what is needed

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Had this issue on two different Ubuntu 12 04 installs  despite the installs being done by apt-get  Issue was M2 HOME   Fixed with   export M2 HOME  usr share maven

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I believe this error caused because of downloading SRC instead of BINARY from Maven site  Please make sure to download Binary zip   Because the below path  you will get only when you download SRC      M2 HOME C  apache-maven-3 0 4 apache-maven src

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You should change the location of the M2 HOME into the following   set M2 HOME C  apache-maven-3 0 4 apache-maven   Furthermore the installation of the JDK looks more a JRE instead of JDK  For Maven you need JDK and NOT JRE

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For me  funny as it sounds  it helped just restarting eclipse

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I had a problem with surefire plugin itself  Going back to version 2 6 worked for me  Version 2 18 20 22 1 gave me the error  Now I tried version 3 0 0-M1 of surefire plugin and it works   So something is wrong in surefire plgin between version 2 6 and 3 0 0  I assume there is something hardcoded as default which should not

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I had the same issue  I have Windows xp box and when I would type mvn -version at the command line prompt I got the dreaded error message    Exception in thread  main  java lang NoClassDefFoundError  org codehaus plexus classworlds launcher Launcher    I confirmed that my M2 HOME variable was set to the path where Maven was installed on pc and that the echo  path  confirmed that Maven was in my path    I have been searching for a solution for hours when I stumbled on to my solution  I say my solution because I know this probably won t be the solution for everyone that is getting the same error     I copied the path that was assigned to my M2 HOME variable  I opened a cmd window and typed cd and pasted the path I got from my M2 HOME variable  At that point I knew that the path was correct because the path was displayed in the window  At this point I entered the dir command and to my surprise  I got the error File Not Found    I went to that path via Explorer and sure enough there were files present  I noticed that the folders were faded out  but I could access them and see the files within each folder  I have admin rights on my pc   I looked at the properties of the parent folder for Maven and saw that the Hidden box was checked  I removed the check and applied and tried my dir command again with success   Next I tried the mvn    version command again  but this time I got back the expected results   C   gt mvn -version Apache Maven 3 0 3  r1075438  2011-02-28 11 31 09-0600  Maven home  C  Program Files apache-maven-3 0 3 Java version  1 5 0 16  vendor  Sun Microsystems Inc  Java home  C  Java jdk1 5 0 16 jre Default locale  en US  platform encoding  Cp1252 OS name   windows xp   version   5 1   arch   x86   family   windows    Finally I created a jar and war file and my web app ran successfully on my local Tomcat   I hope this helps some of you out there

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I also faced the following Error in my system  Mac   Error  Could not find or load main class org codehaus plexus classworlds launcher Launcher  After doing some random browsing  I came across the link  http   maven apache org install html  that says  JAVA HOME  should be set to   Library Java JavaVirtualMachines jdk1 8 0 45 jdk Contents Home jre    When I changed  JAVA HOME  as stated above in   bash profile    mvn  command started working but  javac -version  command stopped working   When I typed  javac -version  command  I got the following error  Unable to locate an executable at   Library Java JavaVirtualMachines jdk1 8 0 45 jdk Contents Home jre bin javac   -1   Hence I rolled back my  JAVA HOME  to   Library Java JavaVirtualMachines jdk1 8 0 45 jdk Contents Home  in   bash profile  and added the following line at the top in  mvn  script  export JAVA HOME  Library Java JavaVirtualMachines jdk1 8 0 45 jdk Contents Home jre  Now both  mvn  and  javac  commands worked properly  but after careful observation of the mvn script  I could not make the difference between the following commands   Library Java JavaVirtualMachines jdk1 8 0 45 jdk Contents Home bin java -classpath  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 boot plexus-classworlds-2 6 0 jar -Dclassworlds conf  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 bin m2 conf -Dmaven home  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 -Dlibrary jansi path  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 lib jansi-native -Dmaven multiModuleProjectDirectory  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 bin org codehaus plexus classworlds launcher Launcher   Library Java JavaVirtualMachines jdk1 8 0 45 jdk Contents Home jre bin java -classpath  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 boot plexus-classworlds-2 6 0 jar -Dclassworlds conf  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 bin m2 conf -Dmaven home  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 -Dlibrary jansi path  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 lib jansi-native -Dmaven multiModuleProjectDirectory  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1 bin org codehaus plexus classworlds launcher Launcher  In the above the first command caused the following error   Error  Could not find or load main class org codehaus plexus classworlds launcher Launcher  while the second command worked fine  Please Note that both the above paths have  java  command while one is from  jre  the other is from  jdk   Other global variables are as following in   bash profile   export M2 HOME  Users venkatarajeevmandava Documents Maven apache-maven-3 6 1  export PATH  PATH  M2 HOME bin

User · Answer

For other people who might run into this  don t forget to check    mavenrc for M2 HOME or JAVA HOME settings

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Try to download binary zip  for ex  Maven 3 0 5  Binary zip   instead of complete source in official maven site  Also make sure that command line recognizes java and javac commands  I noticed that Maven Source zip didn t include any libraries at lib folder however Binary zip had them   in boot folder it had plexus-classworlds-2 4 jar  Perhaps the problem was with the absence of these libraries  Anyway it helped me so my M2 HOME is  C  Program Files Java apache-maven-3 0 5 and at PATH I put  C  Program Files Java apache-maven-3 0 5 bin

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Me too faced the similar issue  But in my case I used apache-maven-3 3 3-src folder in path variables  Later I corrected those with correct path of folder apache-maven-3 3 3-bin  This resolved the issue  Am not telling that is the same error reported here but this way also you can get this error and rectify it  That is what I am trying to say here

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I came across a similar problem on my mac OSX  After a series of trial and error attempts I finally resolved it   My    bash profile looked like this  export M2 HOME  Users xyz maven-3 x bin export PATH  PATH  M2 HOME   and when I tried to echo M2 HOME from the terminal  it showed me the correct path but when I tried to fire any maven command like mvn clean or mvn install  it always gave the same problem     Could not find or load main class org codehaus plexus classworlds launcher Launcher   I solved this issue by changing my M2 HOME to this  export M2 HOME  Users xyz maven-3 x export PATH  PATH  M2 HOME bin   And voila   It started working   Just by moving the position of  bin from M2 HOME to in front of the PATH

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It look like that you have installed Source files Because src only comes in Source Files and we don t need it   Try to install Binary Files from there  And then set environment variables as described there  This worked for me  And I am sure it will also work for you

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This worked for me    Remove all Mavin references in Environment Variables Download the Binary from mavin Unzip it to where you d like ex  C  apache-maven-3 6 0 Go to Environment variables and add to System variable path  C  apache-maven-3 6 0 bin  start command prompt as Administrator  check version with  mvn -v   CMD Result   Apache Maven 3 6 0  97c98ec64a1fdfee7767ce5ffb20918da4f719f3  2018-10-24T20 41 47 02 00  Maven home  C  apache-maven-3 6 0 bin

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Even though the question is answered I would like to add that  if you are getting the above mentioned error  be sure that you have downloaded the Binary file    The source file should only be downloaded if you are an advanced user and that you know how to deal with it    I have had quite a share of people downloading the wrong file  seniors and juniors

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This is a common issue while setting up Maven  All you need to do is the below  -   M2 HOME  - D  apache-maven-2 0 11       M2       - D  apache-maven-2 0 11 bin Path     - Append it with   M2    M2 HOME  amp  M2  - need to be declared as System variables and not as USER   ADMIN Variables   Path  - This can be the System Variable OR the USER   ADMIN variable  PATH   Preferably System Variable   Once you carefully do the setting of these 3 variable  you can verify Maven s installation as below   On CMD Prompt  -    C  Documents and Settings ADMIN mvn --version    Output  -    Apache Maven 2 0 11  r909250  2010-02-12 11 25 50 0530  Java version  1 6 0 22 Java home  C  Program Files Java jdk1 6 0 22 jre Default locale  en US  platform encoding  Cp1252 OS name   windows xp  version   5 1  arch   x86  Family   windows   Thanks

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Exactly the same error may appear even with correct environment variable settings  if you copy ONLY bin directory to the installation directory  It make which work finely  and novices get stuck

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I had this problem when I used Maven 3 5 4 on OpenJDK 11 on Ubuntu  The OpenJDK 11 on Ubuntu is actually still a JDK10     ls -al  etc alternatives java lrwxrwxrwx 1 root root 43 Aug 24 04 54  etc alternatives java - gt   usr lib jvm java-11-openjdk-amd64 bin java   java --version openjdk 10 0 2 2018-07-17 OpenJDK Runtime Environment  build 10 0 2 13-Ubuntu-1ubuntu0 18 04 3  OpenJDK 64-Bit Server VM  build 10 0 2 13-Ubuntu-1ubuntu0 18 04 3  mixed mode    I installed OpenJDK from Oracle into  opt jdk-11 0 1 and run Maven like this   JAVA HOME  opt jdk-11 0 1 mvn   It now works like a charm

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I think you download the wrong version  I meet this problem just now  no method work after searching and searching  Finally  I found that maven I downloaded is Source zip archive  After I change to Binary zip archive  everything go to be fine

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For most of the Maven setup issues something like  Could not find or load main class      start-with below steps to see if that fixes    Make sure you unzipped the right archive  BINARY archive and not SOURCE archive  Remove all user and system variables related to Maven  ex  M2 HOME M2 OPTS etc   Make sure JAVA HOME system variable is setup   ex   C  Program Files Java jdk1 8 0 172   Make sure java bin location is added in  path  system variable  ex    JAVA HOME  bin   Make sure maven bin location is added in  path  system variable  ex   C  MyInstalls apache-maven-3 5 4 bin     then      Verify java is setup  at commandprompt   java -version  Verify maven is setup  at commandprompt   mvn --version

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Besides what  khmarbaise has pointed out  I think you have mistyped your JAVA HOME   If you have installed in the default location  then there should be no  -   hyphen  between jdk and 1 7 0 04   So it would be  JAVA HOME C  Program Files Java jdk1 7 0 04

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

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