CODEWITHSUNDEEP
javalinuxmavenclassnotfoundexception
Bujaka
Bujaka

Reputation: 105

Maven: mvn --version java.lang.ClassNotFoundException

I have just installed new Maven into my new Fedora 17 64bit.

Details:

java -version

java version "1.6.0_32"
Java(TM) SE Runtime Environment (build 1.6.0_32-b05)
Java HotSpot(TM) 64-Bit Server VM (build 20.7-b02, mixed mode)

javac -version

javac 1.6.0_32

echo $JAVA_HOME

/usr/java/jdk1.6.0_32

echo $JRE_HOME 

/usr/java/jdk1.6.0_32/jre

echo $M2_HOME 

/usr/local/maven/apache-maven-3.0.4

echo $M2

/usr/local/maven/apache-maven-3.0.4/bin

echo $PATH 

/usr/local/maven/apache-maven-3.0.4/bin:/usr/local/bin:/usr/bin:/bin:/usr/games:/usr/local/sbin:/usr/sbin:/usr/java/jdk1.6.0_32/bin:/home/bujaka/.local/bin:/home/bujaka/bin

which mvn

/usr/local/maven/apache-maven-3.0.4/bin/mvn

But mvn -version throws java.lang.ClassNotFoundException.

java.lang.ClassNotFoundException: org.apache.maven.cli.MavenCli
    at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.getMainClass(Launcher.java:145)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:267)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)                                                    
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)                                          
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)

P.S. I installed maven from apache site (not from fedora repos)

Upvotes: 2

Views: 12901

Answers (5)

Emanuel Martinez Vazquez
Emanuel Martinez Vazquez

Reputation: 1

I had the same issue in my Windows where tried to install the latest maven version and it cause the same class not found exception. I suspect it had something to do with a dependency missing from the /lib directory. I had to install the previous stable release instead of the latest release and that solved the issue for me.

Upvotes: 0

ganesh parajuli
ganesh parajuli

Reputation: 167

Best solution for this issue: Go to maven official site i.e https://maven.apache.org/download.cgi and download latest Apache maven. (Make sure you download Binary zip archive for windows user specially)

and set SYSTEM environment variable as:

MAVEN_HOME      C:\Program Files (x86)\apache-maven-3.8.6

path            %MAVEN_HOME%\bin

Upvotes: 0

James Dunn
James Dunn

Reputation: 8264

I just came across this same issue. Bujaka's comment and Peter Butkovic's answer get at the issue, but for the record here's my take on it and the solution I used.

I don't know what causes this, but sometimes the entire content of the /lib folder in your maven installation directory can become empty. This may be the case when you get this error.

If you check your /lib folder and find that it is not empty, it is still possible (although unlikely) that a crucial file somehow got deleted.

If your maven installation used to work find and only started acting up recently, then the zipped archive you used was probably fine. Here's what to do:

  1. Rename your installation directory (or if you're brave, just delete it).
  2. Get the original zipped archive. (If you're like me, it's still somewhere in your increasingly cluttered downloads folder. If not you'll have to re-download it.)
  3. Unzip said archive into the location of your original installation directory (which you either renamed or deleted).

Your maven installation should now work again.

Upvotes: 1

Peter Butkovic
Peter Butkovic

Reputation: 12139

thanks user1436170, your last comment did the job for me as well: 

/lib catalog was empty in maven.tar.gz archive.

When opening via krusader, lib folder in tar.gz file it was empty, but it contains jars when opening via ark.

Anyway zip works.

Upvotes: 4

Keerthiram Murugesan
Keerthiram Murugesan

Reputation: 443

MavenCli class is in maven-embedder. Are you behind a proxy?

  <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                      http://maven.apache.org/xsd/settings-1.0.0.xsd">
  ...
  <proxies>
    <proxy>
      <id>myproxy</id>
      <active>true</active>
      <protocol>http</protocol>
      <host>proxy.somewhere.com</host>
      <port>8080</port>
      <username>proxyuser</username>
      <password>somepassword</password>
      <nonProxyHosts>*.google.com|ibiblio.org</nonProxyHosts>
    </proxy>
  </proxies>
  ...
</settings>

@See Maven Proxy Settings

Upvotes: 0

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