Getting “java.lang.NoClassDefFoundError: com/beust/jcommander/ParameterException”Exception

Question

I wanted to invoke testng programmatically. Not eclipse plug-in.

I have associated \"testng-6.8.21.jar\" and running through eclipse and i ran below code:

Answer 1

As @sgrillon correctly pointed out, you need the correct Maven dependency, but also the shade plugin (https://maven.apache.org/plugins/maven-shade-plugin) to package a Uber-jar including all Maven dependencies for easy execution. This is what should be included in your pom.xml:

...
  
    
      com.beust
      jcommander
      1.48
    
  
...
    
      ...
      
        maven-compiler-plugin
        3.1
        
          1.8
          1.8
        
      

      
        org.apache.maven.plugins
        maven-shade-plugin
        2.3
        
          
            package
            
              shade
            
            
              true
              runnable
            
          
        
      

    

After you build the Maven package, you'll get your regular my-app-1.0-SNAPSHOT.jar file and also a my-app-1.0-SNAPSHOT-runnable.jar. This is what you should run, with the command:

$ java -jar my-app-1.0-SNAPSHOT-runnable.jar

You can verify with this command:

$ jar tvf my-app-1.0-SNAPSHOT-runnable.jar

that the shaded jar contains the JCommander classes (and those of all the other Maven dependencies), while the regular one doesn't.