Maven Jar Builder: Could not find or load main class

Question

I have been trying for several days now to create an executable jar file for my muli-module maven project. However, when I try to run this jar file I get \"Could not find or

Answer 1

it seems like you have one of the plugins missing. add the bellow to pom.xml file

    org.apache.maven.plugins
    maven-jar-plugin
    2.6
    
            
                
                    true
                    yourclassnameKt
                
            
    

The plugin will add MANIFEST.mf file, which will tell the Java runtime which class to execute.

There is another issue that has the same problem -> Kotlin + Maven assembling: no main manifest attribute

Reference: https://michaelrice.com/2016/08/hello-world-with-kotlin-and-maven/