log4j2 java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager

Question

I am using log4j 2.3 in my java application. I added the dependency via maven.
When running the program in eclipse everything work fine, but when I package it with maven and

Answer 1

When you are running your application jar from command line your dependent jar are not available at runtime. You need to include any of these two plugins to pom.xml so have your dependencies available at runtime.

Using: maven-shade-plugin

        org.apache.maven.plugins
        maven-shade-plugin
        2.4.1
        
          
            package
            
              shade
            
            
              
                
                  org.sonatype.haven.HavenCli
                
              
            
          
        
      

Using:maven-dependency-plugin

    org.apache.maven.plugins
    maven-dependency-plugin
    2.8
    
        
             copy-dependencies
             package
             
                 copy-dependencies
             
             
                 ${project.build.directory}/lib
             
        
     

When you will execute the mvn package it will generate uber jar / or copy the dependencies to outputDirectory. I will prefer maven-shade-plugin to generate one jar will all dependencies.