code: private void addLibsJarsToClassPath( UnpackedLibHelper helper, MavenProject project, Artifact artifact )
          throws MavenExecutionException
      {
           try
           {
               final File unpackLibFolder = helper.getUnpackedLibFolder( artifact );
               final File artifactFile = helper.getArtifactToFile( artifact );
               ZipFile zipFile = new ZipFile( artifactFile );
               Enumeration enumeration = zipFile.entries();
               while ( enumeration.hasMoreElements() )
               {
                   ZipEntry entry = ( ZipEntry )  enumeration.nextElement();
                   String entryName = entry.getName();
  
                   // Only jar files under 'libs' directory to be processed.
                   if ( Pattern.matches( "^libs/.+\\.jar$", entryName ) )
                   {
                       final File libsJarFile = new File( unpackLibFolder, entryName );
                       log.warn( "Adding jar from libs folder to classpath: " + libsJarFile );
  
                       // In order to satisfy the LifecycleDependencyResolver on execution up to a phase that
                       // has a Mojo requiring dependency resolution I need to create a dummy classesJar here.
                       if ( !libsJarFile.getParentFile().exists() )
                       {
                           libsJarFile.getParentFile().mkdirs();
                       }
                       libsJarFile.createNewFile();
  
                       // Add the jar to the classpath.
                       final Dependency dependency =
                              createSystemScopeDependency( artifact, libsJarFile, libsJarFile.getName() );
  
                       project.getModel().addDependency( dependency );
                       addedJarFromLibs = true;
                   }
               }
           }
           catch ( MojoExecutionException e )
           {
               log.debug( "Error extract jars" );
           }
           catch ( ZipException e )
           {
               log.debug( "Error" );
           }
           catch ( IOException e )
           {
               log.debug( "Error" );
           }
      }
docs: Add jar files in libs into the project classpath.