If multiple SNAPSHOT artifact are specified:

 nexusArtifactUploader (
  artifacts: [

   [artifactId: "foo", file: "target/foo-1.0-SNAPSHOT.jar", type: "jar"],

   [artifactId: "foo", file: "target/foo-1.0-SNAPSHOT.pom", type: "pom"]

  ],
 credentialsId: 'ci-deploy-nexus', 
 groupId: "${group}", 
 nexusUrl: "${nexusUrl}",
 nexusVersion: 'nexus3',
 protocol: 'https',
 repository: "snapshots",
 version: "${version}"
}

Two snapshot version are created (one for the pom artifact and one for the jar artifact)