diff --git a/Jenkinsfile b/Jenkinsfile
index 6f3a902..2f86ca1 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -16,6 +16,8 @@ node('docker') {
             withCredentials([file(credentialsId: gpg_cred_id, variable: 'GPG_KEYS')]) {
                 sh 'gpg --version'
                 sh 'gpg --keyring=pubring.gpg --no-default-keyring --import $GPG_KEYS || true'
+                sh 'java --version'
+                sh 'ls /tmp'
             }
         }