diff --git a/defaults/main.yml b/defaults/main.yml
index a59a38b..f808902 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -4,8 +4,8 @@ springboot_java_install: true
 
 # Mandatory variable : path to springboot jar to deploy.
 # Either specify a file or a url depending on if you want to copy you app or download it.
-springboot_src_file:
-springboot_src_url: None
+springboot_src_file: ''
+springboot_src_url: ''
 
 # Mandatory variable : spring boot application name
 springboot_application_name:
diff --git a/tasks/service.yml b/tasks/service.yml
index f9e3cb0..eebd8b0 100644
--- a/tasks/service.yml
+++ b/tasks/service.yml
@@ -1,6 +1,6 @@
 ---
 - name: "Check if use systemd"
-  set_fact: use_system_d={{(ansible_distribution == 'Debian' and ansible_distribution_version | version_compare('8', '>=')) or (ansible_distribution in ['RedHat','CentOS'] and ansible_distribution_version | version_compare('7', '>=')) or (ansible_distribution == 'Ubuntu' and ansible_distribution_version | version_compare('15', '>=')) }}
+  set_fact: use_system_d={{(ansible_distribution == 'Debian' and ansible_distribution_version is version('8', '>=')) or (ansible_distribution in ['RedHat','CentOS'] and ansible_distribution_version is version('7', '>=')) or (ansible_distribution == 'Ubuntu' and ansible_distribution_version is version('15', '>=')) }}
 
 - name: "Ensure systemd system directory is present (for Ubuntu)"
   file: