server/minecraft: Allowed global defining of java version

roles/server/minecraft/defaults/main.yml

@@ -16,6 +16,7 @@ minecraft_source_link: "{{ lookup('pipe', minecraft_source_link_generator) }}" #
 minecraft_port: "25565"
 minecraft_rcon_port: "25575"
 minecraft_rcon_password: "{{ lookup('password', 'credentials/' + inventory_hostname + '/' + domain + '/rcon length=80') }}"
+java_version: 11
 minecraft_start_ram: "1G"
 minecraft_max_ram: "1G"
 minecraft_difficulty: "normal"

roles/server/minecraft/tasks/main.yml

@@ -4,7 +4,7 @@
   apt:
     state: present
     name:
-      - openjdk-11-jre-headless
+      - openjdk-{{ java_version }}-jre-headless
 
 - name: Create required read only directories
   file:

roles/server/minecraft/templates/minecraft.service

@@ -19,5 +19,5 @@ InaccessibleDirectories=/root /sys /srv -/opt /media -/lost+found
 ReadOnlyDirectories={{ installation_directory }}
 ReadWriteDirectories={{ data_directory }}
 WorkingDirectory={{ data_directory }}
-ExecStart=/usr/lib/jvm/java-11-openjdk-amd64/bin/java -Xms{{ minecraft_start_ram | quote }} -Xmx{{ minecraft_max_ram | quote }} -jar {{ installation_directory | quote }}/server.jar nogui
+ExecStart=/usr/lib/jvm/java-{{ java_version }}-openjdk-amd64/bin/java -Xms{{ minecraft_start_ram | quote }} -Xmx{{ minecraft_max_ram | quote }} -jar {{ installation_directory | quote }}/server.jar nogui
 ExecStop={{ remote_control_script }} stop