Add a "JSONified" error management.

src/main/resources/application.yml

@@ -21,6 +21,9 @@ logging:
 
 server:
 #  use-forward-headers=true
+  error:
+    whitelabel:
+      enabled: false # Disable html error responses.
   port: 8080
 #  ssl:
 #    key-store: /home/takiguchi/Developpement/Java/codiki/keystore.p12