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For security reasons, I have to store the passwords in an external application.yml (outside the war), which should be loaded by the deployed war on runtime.

Do you know where do I have to place the external configuration file? Do I have to configure some properties?

Thank you in advance!

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I assume you have a war file which contains a spring-boot application, in general there are more options to manage your properties, check out the document here: https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html

I will recommend you 2 different approaches:

  1. Set your properties as environment variables, there is much easier way to manage properties if you have a separate container for your application.
  2. Otherwise spring provides you the possibility to override properties using commandline argument, you can do something like: java -jar myproject.war --spring.config.location=file:/default.properties
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Should it be an application.properties file? Or can I also use application.yml? I tried overried the property but this is not working: -Dspring.config.location=file:D:\tomcat\..\webapps\application-develop.yml
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If you want to store confidential data in the server, then please add <Environment> to the context.xml file of tomcat server. Example: <Environment name="user.password" value="XXXXXXXX" type="java.lang.String" override="false"/>. You can access them as properties in spring context.

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