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Incase ${env.property_name} doesnot work try by removing env.
Example:
spring.data.mongodb.database=${env.MONGO_DATABASE} didnot work
--> use spring.data.mongodb.database=${MONGO_DATABASE}
note: you already had this dependency in your pom.xml for dotenv
<dependency>
<groupId>me.paulschwarz</groupId>
<artifactId>spring-dotenv</artifactId>
</dependency>