Spring Cloud Config Cannot override server.port with JVM parameter in Spring Cloud Client

Application server port cannot be overridden by JVM parameter -Dserver.port if the property is present in Spring Cloud Config. I'm using Spring cloud Greenwich.SR3 version and Spring Boot 2.1.9.RELEASE

The sample application could look like this

@SpringBootApplication
public class RandomPortApplication {

    public static void main(String[] args) {
        SpringApplication.run(RandomPortApplication.class, args);
    }

}

with bootstrap.yml like

spring:
  application:
    name: random-port
  cloud:
    config:
      discovery:
        enabled: true

and with the pom.xml

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-dependencies</artifactId>
      <version>Greenwich.SR3</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-config</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
  </dependency>
</dependencies>

<build>
  <resources>
    <!-- make sure that configs are not packaged and read them from Cloud Config Server -->
    <resource>
      <directory>src/main/resources</directory>
      <excludes>
        <exclude>application*</exclude>
      </excludes>
    </resource>
  </resources>

  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
    </plugin>
  </plugins>
</build>

This requires Eureka server running with default config and Cloud Config server having the following application.yml for our service

server:
  port: 0

If I run such service with

mvn spring-boot:run -Dserver.port=7777 -Deureka.client.serviceUrl.defaultZone="http://localhost:8761/eureka/"

The service uses random port instead of the provided one!

The things that I notice - if I move server.port=0 to bootstrap.yml, the port can be overridden - or if I add dependency org.springframework.cloud:spring-cloud-config-server (although does not make sense to have this dependency) it works fine, I can override the port

Comment From: spencergibb

Try setting spring.cloud.config.override-system-properties=true. See https://cloud.spring.io/spring-cloud-static/Hoxton.RELEASE/reference/html/spring-cloud-hoxton-configprops.html

Comment From: dome313

Hello @spencergibb tried with override-system-properties and also doesn't work. I created a sample repo here: https://github.com/dome313/random-port with only Cloud Client and Cloud Config Server which shows that is not possible to override port with JVM property -Dserver.port

Comment From: spencergibb

spring.cloud.config.override-system-properties=true needs to be in a property source returned from config server.

Comment From: dome313

Adding

spring:
  cloud:
    config:
      override-system-properties: false

to a property source returned from config server did the trick. I updated my git repo to reflect that.

Thanks @spencergibb. You can close the ticket.