gitlab CI/CD with maven doesn’t setup environment variables in application.properties

I am trying to build CI/CD pipeline with maven. Problem that I meet is that in application.properties I set variables like that:

database.MongoPass=${MONGO_PASS}
database.Secret=${SECRET}
database.connectionString=${ATLAS_STRING}
spring.data.mongodb.uri=${ATLAS_STRING}

and I cannot setup them it gitlab. Every time if gitlab will build package all time I cannot run it because connection string is wrong I get error: “The connection string is invalid. Connection strings must start with either ‘mongodb://’ or ‘mongodb+srv://”

here example of variable that I set up in gitlab CI/CD settings

and here code that I tried run in gitlab CI/CD echo works correct and show correct variable value each mvn script I tried didn’t work

 script:
    - echo $SECRET
    - echo $MONGO_PASS
    - echo $ATLAS_STRING
    - mvn install -B #  (I hope that application properties automatically get variables from gitlab env) 
    - mvn -DSECRET=$SECRET -DMONGO_PASS=$MONGO_PASS -DATLAS_STRING=$ATLAS_STRING clean install -B #  (I found this solution on stack) 
    - mvn -Dspring-boot.run.arguments=--database.Secret=$SECRET,--database.MongoPass=$MONGO_PASS,--spring.data.mongodb.uri=$ATLAS_STRING clean install -B #  (if I change here env variables for normal string it wont't build on gitlab)

I don’t have idea what I should do with that I don’t want have variables saved in my repo and don’t have idea what toDo with that. Could someone give me advice ? mvn script builds jar file in artifacts after each run I download it and run to test it with command

java -jar filename.jar

Update: I made small investigation and make class to test variables after spring startup:

  @PostConstruct
    public void test() {
        log.info("VARIABLES TEST");
        log.info("properties.getSecret(): {}", properties.getSecret());
        log.info("properties.getConnectionString(): {}", properties.getConnectionString());
        log.info("properties.getMongoPass(): {}", properties.getMongoPass());
    }

and variables are all time not set:

properties.getSecret(): ${SECRET}
properties.getConnectionString(): ${ATLAS_STRING}
properties.getMongoPass(): ${MONGO_PASS}

gitlab-ci.yml:

image: maven:3.8.1-jdk-11

build_artifact:
  stage: build
  script:
    - export
#    - mvn install -B -P no-tests
    - mvn -DSECRET=$SECRET -DMONGO_PASS=$MONGO_PASS -DATLAS_STRING=$ATLAS_STRING clean install -B -P no-tests #  (I found this solution on stack)
#    - mvn -Dspring-boot.run.arguments=--database.Secret=$SECRET,--database.MongoPass=$MONGO_PASS,--spring.data.mongodb.uri=$ATLAS_STRING clean install -B -P no-tests #  (if I change here env variables for normal string it wont't build on gitlab)
  artifacts:
    paths:
      - target/*.jar
    expire_in: 10 minutes

Example pipeline result:

Running with gitlab-runner 14.4.0-rc1 (bc99a056)
  on docker-auto-scale ed2dce3a
Preparing the "docker+machine" executor
00:23
Using Docker executor with image maven:3.8.1-jdk-11 ...
Pulling docker image maven:3.8.1-jdk-11 ...
Using docker image sha256:5b508b1fe19e290255c9e077a1c7af028a576cabb70eab4abdfee574599f729f for maven:3.8.1-jdk-11 with digest maven@sha256:aaf506d47cd2ec8f62fc1ff74065eda5614738e8ea61bad9b32da0360b9498cd ...
Preparing environment
00:01
Running on runner-ed2dce3a-project-16772800-concurrent-0 via runner-ed2dce3a-srm-1634103033-dfd4e8e6...
Getting source from Git repository
00:03
$ eval "$CI_PRE_CLONE_SCRIPT"
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/**/***/.git/
Created fresh repository.
Checking out 60bf3869 as feature/branch
Skipping Git submodules setup
Executing "step_script" stage of the job script
$ mvn -DSECRET=$SECRET -DMONGO_PASS=$MONGO_PASS -DATLAS_STRING=$ATLAS_STRING clean install -B -P no-tests
***
Downloading all dependencies 
***
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  01:00 min
[INFO] Finished at: 2021-10-13T05:34:25Z
[INFO] ------------------------------------------------------------------------
Uploading artifacts for successful job
00:07
Uploading artifacts...
target/*.jar: found 1 matching files and directories 
Uploading artifacts as "archive" to coordinator... ok  id=1674250996 responseStatus=201 Created token=z2qnoeL8
Cleaning up project directory and file based variables
00:00
Job succeeded

Answer

Educated guess: you haven’t enabled maven filtering for your application.properties property file.

Without filtering, those placeholders won’t be replaced.

So have something like this in your pom file:

<project>
  ...
  <build>
    ...
    <resources>
      <resource>
        <directory>src/main/resources</directory>
        <filtering>true</filtering>
      </resource>
      ...
    </resources>
    ...
  </build>
  ...
</project>

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Answer