Unresolvable placeholder in the value of `spring.datasource.url` causes a startup failure even when there is a user-provided DataSource bean

[fedelopez]

I have an application.yml config file in a Spring Boot 2.2.4 app with the following entry:

spring.datasource.url: ${DATA_SOURCE_URL}

DATA_SOURCE_URL is available only when running the app locally, not in the cloud.

In the cloud (Pivotal Cloud Foundry) we have a PostgreSQL service that injects the data source connection properties automatically using Spring Cloud Connectors. This work perfectly in 2.2.4.

When bumping up the Spring Boot version to 2.2.5 the app won't start:

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'DATA_SOURCE_URL' in value "${DATA_SOURCE_URL}"

[wilkinsona]

@fedelopez Thanks for the report. Could you please try with a 2.2.6 snapshot (available from https://repo.spring.io/snapshot). I am wondering if the problem that you are seeing is a duplicate of #20432.

[fedelopez]

I've tried with version 2.2.6.BUILD-SNAPSHOT from the snapshot repo but I still get the same error.

Only works when I revert back to 2.2.4.RELEASE.

[wilkinsona]

Thanks for trying out a 2.2.6 snapshot. Can you please share a small sample that reproduces the problem so that we can investigate further?

[spring-projects-issues]

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[fedelopez]

You can try this repo. If you push it to Pivotal Web Services will not work with 2.2.5 and 2.2.6.BUILD-SNAPSHOT: https://github.com/fedelopez/spring-boot-issue-20438