Gradle 5 JUnit BOM and Spring Boot Incorrect Versions

How do I disable JUnit coming from the Gradle Spring Dependency Management plugin?

For starters, if you are using the dependency management plugin from Spring, you should not be importing the junit-bom since that results in duplicate (and potentially conflicting) management of those dependencies.

Aside from that, whenever you use the dependency management plugin from Spring and want to override a managed version, you have to do it by overriding the exact name of the version defined in the BOM used by the plugin.

This is documented in Spring Boot for Gradle and for Maven.

For Spring Boot the name of the JUnit Jupiter version is "junit-jupiter.version". You can find the names of all managed versions for Spring Boot 2.1.2 here.

So, in Gradle you would override it as follows.

ext['junit-jupiter.version'] = '5.4.0'.

You can see that I have done exactly that here.

With Maven you would override it as follows.

<properties>
    <junit-jupiter.version>5.4.0</junit-jupiter.version>
</properties>

Further background information here: https://docs.spring.io/platform/docs/current/reference/html/getting-started-overriding-versions.html

JUnit 5.4.0 simplified its artifacts, and now delivered a single artifact for Jupiter - org.junit:junit-jupiter. I.e., you should simplify your Gradle file too:

testImplementation(enforcedPlatform("org.junit:junit-bom:5.4.0")) // JUnit 5 BOM
testImplementation("org.junit.jupiter:junit-jupiter")