How can I use a dependencyManagement version with a classifier with Spring's Gradle dependency management plugin? - spring

Question

Per dependency-management-plugin#67, a classifier cannot be specified within the dependencySet block. This limitation is discussed in a related question (Is it possible to set a dependencySet entry's classifier using Spring's Gradle dependency management plugin).
dependencyManagement {
dependencies {
dependencySet(group:'com.querydsl', version: '4.2.2') {
entry 'querydsl-apt' // This needs to use the "general" classifier
entry 'querydsl-mongodb'
}
}
}
dependencies {
annotationProcessor 'com.querydsl:querydsl-apt:4.2.2:general' // Version needed to use a classifier
implementation 'com.querydsl:querydsl-mongodb'
}
One workaround to this limitation would be to use an ext block, and define a version variable:
ext {
querydslVersion = 4.2.2
}
dependencyManagement {
dependencies {
dependencySet(group:'com.querydsl', version: querydslVersion) {
entry 'querydsl-mongodb'
}
}
}
dependencies {
annotationProcessor "com.querydsl:querydsl-apt:$querydslVersion:general" // Version needed to use a classifier
implementation 'com.querydsl:querydsl-mongodb'
}
A downside to this approach are that it requires setting a property that wouldn't otherwise be set (and might need to be made available between modules in a multi-module plugin, making the build less obvious). It also doesn't work particularly well if the dependency version is transitively pulled in via a BOM (e.g. imports { mavenBom 'org.springframework.boot:spring-boot-dependencies:2.3.1.RELEASE'}, since that requires manually keeping the version in sync with the BOM's value.
Is there still a way to use the version defined in the dependency management section, despite this limitation?

Answer 1

The Spring Dependency Management Plugin gives programmatic access to the managed versions by way of the managedVersions map. This can be used to get the dependency version of the artifact, which can be used to specify the version to use:
dependencies {
annotationProcessor "com.querydsl:querydsl-apt:${dependencyManagement.managedVersions['com.querydsl:querydsl-apt']}:general"
implementation 'com.querydsl:querydsl-mongodb'
}