What does a correct Gradle configuration look like in a multi-module project that uses the Gradle plugins spring-boot-dependencies
and spring-boot
?
I have the following project setup:
parent
|
+ build.gradle
|
+ alpha
| |
| + build.gradle
|
+ beta
| |
| + build.gradle
parent
module contains common project configuration.alpha
module is a module in which I would like to import dependencies using versions numbers specified in the spring-boot-dependencies bom, but the result of the is a standard jar.beta
module is a module that depends on alpha
and the result is an executable Spring Boot jar file (including all dependencies). Consequently, this project needs both the spring-boot-dependencies
as well as the spring-boot
plugin.In order to keep the Gradle files DRY, I have extracted common module scripts to the parent's build.gradle
file.
Attempts to execute $ gradle build
using the project configuration below results in:
> Plugin with id 'io.spring.dependency-management' not found.
parent gradle.build
allprojects {
group = "com.example"
version '0.0.1-SNAPSHOT'
ext {
dependencyManagementPluginVersion = '0.5.3.RELEASE'
springBootVersion = '1.3.0.RC1'
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
}
subprojects {
sourceCompatibility = 1.8
targetCompatibility = 1.8
buildscript {
repositories {
jcenter()
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
}
dependencies {
classpath("io.spring.gradle:dependency-management-plugin:${dependencyManagementPluginVersion}")
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'io.spring.dependency-management'
dependencyManagement {
imports {
mavenBom("org.springframework.boot:spring-boot-dependencies:${springBootVersion}")
// mavenBom("org.springframework.boot:spring-boot-starter-parent:${springBootVersion}")
}
}
}
alpha build.gradle
dependencies {
compile('org.springframework:spring-web')
}
beta gradle.build
apply plugin: 'spring-boot'
dependencies {
compile project(':alpha')
compile('org.springframework.boot:spring-boot-starter')
compile('org.springframework.boot:spring-boot-starter-web')
}
Comments:
spring-boot
plugin was changed in Spring Boot 1.3.0.M1It turns out that parent/build.gradle
should be rearranged in the following way:
buildscript {
ext {
dependencyManagementPluginVersion = '0.5.3.RELEASE'
springBootVersion = '1.3.0.RC1'
}
repositories {
jcenter()
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
}
dependencies {
classpath("io.spring.gradle:dependency-management-plugin:${dependencyManagementPluginVersion}")
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
allprojects {
group = "com.example"
version '0.0.1-SNAPSHOT'
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
}
subprojects {
sourceCompatibility = 1.8
targetCompatibility = 1.8
apply plugin: 'io.spring.dependency-management'
dependencyManagement {
imports {
mavenBom("org.springframework.boot:spring-boot-dependencies:${springBootVersion}")
// mavenBom("org.springframework.boot:spring-boot-starter-parent:${springBootVersion}")
}
}
}
The problem lies in the fact that buildscript
block for subprojects was indeed configured well but... in a wrong place. This subprojects
block relates to subprojects but it will be evaluated in the script it was declared, and there were no dependencies declared for the plugin it was trying to apply.