Could not find org.springframework.boot:spring-boot-dependencies:2.6.1 - spring-boot

Question

I follow the instructions here for the latest spring.framework.boot plugin.
My build.gradle has
plugins {
id 'java-library'
id 'eclipse'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'org.springframework.boot' version '2.6.2'
id 'org.springframework.boot.experimental.thin-launcher' version '1.0.23.RELEASE'
}
but gradle tasks have the error
> Could not resolve all dependencies for configuration ':detachedConfiguration1'.
> Could not find org.springframework.boot:spring-boot-dependencies:2.6.2.
UPDATE I neglected to add the final lines of the error description, which were in fact important to answer it.
Searched in the following locations:
- https://repo.spring.io/snapshot/org/springframework/boot/spring-boot-dependencies/2.6.2/spring-boot-dependencies-2.6.2.pom
- https://repo.spring.io/milestone/org/springframework/boot/spring-boot-dependencies/2.6.2/spring-boot-dependencies-2.6.2.pom

Answer 1

Here is a FULL file as an example: (this is the ROOT build.gradle) (If you code a monolith, you'll only have a root build.gradle, if you write multiple "gradle modules", you'll have a root and subproject build.gradle files) (if you have no idea what i'm talking about see link to docs.gradle.org at bottom)
(you can remove the dependencies, but i prefer to give a full working)
plugins {
id 'org.springframework.boot' version '2.6.2'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-actuator'
implementation 'org.springframework.boot:spring-boot-starter-batch'
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-data-ldap'
implementation 'org.springframework.boot:spring-boot-starter-integration'
implementation 'org.springframework.boot:spring-boot-starter-oauth2-client'
implementation 'org.springframework.boot:spring-boot-starter-oauth2-resource-server'
implementation 'org.springframework.boot:spring-boot-starter-security'
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.springframework.boot:spring-boot-starter-web-services'
implementation 'org.springframework.boot:spring-boot-starter-webflux'
developmentOnly 'org.springframework.boot:spring-boot-devtools'
implementation 'com.h2database:h2'
implementation 'mysql:mysql-connector-java'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
testImplementation 'io.projectreactor:reactor-test'
testImplementation 'org.springframework.batch:spring-batch-test'
testImplementation 'org.springframework.integration:spring-integration-test'
testImplementation 'org.springframework.security:spring-security-test'
}
test {
useJUnitPlatform()
}
allprojects {
/* custom task to show dependencies. run "gradle printAllDependencies" from commandline. see https://stackoverflow.com/questions/44266687/how-to-print-out-all-dependencies-in-a-gradle-multi-project-build/54436979#54436979 */
task printAllDependencies(type: DependencyReportTask) {}
}
Alternatively, you can try a "gradle FLUSH"
Gradle FLUSH Cache
(Optional, but preferred). Close all instances of IntelliJ or any other Java IDE.
./gradlew --stop
OR
gradle --stop
(now delete the folders)
rm -rf $HOME/.gradle/caches/
rm -rf $HOME/.gradle/build-cache-tmp/
(now resume normal gradlew commands like:)
./gradlew clean build
and alternatively, you can do an intelliJ "FLUSH"
(tested with IntelliJ version 2020.1 or later)
Close IntelliJ.
Delete the ".idea" folder off of the root folder.
Re OPEN the project.
Wait for Gradle imports and indices rebuild to complete
Try the IDE build again.
And the big hammer: "Invalidate IntelliJ caches". see https://www.jetbrains.com/help/rider/Cleaning_System_Cache.html and/or https://www.jetbrains.com/help/idea/invalidate-caches.html
If you're using Eclipse or NetBeans or Other, you'll have to find the "equivalent". The idea is that the IDE gets "confused".
BONUS
Multi Gradle Module :
https://docs.gradle.org/current/samples/sample_building_java_applications_multi_project.html

Answer 2

Thanks to #granadaCoder above, and after reinstalling Gradle to the latest version 7.3.3 the actual problem was that a 2nd repositories setting had crept into my build.gradle
repositories {
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
}
Which was exactly where the error said the dependencies were not found. I changed this to
repositories {
mavenCentral()
}
Things then started to work.