How to publish a WAR file to maven (Nexus) repository with Jenkins via Gradle task - jenkins

Question

I'm struggling with deploying the war file to Nexus repository using Jenkinsfile via Gradle task.
The war is being created successfully. I have also no problem with deploying JARs (since there are examples everywhere how to do it).
So I have this publishing section in my build.grade:
publishing {
repositories {
maven {
URI releasesUrl = new URI("${UploadURL}/repository/releases")
URI snapshotsUrl = new URI("${UploadURL}/repository/snapshots")
afterEvaluate {
url version.endsWith("SNAPSHOT") ? snapshotsUrl : releasesUrl
}
credentials {
username "${user}"
password "${password}"
}
}
}
publications {
mavenWeb(MavenPublication) {
from components.web
artifact war.archivePath
}
}
}
With pluggins:
apply plugin: 'java'
apply plugin: 'maven'
apply plugin: 'maven-publish'
apply plugin: 'org.springframework.boot'
apply plugin: 'war'
The URL for repositories is also specified in the build script correctly (test publish with the jar works just fine)
And the Jenkinsfile:
stage ('Publish war') {
steps {
sh "sh gradlew publish"
}
}
Currently I'm getting this error from jenkins build:
Task :publishMavenWebPublicationToMavenRepository FAILED
FAILURE: Build failed with an exception.
What went wrong:
Execution failed for task ':publishMavenWebPublicationToMavenRepository'.
Failed to publish publication 'mavenWeb' to repository 'maven'
Invalid publication 'mavenWeb': multiple artifacts with the identical extension and classifier ('war', 'null').
I'm quite sure that the problem is within "publications" part of Gradle task.
For publishing the Jars I have been using it like this:
[...]
publications {
mavenJava(MavenPublication) {
from components.java
artifact sourceJar
}
}
[...]
task sourceJar(type: Jar) {
classifier 'sources'
from sourceSets.main.java
}
I do not know how to configure from, artifact and classifier for this task. I do not even know if all of these parameters should be configured... Could anyone help me with that?

Answer 1

It turned out, that the origin of the problem was this section:
afterEvaluate {
url version.endsWith("SNAPSHOT") ? snapshotsUrl : releasesUrl
}
This feature works with Gradle 5.X version however, I was using Gradle 4.8. That lead to null instead of propper url value...
Unfortunately, it took a while since the exception message does not suggest where the problem was.