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

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?

Przemysław Gęsieniec Przemysław Gęsieniec · Accepted Answer · 2019-08-26T05:29:13

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.

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

1 Answers