Pass credentials to maven from Jenkins

Question

I have a node running Jenkins that builds code with maven. The Jenkins job is a declarative pipeline script. Maven needs to download dependencies from private repositories which require credentials to access. The credentials are stored in the Jenkins credential manager.

How can I pass these credentials to maven so that maven can correctly download dependencies from private repos using these credentials.

Answer 1

By injecting Jenkins credentials into your environment, and then passing those credentials to maven, you can access private repos using Jenkins credentials.

Steps:

1. Create a new pair of Jenkins credentials if you haven't already (I am using the id "test-creds")
2. Using the instructions from this question : How to pass Maven settings via environmental vars. Around the maven command that requires the credentials, use a "withCredentials" block. And then pass those credentials in to maven.

    withCredentials([usernamePassword(credentialsId: 'test-creds', passwordVariable: 'PASSWORD_VAR', usernameVariable: 'USERNAME_VAR')])
    {
        sh 'mvn clean install -Dserver.username=${USERNAME_VAR} -Dserver.password=${PASSWORD_VAR}'
    }

3. In your settings.xml file, reference these variables:

    <servers>
        <server>
            <id>ServerID</id>
            <username>${server.username}</username>
            <password>${server.password}</password>
        </server>
    </servers>

4. If you need to specify a settings.xml file, you can use the -s or -gs flag in your maven command.