Jenkins needs to know where your Maven is installed - maven

Jenkins runs into error while locating "maven" folder, for Maven type project:
Jenkins needs to know where your Maven is installed. Please do so from the system configuration.
Just about the place where pom.xml location is to be mentioned.

As stated in the above answer, you need to set-up maven in Global Tool Configuration. Name your Maven & check the install automatically option. Jenkins will automatically install Maven before building the project

As mentioned in Bug JENKINS-34743, you need to set Maven Location in Global Tool Configuration = Jenkins initial page > Manage Jenkins > Global Tool Configuration

Related

Unable to configure Maven in Jenkins 2.7.2

I am unable to configure Maven in Jenkins version 2.7.2
When trying to configure from Configure Systems in Manage Jenkins, unable to understand where to add Maven repository path.
Configure Systems screenshot
Go to Jenkins / Manage Jenkins / Global Tool Configuration and add a Maven installation, either pointing to an existing directory or installing a new one.

Configure Maven installation in Jenkins per individual job

Is there a way to configure Jenkins to use specific Maven installation per job?
e.g.
Job A - Maven 3.3.3
Job B - Maven 3.3.9
Jenkins allows you to select which Maven installation to use per job. You can setup multiple installations of Maven, multiple settings configurations of Maven to be exact, through Manage Jenkins → Configure System.
Then to configure per job, in Jenkins, select your specific build job and choose Configure. From there, assuming it is a Maven project build, you should have option(s) under the Build section (might have to hit the Advanced button) where you can select the Maven settings for your installation you want.
khmarbaise's comment is very valid, though. Unless you have a very specific reason to downgrade Maven for a given job, your build shouldn't be too reliant on what minor versions of the build tool to use.
For newer Jenkins versions, management of Maven installations is placed here:
Manage Jenkins → Global Tool Configuration → section Maven.
Per job configuration: "Maven Version" dropdown placed in "Build" section.

How to run a maven plugin without a POM in Jenkins?

I have a plugin which can run either using a pom.xml or without (depends upon the version of the artifact we're building: new versions go without a pom. Strange, I know).
I want to have that plugin run in Jenkins.
But when creating a maven project, I have to set a pom (or as a default, Jenkins suppose there is one in the base folder given).
Question: Is it possible to configure Jenkins to not use a pom when there is none?
As per my comment, you should use a Jenkins freestyle project build in this case, in order to have more flexibility and avoid the default assumptions of a Jenkins Maven build.
In such a build, you can then configure a build step executing a shell or a Windows command (depending on the Jenkins server OS).
Indeed, in the Jenkins Maven build, a pom file is always required, as mentioned in the help support of the Configuration > Build > Root Pom entry
If your workspace has the top-level pom.xml in somewhere other than the 1st module's root directory, specify the path (relative to the module root) here, such as parent/pom.xml.
If left empty, defaults to pom.xml

Do we have to include jar files in eclipse project if we are using maven?

I am new to maven.
The POM file in maven contains all the dependencies that we need in our project.
So we don't have to externally add any JAR's to the buildpath in eclipse.Right?
That's right. Maven will download dependencies and M2Eclipse (Eclipse plugin for integrating Eclipse with Maven) will setup a build path for you.
Two Solutions - 1 Using Eclipse IDE
Install the Maven (M2E Eclipse Plugin) if you use older version of eclipse, If you download the latest eclipse.
Point your settings.xml and create a maven project from your eclipse, it is better keep Group Id as com.yourcompany.app Artifact Id as yourProjectName and Version 0.0.1-SNAPSHOT depends on your Architecture Standards set by your company. Also Packaging can be as WAR file for WebApplication, EAR file for Enterprise Application. You can find the numerous list of examples from Maven Site.
2 From Command Line
Install Maven from Apache Maven site, Would recommend to go for the latest version -apache-maven-3.3.9-bin.zip.
Set the Maven Home in the Environment Variables as shown in the below figure.
Edit Your Path variable as %MAVEN_HOME%\bin, verify your installation by using this command from your command prompt. It should display the Maven Home and Java Version, which confirms your maven successful installation.
Paste your settings.xml (C:\apache-maven-3.3.9\conf) given by your build team or Architecture team for accessing your internal repository. And keep a backup of the original settings.xml (which is default download from Maven site)
Run these commands from your command prompt.
mvn eclipse:clean -e
mvn eclipse:eclipse -e (which will automatically set your project build path as shown in the below figure)
It will resolve your compilation issues and your project is ready as an deploy-able artifact

maven + elicpse related questions

Forgive me asking following questions. I am totally lost in regards to maven+eclipse. I checked out someone's java project (maven built) from SVN to my local eclipse (kepler). When I click Windows > Preferences, I see Maven.
question 1)
Is this a maven plugin? When developers say maven in eclipse, are they referring to maven plugin? maven and maven plugin are two separate components?
question 2)
when I click on user settings, C:\Users\myName.m2\settings.xml is missing. Exact error message is "User settings file doesn't exist". Does it get created when you install maven plugin at first time?
question 3)
I found three folders may have to do with maven C:\workspace\maven_local_repo_artifactory directory, C:\maven_local_repo and C:\Users\myName.m2\respository but not sure how they get created and what is the relationship among them.
question 4)
Is it ok to remove current maven plugin from eclipse and re-install it then check out the java project from SVN? I think my maven or maven plugin settings are not correct in my local box.
1) Is this a maven plugin? When developers say maven in eclipse, are
they referring to maven plugin? maven and maven plugin are two
separate components?
Yes. This is the maven-plugin. maven-plugin uses the configurations of maven (%M2_HOME%/conf).
If you wanna work with maven, you need to install it on your machine. Then you can run maven commmands. In addition, if you want to invoke maven commands within eclipse (conveniently) - you can install the eclipse-plugin. "maven-plugin" is a plugin for eclipse, that lets you use maven within Eclipse conveniently.
2) when I click on user settings, C:\Users\myName.m2\settings.xml is
missing. Exact error message is "User settings file doesn't exist".
Does it get created when you install maven plugin at first time?
By default, the maven-plugin assumes that your settings.xml (which is the configuration file of maven) is in the path you have mentioned. However, there are cases (like in my case) where the config file is not there, but under %M2_HOME%/conf. you can update it in Eclipse, and the error will disappear.
3) I found three folders may have to do with maven
C:\workspace\maven_local_repo_artifactory directory,
C:\maven_local_repo and C:\Users\myName.m2\respository but not sure
how they get created and what is the relationship among them.
C:\Users\myName.m2\respository is the "local repository". If you learned a bit about how maven works, it holds a local repo on the local machine, and it keeps there all artifacts. It downloads them from the "repository" - if you have one in your company (Nexus, Artifactory, etc) or from Maven Central. However, this path is configurable by Maven's settings. So there might be that someone played with it and changed the path, and these other directories were created. You did not mention what resides inside these paths...
4) Is it ok to remove current maven plugin from eclipse and re-install
it then check out the java project from SVN? I think my maven or maven
plugin settings are not correct in my local box.
Sure it is OK. You may remove the plugin, and the source plus maven itself will not be deleted from your machine.
HTH.

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