Pom maven install

Improve this question. Aaron Digulla Aaron Digulla k gold badges silver badges bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Sign up or log in Sign up using Google. Sign up using Facebook. Using wildcard excludes makes it easy to exclude all a dependency's transitive dependencies. In the case below you may be working with the maven-embedder and you want to manage the dependencies you use yourself, so you clip all the transitive dependencies:.

One powerful addition that Maven brings to build management is the concept of project inheritance. Although in build systems such as Ant inheritance can be simulated, Maven makes project inheritance explicit in the project object model. The packaging type required to be pom for parent and aggregation multi-module projects. These types define the goals bound to a set of lifecycle stages. For example, if packaging is jar , then the package phase will execute the jar:jar goal.

Now we may add values to the parent POM, which will be inherited by its children. Most elements from the parent POM are inherited by its children, including:. Notice the relativePath element. It is not required, but may be used as a signifier to Maven to first search the path given for this project's parent, before searching the local and then remote repositories. Similar to the inheritance of objects in object oriented programming, POMs that extend a parent POM inherit certain values from that parent.

Moreover, just as Java objects ultimately inherit from java. Besides inheriting certain top-level elements, parents have elements to configure values for child POMs and transitive dependencies.

One of those elements is dependencyManagement. Note that the version and scope of artifacts which are incorporated from transitive dependencies are also controlled by version specifications in a dependency management section.

This can lead to unexpected consequences. Consider a case in which your project uses two dependences, dep1 and dep2. If you then use dependencyManagement to specify an older version, dep2 will be forced to use the older version, and fail.

So, you must be careful to check the entire dependency tree to avoid this problem; mvn dependency:tree is helpful. A project with modules is known as a multi-module, or aggregator project. Modules are projects that this POM lists, and are executed as a group. A pom packaged project may aggregate the build of a set of projects by listing them as modules, which are relative paths to the directories or the POM files of those projects.

You do not need to consider the inter-module dependencies yourself when listing the modules; i. Maven will topologically sort the modules such that dependencies are always build before dependent modules. Inheritance and aggregation create a nice dynamic to control builds through a single, high-level POM.

You often see projects that are both parents and aggregators. For example, the entire Maven core runs through a single base POM org. However, an aggregator project and a parent project are both POM projects, they are not one and the same and should not be confused.

A POM project may be inherited from - but does not necessarily have - any modules that it aggregates. Conversely, a POM project may aggregate projects that do not inherit from it. Properties are the last required piece to understand POM basics. Maven properties are value placeholders, like properties in Ant. Or they can be used by plugins as default values, for example:. Note: While environment variables themselves are case-insensitive on Windows, lookup of properties is case-sensitive.

The names of environment variables are normalized to all upper-case for the sake of reliability. Beyond the basics of the POM given above, there are two more elements that must be understood before claiming basic competency of the POM. They are the build element, that handles things like declaring your project's directory structure and managing plugins; and the reporting element, that largely mirrors the build element for reporting purposes.

According to the POM 4. Let us begin with an analysis of the common elements between the two. Note: These different build elements may be denoted "project build" and "profile build". BaseBuild is exactly as it sounds: the base set of elements between the two build elements in the POM. For a more comprehensive look at what filters are and what they can do, take a look at the quick start guide. Another feature of build elements is specifying where resources exist within your project.

Resources are not usually code. They are not compiled, but are items meant to be bundled within your project or used for various other reasons, such as code generation. For example, a Plexus project requires a configuration. In order for the JAR plugin to bundle the resource correctly, you would specify resources similar to the following:. Beyond the standard coordinate of groupId:artifactId:version , there are elements which configure the plugin or this builds interaction with it.

And consider the following plugin configuration from a project that uses that parent as its parent:. The default behavior is to merge the content of the configuration element according to element name. If the child POM has a particular element, that value becomes the effective value.

Note that this is purely an operation on XML; no code or configuration of the plugin itself is involved. Only the elements, not their values, are involved. You can control how child POMs inherit configuration from parent POMs by adding attributes to the children of the configuration element. The attributes are combine. Use these attributes in a child POM to control how Maven combines plugin configuration from the parent with the explicit configuration in the child.

You cannot use both combine. Note that these attributes only apply to the configuration element they are declared on, and are not propagated to nested elements. That is if the content of an item element from the child POM was a complex structure instead of text, its sub-elements would still be subject to the default merge strategy unless they were themselves marked with attributes.

The combine. For example, suppose you wanted to bind the antrun:run goal to the verify phase. We want the task to echo the build directory, as well as avoid passing on this configuration to its children assuming it is a parent by setting inherited to false. You would get an execution like this:. If we added these specifications to the plugins element, they would apply only to a single POM.

So, let's fir quickly see how to can specify the java path in Jenkins:. Maven integration with Jenkins starts with setting up the Java path in Jenkins. Kindly follow the below steps to setup Java path in Jenkins:.

Step 1: Open the Jenkins and go to Jenkins Dashboard. After that, click on the Manage Jenkins link as shown below:. As soon as we click on the "Manage Jenkins" link, we will redirect towards the Manage Jenkins page in which we can see different types of options, and from here, we can see the "Global Tool Configuration" option. Step 2: Now click on the Global Tool Configuration link as highlighted below:.

As soon as we click on Global Tool Configuration, we will be redirected to the Global tool configuration page to specify different configurations. To set the JDK path in Jenkins, please follow the below-highlighted steps:. After this, the JDK path is properly set up in Jenkins. Now, the next task is to set up the Maven path in Jenkins. In the previous section, we saw how to set up the Java path in Jenkins, and now, in this section, we will set up the Maven path in Jenkins.

Please follow the below steps to set up the Maven path in Jenkins. Now that we have configured both Java and Maven in Jenkins, Let's see how to create and execute a Maven project in Jenkins?

Jenkins provides a particular job type, which explicitly provides options for configuring and executing a Maven project. This job type is called the "Maven project. We know that the pom. For demonstration purposes, we already created a maven project, which is pushed into the GitHub repository. For creating a Maven project in Jenkins, follow the steps as mentioned below:. Step 1: Firstly, we need to create a job. To create this, click on the "New Item" option as highlighted below:.

Also, if we need to select the "GitHub hook trigger for GITScm polling" option in the "Build Triggers" section, we will trigger our build with the help of webhooks. Same for all other phases. Install or package will trigger all preceding phases, but you need to specify clean in addition. Maven will always download your project dependencies into your local maven repository first and then reference them for your build.

When you think back at your pom. You can find others in this thread on Stackoverflow. Then it takes that. In theory, calling mvn install would be enough if Maven was smart enough to do reliable, incremental builds. In practice, it is actually enough for the vast majority of cases, but note: Before Maven 3. Hence developers got it ingrained to always call 'mvn clean install', even though this increases build time a lot in bigger projects.

Unfortunately, this is something that happens in multi-module projects and other build tools like e. Gradle have no problem with it. Imagine your Maven build looks like this:. The problem is: Maven will NOT be smart enough to automatically build stock-data as a needed sibling dependency. Instead, you will need to have stock-data built already, yourself. In our case, this would look like:.

This is a bit oversimplified, but if you want to make sure that Maven always tries to download the latest snapshot dependency versions, invoke it with the -U switch. Some projects come with a mvnw executable, which does not stand for Maven on Windows, but rather for Maven wrapper. This guide is just a quick overview of what Maven can do for you and how to work around its most common pitfalls.