Maven windows setting xml

Maven windows setting xml

The settings element in the settings.xml file contains elements used to define values which configure Maven execution in various ways, like the pom.xml , but should not be bundled to any specific project, or distributed to an audience. These include values such as the local repository location, alternate remote repository servers, and authentication information.

There are two locations where a settings.xml file may live:

  • The Maven install: $/conf/settings.xml
  • A user’s install: $/.m2/settings.xml

The former settings.xml are also called global settings, the latter settings.xml are referred to as user settings. If both files exists, their contents gets merged, with the user-specific settings.xml being dominant.

Tip: If you need to create user-specific settings from scratch, it’s easiest to copy the global settings from your Maven installation to your $/.m2 directory. Maven’s default settings.xml is a template with comments and examples so you can quickly tweak it to match your needs.

Here is an overview of the top elements under settings :

The contents of the settings.xml can be interpolated using the following expressions:

  1. $ and all other system properties (since Maven 3.0)
  2. $ etc. for environment variables

Note that properties defined in profiles within the settings.xml cannot be used for interpolation.

Settings Details

Simple Values

Half of the top-level settings elements are simple values, representing a range of values which describe elements of the build system that are active full-time.

  • localRepository: This value is the path of this build system’s local repository. The default value is $/.m2/repository . This element is especially useful for a main build server allowing all logged-in users to build from a common local repository.
  • interactiveMode: true if Maven should attempt to interact with the user for input, false if not. Defaults to true .
  • offline: true if this build system should operate in offline mode, defaults to false . This element is useful for build servers which cannot connect to a remote repository, either because of network setup or security reasons.

Plugin Groups

This element contains a list of pluginGroup elements, each contains a groupId. The list is searched when a plugin is used and the groupId is not provided in the command line. This list automatically contains org.apache.maven.plugins and org.codehaus.mojo .

For example, given the above settings the Maven command line may execute org.eclipse.jetty:jetty-maven-plugin:run with the truncated command:

Servers

The repositories for download and deployment are defined by the repositories and distributionManagement elements of the POM. However, certain settings such as username and password should not be distributed along with the pom.xml . This type of information should exist on the build server in the settings.xml .

  • id: This is the ID of the server (not of the user to login as) that matches the id element of the repository/mirror that Maven tries to connect to.
  • username, password: These elements appear as a pair denoting the login and password required to authenticate to this server.
  • privateKey, passphrase: Like the previous two elements, this pair specifies a path to a private key (default is $/.ssh/id_dsa ) and a passphrase , if required. The passphrase and password elements may be externalized in the future, but for now they must be set plain-text in the settings.xml file.
  • filePermissions, directoryPermissions: When a repository file or directory is created on deployment, these are the permissions to use. The legal values of each is a three digit number corresponding to *nix file permissions, e.g. 664, or 775.

Note: If you use a private key to login to the server, make sure you omit the

element. Otherwise, the key will be ignored.

Password Encryption

A new feature — server password and passphrase encryption has been added to 2.1.0+. See details on this page

Mirrors

  • id, name: The unique identifier and user-friendly name of this mirror. The id is used to differentiate between mirror elements and to pick the corresponding credentials from the section when connecting to the mirror.
  • url: The base URL of this mirror. The build system will use this URL to connect to a repository rather than the original repository URL.
  • mirrorOf: The id of the repository that this is a mirror of. For example, to point to a mirror of the Maven central repository ( https://repo.maven.apache.org/maven2/ ), set this element to central . More advanced mappings like repo1,repo2 or *,!inhouse are also possible. This must not match the mirror id .

For a more in-depth introduction of mirrors, please read the Guide to Mirror Settings.

Proxies

  • id: The unique identifier for this proxy. This is used to differentiate between proxy elements.
  • active: true if this proxy is active. This is useful for declaring a set of proxies, but only one may be active at a time.
  • protocol, host, port: The protocol://host:port of the proxy, separated into discrete elements.
  • username, password: These elements appear as a pair denoting the login and password required to authenticate to this proxy server.
  • nonProxyHosts: This is a list of hosts which should not be proxied. The delimiter of the list is the expected type of the proxy server; the example above is pipe delimited — comma delimited is also common.

Profiles

The profile element in the settings.xml is a truncated version of the pom.xml profile element. It consists of the activation , repositories , pluginRepositories and properties elements. The profile elements only include these four elements because they concerns themselves with the build system as a whole (which is the role of the settings.xml file), not about individual project object model settings.

If a profile is active from settings , its values will override any equivalently ID’d profiles in a POM or profiles.xml file.

Activation

Activations are the key of a profile. Like the POM’s profiles, the power of a profile comes from its ability to modify some values only under certain circumstances; those circumstances are specified via an activation element.

Activation occurs when all specified criteria have been met, though not all are required at once.

  • jdk: activation has a built in, Java-centric check in the jdk element. This will activate if the test is run under a jdk version number that matches the prefix given. In the above example, 1.5.0_06 will match. Ranges are also supported. See the maven-enforcer-plugin for more details about supported ranges.
  • os: The os element can define some operating system specific properties shown above. See the maven-enforcer-plugin for more details about OS values.
  • property: The profile will activate if Maven detects a property (a value which can be dereferenced within the POM by $ ) of the corresponding name=value pair.
  • file: Finally, a given filename may activate the profile by the existence of a file, or if it is missing .

The activation element is not the only way that a profile may be activated. The settings.xml file’s activeProfile element may contain the profile’s id . They may also be activated explicitly through the command line via a comma separated list after the -P flag (e.g. -P test ).

To see which profile will activate in a certain build, use the maven-help-plugin .

Properties

Maven properties are value placeholder, like properties in Ant. Their values are accessible anywhere within a POM by using the notation $ , where X is the property. They come in five different styles, all accessible from the settings.xml file:

  1. env.X : Prefixing a variable with “env.” will return the shell’s environment variable. For example, $ contains the $path environment variable ( %PATH% in Windows).
  2. project.x : A dot (.) notated path in the POM will contain the corresponding element’s value. For example:

is accessible via $ .

  • settings.x : A dot (.) notated path in the settings.xml will contain the corresponding element’s value. For example: false is accessible via $ .
  • Java System Properties: All properties accessible via java.lang.System.getProperties() are available as POM properties, such as $ .
  • x : Set within a

    element or an external files, the value may be used as $ .

    The property $ is accessible from a POM if this profile is active.

    Repositories

    Repositories are remote collections of projects from which Maven uses to populate the local repository of the build system. It is from this local repository that Maven calls it plugins and dependencies. Different remote repositories may contain different projects, and under the active profile they may be searched for a matching release or snapshot artifact.

    • releases, snapshots: These are the policies for each type of artifact, Release or snapshot. With these two sets, a POM has the power to alter the policies for each type independent of the other within a single repository. For example, one may decide to enable only snapshot downloads, possibly for development purposes.
    • enabled: true or false for whether this repository is enabled for the respective type ( releases or snapshots ).
    • updatePolicy: This element specifies how often updates should attempt to occur. Maven will compare the local POM’s timestamp (stored in a repository’s maven-metadata file) to the remote. The choices are: always , daily (default), interval:X (where X is an integer in minutes) or never .
    • checksumPolicy: When Maven deploys files to the repository, it also deploys corresponding checksum files. Your options are to ignore , fail , or warn on missing or incorrect checksums.
    • layout: In the above description of repositories, it was mentioned that they all follow a common layout. This is mostly correct. Maven 2 has a default layout for its repositories; however, Maven 1.x had a different layout. Use this element to specify which if it is default or legacy .

    Plugin Repositories

    Repositories are home to two major types of artifacts. The first are artifacts that are used as dependencies of other artifacts. These are the majority of artifacts that reside within central. The other type of artifact is plugins. Maven plugins are themselves a special type of artifact. Because of this, plugin repositories may be separated from other repositories (although, I have yet to hear a convincing argument for doing so). In any case, the structure of the pluginRepositories element block is similar to the repositories element. The pluginRepository elements each specify a remote location of where Maven can find new plugins.

    Maven – Settings File

    Maven settings.xml file contains configurations that are not specific to a project, but are global in nature. It also contains information that is not meant to be distributed (e.g. passwords).

    Location of Maven Settings File

    Maven can have two settings files working at a time:

    • The Maven installation directory: $M2_HOME/conf/settings.xml [global settings]
    • The user’s home directory: $/.m2/settings.xml [user settings]

    Both files are optional. If both files are present, the values in the user home settings file overrides the values from global settings file.

    Maven Default setting.xml

    A default maven setting.xml look like this:

    A brief description of the elements is given in below table:

    Element Name Description
    localRepository Maven stores copies of plug-ins and dependencies locally in the C:\Users\ \.m2\repository folder. This element can be used to change the path of the local repository.
    interactiveMode As the name suggests, when this value is set to true , the default value, Maven interacts with the user for input.
    usePluginRegistry It decide that if Maven should use the $/.m2/plugin-registry.xml file to manage plugin versions. Its default value is false .
    offline When set to true , this configuration instructs Maven to operate in an offline mode. The default is false .
    pluginGroups It contains a list of pluginGroup elements, each contains a groupId . The list is searched when a plugin is used and the groupId is not provided in the command line. This list automatically contains org.apache.maven.plugins and org.codehaus.mojo .
    servers Maven can interact with a variety of servers, such as Apache Subversion (SVN) servers, build servers, and remote repository servers. This element allows you to specify security credentials, such as the username and password, which you need to connect to those servers.
    mirrors As the name suggests, mirrors allow you to specify alternate locations for your repositories.
    proxies proxies contains the HTTP proxy information needed to connect to the Internet.
    profiles profiles allow you to group certain configuration elements, such as repositories and pluginRepositories .
    activeProfile The activeProfile allows you to specify a default profile to be active for Maven to use.

    Drop me your questions in comments section.

    Maven — in settings.xml

    I use tomcat-maven-plugin to deploy my war to a server. What I have to do is configure it like this in my pom.xml:

    But then I obviously want to keep this settings in a different place since I work on my computer but then there’s a staging and a live server as well where the settings of the server are different.

    So let’s use the .m2/settings.xml :

    Now change the pom.xml:

    But where to put the URL of the server? There’s no place for that in the settings.xml under the server tag! Maybe like this?

    ..and use the $ property.

    But then the question is, why use the server tag in settings.xml at all? Why not use properties for the username and password as well? Or is there a place for the URL as well in the settings URL so I don’t have to use properties?

    2 Answers 2

    First off let me say, profiles are one of the most powerful features of Maven.

    First make a profile in your pom.xml that looks like this:

    /.m2/settings.xml file add servers entries like this:

    The configure your build plugin like this:

    This will enabled your tomcat-localhost profile by default and allow you to deploy to it with a simple mvn clean package tomcat:deploy .

    To deploy to other targets, set up a new entry in settings.xml with the appropriate credentials. Add a new profile but leave off the stanza and configure it to point to the appropriate details.

    Then to use it do mvn clean package tomcat:deploy -P [profile id] where the [profile id] is the new profile.

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