gcr.io/paketo-buildpacks/maven

The Paketo Buildpack for Maven is a Cloud Native Buildpack that builds Maven-based applications from source.

Behavior

This buildpack will participate if all the following conditions are met:

• Another buildpack requires maven, jvm-application-package or both
• <APPLICATION_ROOT>/pom.xml exists or BP_MAVEN_POM_FILE is set to an existing POM file.

The buildpack will do the following:

• Requests that a JDK be installed
• Links the ~/.m2 to a layer for caching
• If <APPLICATION_ROOT>/mvnw does not exist and mvn is not on $PATH
  • Contributes Maven or Maven Daemon to a layer with all commands on $PATH
  • Runs <MAVEN_ROOT>/bin/mvn -Dmaven.test.skip=true --no-transfer-progress package to build the application
  • Caches $BP_MAVEN_BUILT_ARTIFACT to a layer
• If <APPLICATION_ROOT>/mvnw exists
  • Runs <APPLICATION_ROOT>/mvnw -Dmaven.test.skip=true --no-transfer-progress package to build the application
  • Caches $BP_MAVEN_BUILT_ARTIFACT to a layer
• If mvn is on $PATH
  • Runs mvn -Dmaven.test.skip=true --no-transfer-progress package to build the application
  • Caches $BP_MAVEN_BUILT_ARTIFACT to a layer
• Removes the source code in <APPLICATION_ROOT>, following include/exclude rules
• If $BP_MAVEN_BUILT_ARTIFACT matched a single file
  • Restores $BP_MAVEN_BUILT_ARTIFACT from the layer, expands the single file to <APPLICATION_ROOT>
• If $BP_MAVEN_BUILT_ARTIFACT matched a directory or multiple files
  • Restores the files matched by $BP_MAVEN_BUILT_ARTIFACT to <APPLICATION_ROOT>
• If $BP_JAVA_INSTALL_NODE is set to true and the buildpack finds one of the following at <APPLICATION_ROOT> or at the path set by $BP_NODE_PROJECT_PATH:
  • a yarn.lock file, the buildpack requests that yarn and node are installed at build time
  • a package.json file, the buildpack requests that node is installed at build time

Configuration

Environment Variable	Description
$BP_MAVEN_VERSION	Configure the major Maven version (e.g. 3, 4). Since the buildpack only ships a single version of each supported line, updates to the buildpack can change the exact version of Maven installed. If you require a specific minor/patch version of Maven, use the Maven wrapper instead.
$BP_MAVEN_BUILD_ARGUMENTS	Configure the arguments to pass to Maven. Defaults to -Dmaven.test.skip=true --no-transfer-progress package. --batch-mode will be prepended to the argument list in environments without a TTY.
$BP_MAVEN_ADDITIONAL_BUILD_ARGUMENTS	Configure the additionnal arguments (e.g. -DskipJavadoc; appended to BP_MAVEN_BUILD_ARGUMENTS) to pass to Maven. Defaults to `` (empty string).
$BP_MAVEN_ACTIVE_PROFILES	Configure the active profiles (comma separated: e.g. p1,!p2,?p3) to pass to Maven. Defaults to `` (empty string).
$BP_MAVEN_BUILT_MODULE	Configure the module to find application artifact in. Defaults to the root module (empty).
$BP_MAVEN_BUILT_ARTIFACT	Configure the built application artifact explicitly. Supersedes $BP_MAVEN_BUILT_MODULE Defaults to target/*.[ejw]ar. Can match a single file, multiple files or a directory. Can be one or more space separated patterns.
$BP_MAVEN_POM_FILE	Specifies a custom location to the project's pom.xml file. It should be a full path to the file under the /workspace directory or it should be relative to the root of the project (i.e. /workspace'). Defaults to pom.xml`.
$BP_MAVEN_DAEMON_ENABLED	Triggers apache maven-mvnd to be installed and configured for use instead of Maven. The default value is false. Set to true to use the Maven Daemon.
$BP_MAVEN_SETTINGS_PATH	Specifies a custom location to Maven's settings.xml file. If $BP_MAVEN_SETTINGS_PATH is set and a Maven binding is provided, the binding takes the higher precedence.
$BP_INCLUDE_FILES	Colon separated list of glob patterns to match source files. Any matched file will be retained in the final image. Defaults to `` (i.e. nothing).
$BP_EXCLUDE_FILES	Colon separated list of glob patterns to match source files. Any matched file will be specifically removed from the final image. If include patterns are also specified, then they are applied first and exclude patterns can be used to further reduce the fileset.
$BP_JAVA_INSTALL_NODE	Configure whether to request that yarn and node are installed by another buildpack**. If set to true, the buildpack will check the app root or path set by $BP_NODE_PROJECT_PATH for either: A yarn.lock file, which requires that yarn and node are installed or, a package.json file, which requires that node is installed. Defaults to false
$BP_NODE_PROJECT_PATH	Configure a project subdirectory to look for package.json and yarn.lock files

Note

** If the node and/or yarn requirements are met and the Node Engine or Yarn participate in the build, environment variables related to these buildpacks can be set, such as BP_NODE_PROJECT_PATH or BP_NODE_VERSION. See the Paketo Node.js docs for more info.

Bindings

The buildpack optionally accepts the following bindings:

Type: maven

Secret	Description
settings.xml	If present --settings=<path/to/settings.xml> is prepended to the maven arguments
settings-security.xml	If present -Dsettings.security=<path/to/settings-security.xml> is prepended to the maven arguments

Type: dependency-mapping

Key	Value	Description
<dependency-digest>	<uri>	If needed, the buildpack will fetch the dependency with digest <dependency-digest> from <uri>

License

This buildpack is released under version 2.0 of the Apache License.