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clean:clean

Full name:

org.apache.maven.plugins:maven-clean-plugin:3.2.0:clean

Description:

Goal which cleans the build.

This attempts to clean a project's working directory of the files that were generated at build-time. By default, it discovers and deletes the directories configured in project.build.directory, project.build.outputDirectory, project.build.testOutputDirectory, and project.reporting.outputDirectory.

Files outside the default may also be included in the deletion by configuring the filesets tag.

Attributes:

  • Requires a Maven project to be executed.
  • The goal is thread-safe and supports parallel builds.
  • Since version: 2.0.

Optional Parameters

Name Type Since Description
<excludeDefaultDirectories> boolean 2.3 Disables the deletion of the default output directories configured for a project. If set to true, only the files/directories selected via the parameter filesets will be deleted.
Starting with 3.0.0 the property has been renamed from clean.excludeDefaultDirectories to maven.clean.excludeDefaultDirectories.
Default value is: false.
User property is: maven.clean.excludeDefaultDirectories.
<failOnError> boolean 2.2 Indicates whether the build will continue even if there are clean errors.
Default value is: true.
User property is: maven.clean.failOnError.
<fast> boolean 3.2 Enables fast clean if possible. If set to true, when the plugin is executed, a directory to be deleted will be atomically moved inside the maven.clean.fastDir directory and a thread will be launched to delete the needed files in the background. When the build is completed, maven will wait until all the files have been deleted. If any problem occurs during the atomic move of the directories, the plugin will default to the traditional deletion mechanism.
Default value is: false.
User property is: maven.clean.fast.
<fastDir> File 3.2 When fast clean is specified, the fastDir property will be used as the location where directories to be deleted will be moved prior to background deletion. If not specified, the ${maven.multiModuleProjectDirectory}/target/.clean directory will be used. If the ${build.directory} has been modified, you'll have to adjust this property explicitly. In order for fast clean to work correctly, this directory and the various directories that will be deleted should usually reside on the same volume. The exact conditions are system dependant though, but if an atomic move is not supported, the standard deletion mechanism will be used.
User property is: maven.clean.fastDir.
<fastMode> String 3.2 Mode to use when using fast clean. Values are: background to start deletion immediately and waiting for all files to be deleted when the session ends, at-end to indicate that the actual deletion should be performed synchronously when the session ends, or defer to specify that the actual file deletion should be started in the background when the session ends (this should only be used when maven is embedded in a long running process).
Default value is: background.
User property is: maven.clean.fastMode.
<filesets> Fileset[] 2.1 The list of file sets to delete, in addition to the default directories. For example: 
<filesets>
  <fileset>
    <directory>src/main/generated</directory>
    <followSymlinks>false</followSymlinks>
    <useDefaultExcludes>true</useDefaultExcludes>
    <includes>
      <include>*.java</include>
    </includes>
    <excludes>
      <exclude>Template*</exclude>
    </excludes>
  </fileset>
</filesets>

<followSymLinks> boolean 2.1 Sets whether the plugin should follow symbolic links while deleting files from the default output directories of the project. Not following symlinks requires more IO operations and heap memory, regardless whether symlinks are actually present. So projects with a huge output directory that knowingly does not contain symlinks can improve performance by setting this parameter to true.
Starting with 3.0.0 the property has been renamed from clean.followSymLinks to maven.clean.followSymLinks.
Default value is: false.
User property is: maven.clean.followSymLinks.
<retryOnError> boolean 2.4.2 Indicates whether the plugin should undertake additional attempts (after a short delay) to delete a file if the first attempt failed. This is meant to help deleting files that are temporarily locked by third-party tools like virus scanners or search indexing.
Default value is: true.
User property is: maven.clean.retryOnError.
<skip> boolean 2.2 Disables the plugin execution.
Starting with 3.0.0 the property has been renamed from clean.skip to maven.clean.skip.
Default value is: false.
User property is: maven.clean.skip.
<verbose> Boolean 2.1 Sets whether the plugin runs in verbose mode. As of plugin version 2.3, the default value is derived from Maven's global debug flag (compare command line switch -X).
Starting with 3.0.0 the property has been renamed from clean.verbose to maven.clean.verbose.
User property is: maven.clean.verbose.

Parameter Details

<excludeDefaultDirectories>

Disables the deletion of the default output directories configured for a project. If set to true, only the files/directories selected via the parameter filesets will be deleted.
Starting with 3.0.0 the property has been renamed from clean.excludeDefaultDirectories to maven.clean.excludeDefaultDirectories.
  • Type: boolean
  • Since: 2.3
  • Required: No
  • User Property: maven.clean.excludeDefaultDirectories
  • Default: false

<failOnError>

Indicates whether the build will continue even if there are clean errors.
  • Type: boolean
  • Since: 2.2
  • Required: No
  • User Property: maven.clean.failOnError
  • Default: true

<fast>

Enables fast clean if possible. If set to true, when the plugin is executed, a directory to be deleted will be atomically moved inside the maven.clean.fastDir directory and a thread will be launched to delete the needed files in the background. When the build is completed, maven will wait until all the files have been deleted. If any problem occurs during the atomic move of the directories, the plugin will default to the traditional deletion mechanism.
  • Type: boolean
  • Since: 3.2
  • Required: No
  • User Property: maven.clean.fast
  • Default: false

<fastDir>

When fast clean is specified, the fastDir property will be used as the location where directories to be deleted will be moved prior to background deletion. If not specified, the ${maven.multiModuleProjectDirectory}/target/.clean directory will be used. If the ${build.directory} has been modified, you'll have to adjust this property explicitly. In order for fast clean to work correctly, this directory and the various directories that will be deleted should usually reside on the same volume. The exact conditions are system dependant though, but if an atomic move is not supported, the standard deletion mechanism will be used.
  • Type: java.io.File
  • Since: 3.2
  • Required: No
  • User Property: maven.clean.fastDir

<fastMode>

Mode to use when using fast clean. Values are: background to start deletion immediately and waiting for all files to be deleted when the session ends, at-end to indicate that the actual deletion should be performed synchronously when the session ends, or defer to specify that the actual file deletion should be started in the background when the session ends (this should only be used when maven is embedded in a long running process).
  • Type: java.lang.String
  • Since: 3.2
  • Required: No
  • User Property: maven.clean.fastMode
  • Default: background

<filesets>

The list of file sets to delete, in addition to the default directories. For example: 
<filesets>
  <fileset>
    <directory>src/main/generated</directory>
    <followSymlinks>false</followSymlinks>
    <useDefaultExcludes>true</useDefaultExcludes>
    <includes>
      <include>*.java</include>
    </includes>
    <excludes>
      <exclude>Template*</exclude>
    </excludes>
  </fileset>
</filesets>
  • Type: org.apache.maven.plugins.clean.Fileset[]
  • Since: 2.1
  • Required: No

<followSymLinks>

Sets whether the plugin should follow symbolic links while deleting files from the default output directories of the project. Not following symlinks requires more IO operations and heap memory, regardless whether symlinks are actually present. So projects with a huge output directory that knowingly does not contain symlinks can improve performance by setting this parameter to true.
Starting with 3.0.0 the property has been renamed from clean.followSymLinks to maven.clean.followSymLinks.
  • Type: boolean
  • Since: 2.1
  • Required: No
  • User Property: maven.clean.followSymLinks
  • Default: false

<retryOnError>

Indicates whether the plugin should undertake additional attempts (after a short delay) to delete a file if the first attempt failed. This is meant to help deleting files that are temporarily locked by third-party tools like virus scanners or search indexing.
  • Type: boolean
  • Since: 2.4.2
  • Required: No
  • User Property: maven.clean.retryOnError
  • Default: true

<skip>

Disables the plugin execution.
Starting with 3.0.0 the property has been renamed from clean.skip to maven.clean.skip.
  • Type: boolean
  • Since: 2.2
  • Required: No
  • User Property: maven.clean.skip
  • Default: false

<verbose>

Sets whether the plugin runs in verbose mode. As of plugin version 2.3, the default value is derived from Maven's global debug flag (compare command line switch -X).
Starting with 3.0.0 the property has been renamed from clean.verbose to maven.clean.verbose.
  • Type: java.lang.Boolean
  • Since: 2.1
  • Required: No
  • User Property: maven.clean.verbose