UPDATE 2022-02-14: This plugin has moved from coveooss to the spotify Github org. The new groupId will be com.spotify.fmt, and the master branch has been renamed to main.
Formats your code using google-java-format which follows Google's code styleguide.
The format cannot be configured by design.
If you want your IDE to stick to the same format, google-java-format also includes integrations for IntelliJ and Eclipse IDE's, following the installation instructions on the README.
To have your sources automatically formatted on each build, add to your pom.xml:
<build>
<plugins>
<plugin>
<groupId>com.spotify.fmt</groupId>
<artifactId>fmt-maven-plugin</artifactId>
<version>VERSION</version>
<executions>
<execution>
<goals>
<goal>format</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>If you prefer, you can only check formatting at build time using the check goal:
<build>
<plugins>
<plugin>
<groupId>com.spotify.fmt</groupId>
<artifactId>fmt-maven-plugin</artifactId>
<version>VERSION</version>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>Both goals have a Maven lifecycle phase configured by default.
| Goal | Default Phase |
|---|---|
format |
process-sources |
check |
verify |
You may prefer to run these goals in a different phase instead.
Maven allows you to override the default phase by specifying a <phase> for the <execution>.
For example, you may prefer that the check goal is performed in an earlier phase such as validate:
<execution>
<phase>validate</phase>
<goals>
<goal>check</goal>
</goals>
</execution>sourceDirectory represents the directory where your Java sources that need to be formatted are contained. It defaults to ${project.build.sourceDirectory}
testSourceDirectory represents the directory where your test's Java sources that need to be formatted are contained. It defaults to ${project.build.testSourceDirectory}
additionalSourceDirectories represents a list of additional directories that contains Java sources that need to be formatted. It defaults to an empty list.
verbose is whether the plugin should print a line for every file that is being formatted. It defaults to false.
filesNamePattern represents the pattern that filters files to format. The defaults value is set to .*\.java.
skip is whether the plugin should skip the operation.
skipSortingImports is whether the plugin should skip sorting imports.
style sets the formatter style to be google or aosp. By default this is google. Projects using Android conventions may prefer aosp.
forkMode lets you specify whether to run google-java-format in a fork or in-process. Also adds JVM arguments when needed. Value default will fork when JDK 16+ is detected, never runs in-process, regardless of JDK version and always will always fork.
example:
<build>
<plugins>
<plugin>
<groupId>com.spotify.fmt</groupId>
<artifactId>fmt-maven-plugin</artifactId>
<version>VERSION</version>
<configuration>
<sourceDirectory>some/source/directory</sourceDirectory>
<testSourceDirectory>some/test/directory</testSourceDirectory>
<verbose>true</verbose>
<filesNamePattern>.*\.java</filesNamePattern>
<additionalSourceDirectories>
<param>some/dir</param>
<param>some/other/dir</param>
</additionalSourceDirectories>
<skip>false</skip>
<skipSortingImports>false</skipSortingImports>
<style>google</style>
</configuration>
<executions>
<execution>
<goals>
<goal>format</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>displayFiles default = true. Display the list of the files that are not compliant
displayLimit default = 100. Number of files to display that are not compliant`
style sets the formatter style to be google or aosp. By default this is 'google'. Projects using Android conventions may prefer aosp.
example to not display the non-compliant files:
<build>
<plugins>
<plugin>
<groupId>com.spotify.fmt</groupId>
<artifactId>fmt-maven-plugin</artifactId>
<version>VERSION</version>
<configuration>
<displayFiles>false</displayFiles>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>example to limit the display up to 10 files
<build>
<plugins>
<plugin>
<groupId>com.spotify.fmt</groupId>
<artifactId>fmt-maven-plugin</artifactId>
<version>VERSION</version>
<configuration>
<displayLimit>10</displayLimit>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>You can also use it on the command line
mvn com.spotify.fmt:fmt-maven-plugin:format
You can pass parameters via standard -D syntax.
mvn com.spotify.fmt:fmt-maven-plugin:format -Dverbose=true
-Dfmt.skip is whether the plugin should skip the operation.
Starting from version 1.8, Google Java Formatter requires Java 11 to run. Incidently, all versions of this plugin starting from 2.10 inclusively also require this Java version to properly function. The 2.9.x release branch is the most up-to-date version that still runs on Java 8.
- Make a PR to bump the version in the POM with the change from
mvn versions:set -DnewVersion=x.y[.z] - Make a tag -
git tag x.y.z - Do the release -
mvn clean deploy -P release - Create a GitHub release with merged PRs and other information.
- Wait for the release to be available in Maven Central
- Update version in use in the POM, and version in the README.