palantir-java-format is supported by spotless out of the box. https://github.com/palantir/palantir-java-format

spotless-maven-plugin.xml

<plugin>
    <groupId>com.diffplug.spotless</groupId>
    <artifactId>spotless-maven-plugin</artifactId>
    <version>${spotless.version}</version>
    <configuration>
      <java>
        <palantirJavaFormat>
            <!-- Optionally specify a version -->
            <version>${palantirJavaFormat.version}</version>
        </palantirJavaFormat>
      </java>
    </configuration>
</plugin>