Spotless fails with You need to specify 'delimiter'.

[obfischer]

Running the Spotless Maven plugin with the following configuration leads to the message:

[ERROR] Failed to execute goal com.diffplug.spotless:spotless-maven-plugin:2.43.0:apply (default-cli) on project demo: Execution default-cli of goal com.diffplug.spotless:spotless-maven-plugin:2.43.0:apply failed: You need to specify 'delimiter'. -> [Help 1]

Plugin configuration:

<plugin>
    <groupId>com.diffplug.spotless</groupId>
    <artifactId>spotless-maven-plugin</artifactId>
    <version>2.43.0</version>
    <configuration>
        <java>
            <palantirJavaFormat>
                <version>2.50.0</version>
                <style>PALANTIR</style>
                <formatJavadoc>false</formatJavadoc>
            </palantirJavaFormat>
            <formatAnnotations/>
        </java>
        <licenseHeader>
            <content>
                /* Foobar */
            </content>
        </licenseHeader>
        <json>
            <jackson>
                <version>2.14.1</version>    <!-- optional: The version of 'com.fasterxml.jackson.core:jackson-databind' to be used -->
                <features>                   <!-- optional: Customize the set of features (based on com.fasterxml.jackson.databind.SerializationFeature) -->
                    <INDENT_OUTPUT>true</INDENT_OUTPUT>                            <!-- optional: true by default -->
                    <ORDER_MAP_ENTRIES_BY_KEYS>false</ORDER_MAP_ENTRIES_BY_KEYS>   <!-- optional: false by default -->
                </features>
                <jsonFeatures>
                    <QUOTE_FIELD_NAMES>false</QUOTE_FIELD_NAMES>                   <!-- false by default -->
                </jsonFeatures>
                <!-- any JsonGenerator.Feature can be toggled on or off -->
                <spaceBeforeSeparator>false</spaceBeforeSeparator>               <!-- optional: false by default -->
            </jackson>
        </json>

    </configuration>
</plugin>

The plugin runs fine if I remove the JSON section.

Maven version: 3.9.8
Java version: 22.0.1
OS: Darwin Olivers-MBP.fritz.box 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:14:30 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T6030 arm64

[obfischer]

Ok, the field delimiter is needed for the licence head configuration. Although it is confusing for an unexperienced user of Spotless, as this field must be only set in certain configurations.