This deals with generating Extent reports for Cucumber-JVM, version 4.3 and above, by using a Maven Plugin which parses the Cucumber JSON report. For more details refer to this article. Sample implementation can be found here.

The plugin version 2.0.0 uses ExtentReport version 5 which deprecates many reporters other than Spark, Json and Klov. This plugin also includes a custom Pdf reporter. A ported version of the HTML extent report is also generated. The Spark, Json, Pdf and Html reports are enabled by default. Use the below configuration for the plugin.

<plugin>
	<groupId>tech.grasshopper</groupId>
	<artifactId>extentreports-cucumberjson-plugin</artifactId>
	<version>2.16.0</version>
	<executions>
		<execution>
			<id>report</id>
			<phase>post-integration-test</phase>
			<goals>
				<goal>extentreport</goal>
			</goals>
		</execution>
	</executions>
	<configuration>
		<cucumberJsonReportDirectory>${project.build.directory}</cucumberJsonReportDirectory>
		<extentPropertiesDirectory>${project.build.testResources[0].directory}</extentPropertiesDirectory>
		<displayAllHooks>false</displayAllHooks>
		<strictCucumber6Behavior>true</strictCucumber6Behavior>
	</configuration>
</plugin>

To use ExtentReports version 4 use the plugin version 1.6.0 in the POM. Refer to Plugin Configuration section in the article.

The Cucumber Json report is created with the below setting in the Cucumber runner. Refer to Cucumber JSON Formatter Setup section in the article.

@CucumberOptions(plugin = { "json:target/json-report/cucumber.json"})

Plugin Configuration -

Property	Type	Default	Description
cucumberJsonReportDirectory	mandatory		directory path of the JSON report
extentPropertiesDirectory	optional		directory path of the project extent.properties
displayAllHooks	optional	false	flag for all hooks are to be displayed
strictCucumber6Behavior	optional	true	flag to set undefined step to failed	Available after 2.0.0

Refer to Plugin Configuration section in the article.

Report Settings - The Spark, PDF, HTML and Json reporter are enabled by default. Refer to ExtentReport Settings section in the article.