Add facet using eclipsewtp plugin

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1

I’ve this build.gradle file portion:

eclipse {
	classpath {
		downloadSources = true
		downloadJavadoc = true
		
		//customizing the classes output directory:
    	defaultOutputDir = file('build-eclipse')
	   
    	//minusConfigurations += [ configurations.querydsl ]
	}
	jdt {
		sourceCompatibility = 1.8
	    targetCompatibility = 1.8
	    //javaRuntimeName = "J2SE-1.8"
	}
	wtp {
    	facet {
      		//you can add some extra wtp facets; mandatory keys: 'name', 'version':
      		facet name: 'java', version: '1.8'
      		facet name: 'jst.web', version: '3.1'
      	}
    }
}

As you guess, I’m trying to add two facet on my project. However, only the first one is added.

Any ideas?