Gradle, War, tomcat and manifest

I'm trying to run a war file how it's provided in documentation. I do:

$ ./gradlew -Pprod war
$ java -jar  ./build/libs/jhipster-0.1-SNAPSHOT.war --spring.profiles.active=prod
no main manifest attribute, in ./build/libs/jhipster-0.1-SNAPSHOT.war

When I add Main-Class atribute to the war block:

war {
    baseName = 'jhipster'
    version =  '0.1-SNAPSHOT'
    manifest {
        attributes 'Main-Class': 'com.jhipster.web.Application'
    }
}

I get "Error: Could not find or load main class com.jhipster.web.Application"

It is said in spring-boot gradle plugin documentation http://ift.tt/1wXV4dg that it should find the Application class with main() method but somehow MANIFEST.MF contains only one line:

Manifest-Version: 1.0

What I do wrong?