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My portlet (actually configuration action) have difficulty to resolve ServletContext reference:

Bundle {id: 1498, name: my.knowledge.base.web, version: 1.0.0}
	Declarative Service {id: 9862, name: my.knowledge.base.action.UniKBAdminConfigurationAction, unsatisfied references: 
		{name: ServletContext, target: (osgi.web.symbolicname=my.knowledge.base.web)}
	}
}

The source is just clone of this action: https://github.com/liferay/liferay-portal/blob/master/modules/apps/blogs/blogs-web/src/main/java/com/liferay/blogs/web/internal/portlet/action/BlogsConfigurationAction.java

In my web module POM file I have servlet-api dependency and the module is compiled without any errors. 

Any idea why such core class is not resolved properly?