code: public void setFilterName(final String filterName) {
  		NullArgumentException.validateNotNull(filterName, "Filter name");
  		this.filterName = filterName;
  		// sepcify filter name for Pax Web
  		final WebAppInitParam initParam = new WebAppInitParam();
  		initParam.setParamName("filter-name");
  		initParam.setParamValue(filterName);
  		initParams.add(initParam);
  	}
docs: Setter.
  
  @param filterName value to set. Cannot be null
  @throws NullArgumentException if filter name is null