code: public void addMimeMapping(final WebAppMimeMapping mimeMapping) {
  		NullArgumentException.validateNotNull(mimeMapping, "Mime mapping");
  		NullArgumentException.validateNotNull(mimeMapping.getExtension(),
  				"Mime mapping extension");
  		NullArgumentException.validateNotNull(mimeMapping.getMimeType(),
  				"Mime mapping type");
  		mimeMappings.add(mimeMapping);
  	}
docs: Add a mime mapping.
  
  @param mimeMapping to add
  @throws NullArgumentException if mime mapping, extension or mime type is null