code: public void setTomcatContextCustomizers(
  			Collection<? extends TomcatContextCustomizer> tomcatContextCustomizers) {
  		Assert.notNull(tomcatContextCustomizers,
  				"TomcatContextCustomizers must not be null");
  		this.tomcatContextCustomizers = new ArrayList<>(tomcatContextCustomizers);
  	}
docs: Set {@link TomcatContextCustomizer}s that should be applied to the Tomcat
  {@link Context}. Calling this method will replace any existing customizers.
  @param tomcatContextCustomizers the customizers to set