code: public void setPolicyMap(Map<Class<? extends Throwable>, RetryPolicy> policyMap) {
  		this.exceptionClassifier = new SubclassClassifier<Throwable, RetryPolicy>(
  				policyMap, new NeverRetryPolicy());
  	}
docs: Setter for policy map used to create a classifier. Either this property or the
  exception classifier directly should be set, but not both.
  @param policyMap a map of Throwable class to {@link RetryPolicy} that will be used
  to create a {@link Classifier} to locate a policy.