code: public boolean exists(ResourcePatternResolver resolver) {
  		Assert.notNull(resolver, "Resolver must not be null");
  		if (resolver.getResource(this.path).exists()) {
  			return true;
  		}
  		try {
  			return anyExists(resolver);
  		}
  		catch (IOException ex) {
  			return false;
  		}
  	}
docs: Determine if this template location exists using the specified
  {@link ResourcePatternResolver}.
  @param resolver the resolver used to test if the location exists
  @return {@code true} if the location exists.