code: public Method findMethod(Object candidate) {
  		Assert.notNull(candidate, "candidate object must not be null");
  		Class<?> targetClass = AopUtils.getTargetClass(candidate);
  		if (targetClass == null) {
  			targetClass = candidate.getClass();
  		}
  		return this.findMethod(targetClass);
  	}
docs: Find a <em>single</em> Method on the Class of the given candidate object that
  contains the annotation type for which this resolver is searching.
  @param candidate the instance whose Class will be checked for the annotation
  @return a single matching Method instance or <code>null</code> if the candidate's
  Class contains no Methods with the specified annotation
  @throws IllegalArgumentException if more than one Method has the specified
  annotation