ModelInterpolationException error = AccessController.doPrivileged(action);

            if (error != null) {
                throw error;
            }
        } finally {
            getInterpolator().clearAnswers();
        }
    }

    protected Interpolator createInterpolator() {
        StringSearchInterpolator interpolator = new StringSearchInterpolator();
        interpolator.setCacheAnswers(true);

        interpolator = createInterpolator();
        recursionInterceptor = new PrefixAwareRecursionInterceptor(PROJECT_PREFIXES);
    }

    protected final Interpolator getInterpolator() {
        return interpolator;
    }