sustain/src/main/java/net/happyonroad/spring/support/DefaultServiceRegistry.java
@Override
    public <T> T getService(Class<T> requiredType) {
        return getService(requiredType, ANY_HINT);
    }
@Override
    public <T> T getService(Class<T> requiredType) {
        return getService(requiredType, ANY_HINT);
    }
//////////////////////////////////////////////////////////////////////