Performance difference between spring javaconfig, xml config and annotations

Question

Our Spring configuration contains about 1200 beans, and we use component-scan/@Autowired. If we exported the ApplicationContext as an Xml (and still used @Autowired), we saved about 10% on context startup-time.

What can we expect if we try spring javaconfig ?

Answer 1

The difference is likely not between annotations and XML, but instead it'll be the startup performance hit of using component-scanning, which is slow. If you add component-scanning to your XML version, you should find that it's just as slow.