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Avoid unnecessary CGLIB processing on configuration classes #34486
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on Mar 29, 2025
If a
@Configurationclass does not declare (or inherit) any instance-level@Beanmethods, generating an enhanced subclass with CGLIB is not adding any value. This is particularly likely for "holder"-like configuration classes with just imports, not least of it all common@SpringBootApplicationclasses. We can entirely skip CGLIB processing for such classes, also not incurring unnecessary potential for CGLIB class cache failures/fallbacks (#34423).