This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Framework 6.0.25!

Registering a LoadTimeWeaver

The LoadTimeWeaver is used by Spring to dynamically transform classes as they are loaded into the Java virtual machine (JVM).

To enable load-time weaving, you can add the @EnableLoadTimeWeaving to one of your @Configuration classes, as the following example shows:

  • Java

  • Kotlin

@Configuration
@EnableLoadTimeWeaving
public class AppConfig {
}
@Configuration
@EnableLoadTimeWeaving
class AppConfig

Alternatively, for XML configuration, you can use the context:load-time-weaver element:

<beans>
	<context:load-time-weaver/>
</beans>

Once configured for the ApplicationContext, any bean within that ApplicationContext may implement LoadTimeWeaverAware, thereby receiving a reference to the load-time weaver instance. This is particularly useful in combination with Spring’s JPA support where load-time weaving may be necessary for JPA class transformation. Consult the LocalContainerEntityManagerFactoryBean javadoc for more detail. For more on AspectJ load-time weaving, see Load-time Weaving with AspectJ in the Spring Framework.