Activates a Spring LoadTimeWeaver for this application context, available as a bean with the name "loadTimeWeaver". Any bean that implements the LoadTimeWeaverAware interface will then receive the LoadTimeWeaver reference automatically; for example, Spring's JPA bootstrap support. The default weaver is determined automatically. As of Spring 2.5: detecting Sun's GlassFish, Oracle's OC4J, Spring's VM agent and any ClassLoader supported by Spring's ReflectiveLoadTimeWeaver (for example, the TomcatInstrumentableClassLoader). The activation of AspectJ load-time weaving is specified via a simple flag (the 'aspectj-weaving' attribute), with the AspectJ class transformer registered through Spring's LoadTimeWeaver. AspectJ weaving will be activated by default if a "META-INF/aop.xml" resource is present in the classpath. This also activates the current application context for applying dependency injection to non-managed classes that are instantiated outside of the Spring bean factory (typically classes annotated with the @Configurable annotation). This will only happen if the AnnotationBeanConfigurerAspect is on the classpath (i.e. spring-aspects.jar), effectively activating "spring-configured" by default. See Javadoc for org.springframework.context.annotation.EnableLoadTimeWeaving for information on code-based alternatives to bootstrapping load-time weaving support.