Fashioned after Spring XML's <aop:aspectj-autoproxy>, @AspectJAutoProxy detects any @Aspect beans and generates proxies as appropriate to weave the advice methods in those aspects against other beans in the container.

/**
 * An aspect that logs a message before any property (javabeans setter method) is invoked
 */
@Aspect
public class PropertyChangeTracker {
    private Logger logger = Logger.getLogger(PropertyChangeTracker.class);

    @Before("execution(void set*(*))")
    public void trackChange() {
        logger.info("property about to change");
    }
}
            

/**
 * A class with setter methods
 */
public class SimpleCache implements Cache {
    private int size = 100; // default value;
    private DataSource dataSource;

    public void setCacheSize(int size) {
        this.size = size;
    }

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }
}
            

/**
 * A @Configuration class that wires up TransferService and applies
 * the PropertyChangeTracker aspect.
 */
@Configuration
@AspectJAutoProxy
public class Config {

    // declare the aspect itself as a bean
    @Bean
    public PropertyChangeTracker propertyChangeTracker() {
        return new PropertyChangeTracker();
    }

    @Bean
    public Cache cache() {
        return new SimpleCache();
    }
}
            

/**
 * A main method to bootstrap the application
 */
public class Main {
    public static void main(String[] args) {
        JavaConfigApplicationContext ctx = new JavaConfigApplicationContext(Config.class);
        Cache cache = ctx.getBean(Cache.class);
        // should see "property about to change" message in the log when calling this line..
        cache.setCacheSize(1000);
    }
}
            

	Note
	The attributes to the @AspectJAutoProxy annotation are very similar to the attributes to the <aop:aspectj-autoproxy> element. See the related documentation and the JavaDoc for @AspectJAutoProxy for details.

@Aspect
@Configuration
@AspectJAutoProxy
public class Config {
    private Logger logger = Logger.getLogger(Config.class);

    // declare the advice method locally, eliminating the need for PropertyChangeTracker
    @Before("execution(void set*(*))")
    public void trackChange() {
        logger.info("property about to change");
    }

    @Bean
    public Cache cache() {
        return new SimpleCache();
    }
}