@EnableLoadTimeWeaving is not working? but <context:load-time-weaver /> is worked!.

[madvirus]

I use Spring 3.2.0.

1. <context:load-time-weaver> and AspectJ is worked

-- XML configuration

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

	<context:load-time-weaver />
	
	<bean id="readArticleService" class="sp32.board.service.ReadArticleServiceImpl" />
...

-- META-INF/aop.xml

<aspectj>
	<weaver>
		<include within="sp32.board.service.*" />
		<include within="sp32.aop.annot.*" />
	</weaver>

	<aspects>
		<aspect name="sp32.aop.annot.ProfilingAspect" />
	</aspects>
</aspectj>

-- ProfilingAspect class

@Aspect
public class ProfilingAspect {

	@Pointcut("execution(public * sp32.board..*(..))")
	private void profileTarget() {}
	
	@Around("profileTarget()")
	public Object trace(ProceedingJoinPoint joinPoint) throws Throwable {
		String signatureString = joinPoint.getSignature().toShortString();
		System.out.println(signatureString + " started");
		long start = System.currentTimeMillis();
		try {
			Object result = joinPoint.proceed();
			return result;
		} finally {
			long finish = System.currentTimeMillis();
			System.out.println(signatureString + " finished");
			System.out.println(signatureString + " running time : " + (finish - start)
					+ "ms");
		}
	}
}

-- Main class

public class MainLTW {

	public static void main(String[] args) throws ArticleNotFoundException {
		String[] configLocations = new String[] { "classpath:/acLTW.xml" };
		ApplicationContext context = new GenericXmlApplicationContext(
				configLocations);

		ReadArticleService readArticleService = new ReadArticleServiceImpl();
		readArticleService.getArticleAndIncreaseReadCount(10);
		
		WriteArticleService writeArticleService = context.getBean(
				"writeArticleService", WriteArticleService.class);
		writeArticleService.write(new Article());
		...

-- run
java -javaagent:spring-instrument-3.2.0.RELEASE.jar sp32.MainLTW

-- result
successfully weave Aspect into *ArticleService.



2. @EnableLoadTimeWeaving and AspectJ is not worked

-- @Configuration spring config

@Configuration
@EnableLoadTimeWeaving(aspectjWeaving = AspectJWeaving.ENABLED)
public class SpringConfig {
	
	@Bean
	public ReadArticleServiceImpl articleService() {
		return new ReadArticleServiceImpl();
	}
....
}

-- aop.xml and ProfilingAspect are same as XML configuration

-- Main class

public class MainLTWConfiguration {

	public static void main(String[] args) throws ArticleNotFoundException {
		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
		context.register(SpringConfig.class);
		context.refresh();

		ReadArticleService readArticleService = new ReadArticleServiceImpl();
		readArticleService.getArticleAndIncreaseReadCount(10);
...

-- run
java -javaagent:spring-instrument-3.2.0.RELEASE.jar sp32.MainLTWConfiguration

-- result
does not weave Aspect into *ArticleService.


Let me know how can i weave aspect into spring bean when i use @EnableLoadTimeWeaving !!

Thanks for reading.
BK

[Marten Deinum]

Due to the usage of a class instead of xml your classes are already loaded before loadtimeweaving is applied and once a class is loaded it cannot be changed anymore. One thing you could try is to create 2 config classes one with @EnableLoadTimeWeaving and one with the bean definitions. Then make sure the @EnableLoadtimeWeaving one is loaded first.