AspectJExpressionPointcut使用错误的classLoader

Question

我有一个Java EE应用程序，该应用程序由在Apache Felix容器中运行的多个OSGi捆绑软件组成。 这些捆绑包之一负责加载Spring应用程序上下文。 我在应用程序中使用Spring AOP，并且捆绑中出现以下错误：

java.lang.IllegalArgumentException: warning no match for this type name: com.somepackage.SomeClass [Xlint:invalidAbsoluteTypeName]
at org.aspectj.weaver.tools.PointcutParser.parsePointcutExpression(PointcutParser.java:301)
at org.springframework.aop.aspectj.AspectJExpressionPointcut.buildPointcutExpression(AspectJExpressionPointcut.java:206)
at org.springframework.aop.aspectj.AspectJExpressionPointcut.checkReadyToMatch(AspectJExpressionPointcut.java:192)
at org.springframework.aop.aspectj.AspectJExpressionPointcut.getClassFilter(AspectJExpressionPointcut.java:169)
at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:208)
at org.springframework.aop.support.AopUtils.canApply(AopUtils.java:262)
at org.springframework.aop.support.AopUtils.findAdvisorsThatCanApply(AopUtils.java:294)
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findAdvisorsThatCanApply(AbstractAdvisorAutoProxyCreator.java:118)
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findEligibleAdvisors(AbstractAdvisorAutoProxyCreator.java:88)
at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.getAdvicesAndAdvisorsForBean(AbstractAdvisorAutoProxyCreator.java:69)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:330)
at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:293)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:422)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1573)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:540)

导致此问题的原因是，我的方面的Pointcat中使用的类（com.somepackage.SomeClass）由捆绑包ClassLoader加载，但是AspectJExpressionPointcut将默认的ClassLoader传递给buildPointcutExpression（）方法：

private void checkReadyToMatch() {
    if (getExpression() == null) {
        throw new IllegalStateException("Must set property 'expression' before attempting to match");
    }
    if (this.pointcutExpression == null) {
        this.pointcutClassLoader = (this.beanFactory instanceof ConfigurableBeanFactory ?
                ((ConfigurableBeanFactory) this.beanFactory).getBeanClassLoader() :
                ClassUtils.getDefaultClassLoader());
        this.pointcutExpression = buildPointcutExpression(this.pointcutClassLoader);
    }
}

对此类一无所知（com.somepackage.SomeClass）。

Answer 1

通过在初始化Spring Application Context的线程中更改ClassLoader解决了该问题：

Thread.currentThread().setContextClassLoader(bundleClassLoader);

因此，方法ClassUtils.getDefaultClassLoader（）返回bundleClassLoader，它可以加载切入点中提到的类。