AspectJExpressionPointcut使用错误的classLoader

问题描述

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.我在我的应用程序中使用Spring AOP，并且捆绑中出现以下错误:

I have a Java EE application consisting of multiple OSGi bundles running within Apache Felix container. One of these bundles is responsible for loading Spring application context.I'm using Spring AOP in my application and the following error arised in my bundle:

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)

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:

The cause of this problem is that class(com.somepackage.SomeClass) used in pointcat of my aspect was loaded by bundle ClassLoader but AspectJExpressionPointcut passes default ClassLoader to buildPointcutExpression() method:

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).

which knows nothing about this class (com.somepackage.SomeClass).

推荐答案

问题是通过在初始化Spring Application Context的线程中更改ClassLoader来解决的:

The problem was solved by changing ClassLoader in thread initializing Spring Application Context:

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.

So method ClassUtils.getDefaultClassLoader() returns bundleClassLoader which can load class mentioned in pointcut.

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