2.6.5问题，ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler#bean

[gMan1990]

• dubbo: 2.6.5
• 测试，所以提供者和消费者在同一个jvm里

---

ReferenceBeanInvocationHandler的invoke就是消费者方法执行后会调用到的方法，它有个init方法用来初始化bean字段，这个方法有两处调用：

1. https://github.com/apache/incubator-dubbo/blob/38e0f15be33a5edb35b45d2c5d7c6be753bdd888/dubbo-config/dubbo-config-spring/src/main/java/com/alibaba/dubbo/config/spring/beans/factory/annotation/ReferenceAnnotationBeanPostProcessor.java#L128

private InvocationHandler buildInvocationHandler(String referencedBeanName, ReferenceBean referenceBean) {
    ReferenceBeanInvocationHandler handler = localReferenceBeanInvocationHandlerCache.get(referencedBeanName);
    if (handler == null) {
        handler = new ReferenceBeanInvocationHandler(referenceBean);
    }
    if (applicationContext.containsBean(referencedBeanName)) { // Is local @Service Bean or not ?
        // ReferenceBeanInvocationHandler's initialization has to wait for current local @Service Bean has been exported.
        localReferenceBeanInvocationHandlerCache.put(referencedBeanName, handler);
    } else {
        // Remote Reference Bean should initialize immediately
        handler.init();
    }
    return handler;
}

2. https://github.com/apache/incubator-dubbo/blob/38e0f15be33a5edb35b45d2c5d7c6be753bdd888/dubbo-config/dubbo-config-spring/src/main/java/com/alibaba/dubbo/config/spring/beans/factory/annotation/ReferenceAnnotationBeanPostProcessor.java#L230

private void initReferenceBeanInvocationHandler(ServiceBean serviceBean) {
    String serviceBeanName = serviceBean.getBeanName();
    // Remove ServiceBean when it's exported
    ReferenceBeanInvocationHandler handler = localReferenceBeanInvocationHandlerCache.remove(serviceBeanName);
    // Initialize
    if (handler != null) {
        handler.init();
    }
}

---

因为是测试所以：1处走的是if (applicationContext.containsBean(referencedBeanName))里面，不会调用handler.init();，2处我断点到handler都是null所以也不会调用handler.init();
所以那个bean字段都是null。然后执行invoke方法就是：

java.lang.NullPointerException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.alibaba.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.invoke(ReferenceAnnotationBeanPostProcessor.java:159)

[mercyblitz]

Thanks for your report, We also found this issue, will be fixed on 2.6.6

[tswstarplanet]

请问是protocol配置成injvm吗？

[gMan1990]

@tswstarplanet 没有，是com.alibaba.dubbo.config.ReferenceConfig#createProxy方法自己查找提供者的

[mercyblitz]

@gMan1990
Actually, all services annotated @Service should be exported before ReferenceBean#afterPropertiesSet() method executation.

[tswstarplanet]

能提供demo吗？我自己复现没出现这个问题

[gMan1990]

@tswstarplanet

ReferenceBeanInvocationHandler的invoke就是消费者方法执行后会调用到的方法，它有个init方法用来初始化bean字段，这个方法有两处调用

你先看下这个是不是两处调用，每处调用debug下，看是否和我说的一样：

因为是测试所以：1处走的是if (applicationContext.containsBean(referencedBeanName))里面，不会调用handler.init();，2处我断点到handler都是null所以也不会调用handler.init();
所以那个bean字段都是null

然后执行invoke方法，看那个bean字段是否为null

[mercyblitz]

The duplicated issue : #3429

[flyer5200]

Thanks for your report, We also found this issue, will be fixed on 2.6.6

This problem still exists in 2.6.6 or 2.7.0, please confirm!