NPE occurs when use @Reference in junit in spring boot application

[meixinbin]

运行环境：
jdk:1.8
dubbo:2.6.5
spring boot 2.0.4

问题描述：
在spring boot项目中使用Junit 测试dubbo服务，@reference 注解报空指针异常。而我用@Autowired 注解是没有问题的，并且用dubbo 2.5.2 及dubbo 2.8.4 都没有问题。

下图是我debug到dubbo的代码看到的，其中的服务Bean并没有被注入

下面是我用@Autowired 测试的结果，没有任何问题

这个问题只有在单元测试的时候出现，服务在其他系统里面是可以正常调用的

[meixinbin]

我调试了一下，就是因为ReferenceBeanInvocationHandler 类的init方法没有调用导致bean属性为null，
我把这个类做了如下修改：

在ReferenceBeanInvocationHandler 的构造方法里面调用init方法，解决了这个问题，但是不清楚这样做会不会有其它的问题。
下面是修改后的Junit测试结果：

[tswstarplanet]

Would you please provide a demo project that can reproduce the problem?

[meixinbin]

我已经把相关demo上传到github
https://github.com/meixinbin/dubbo-test

把项目里面的com.alibaba.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor 类删除即可重现bug

[mercyblitz]

Did you have used https://github.com/apache/incubator-dubbo-spring-boot-project ?

[meixinbin]

@mercyblitz
yes I do

[meixinbin]

@tswstarplanet
@mercyblitz
Has the problem been solved?

[felixz7]

I also encountered the same problem, unable to inject in junit
:: Dubbo Spring Boot (v2.7.0) : https://github.com/apache/incubator-dubbo-spring-boot-project
:: Dubbo (v2.7.0) : https://github.com/apache/incubator-dubbo
:: Discuss group : dev@dubbo.apache.org

[DUBBO] Unsubscribe: provider://192.168.200.232:8000/

@RunWith(SpringRunner::class)
@SpringBootTest
class UserServiceImplTest {

    // Place definition above class declaration to make field static
    private val _logger = KotlinLogging.logger {}

    @Reference(check = false, timeout = 10000)
    private lateinit var userService: UserService

    @Test
    fun getByUsernameOrPhoneNumOrEmail() {
        userService.getByUsernameOrPhoneNumOrEmail("test")
    }
}


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 org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor$ReferenceBeanInvocationHandler.invoke(ReferenceAnnotationBeanPostProcessor.java:158)
	at com.sun.proxy.$Proxy147.getByUsernameOrPhoneNumOrEmail(Unknown Source)
	at com.jidian.cosalon.upms.service.impl.UserServiceImplTest.getByUsernameOrPhoneNumOrEmail(UserServiceImplTest.kt:26)
	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 org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)