[nacos3.0.3] 停止服务时 nacos client 抛出 Cannot read field "sharePublisher" because "com.alibaba.nacos.common.notify.NotifyCenter.INSTANCE" is null

[herodotus-ecosystem]

环境

• nacos 3.0.3
• spring boot 3.5.5
• spring cloud 2025.0.0
• spring cloud alibaba 2023.0.3.3

问题

当服务退出时（即关闭服务），nacos client 抛出以下异常

Disconnected from the target VM, address: '127.0.0.1:4414', transport: 'socket'
2025-08-29T23:15:08.359+08:00  INFO 42852 --- [herodotus-cloud-upms] [       Thread-1] c.a.n.common.http.HttpClientBeanHolder   : [HttpClientBeanHolder] Start destroying common HttpClient
2025-08-29T23:15:08.359+08:00  INFO 42852 --- [herodotus-cloud-upms] [       Thread-3] c.a.nacos.common.notify.NotifyCenter     : [NotifyCenter] Start destroying Publisher
2025-08-29T23:15:08.359+08:00  INFO 42852 --- [herodotus-cloud-upms] [       Thread-3] c.a.nacos.common.notify.NotifyCenter     : [NotifyCenter] Completed destruction of Publisher
2025-08-29T23:15:08.359+08:00 ERROR 42852 --- [herodotus-cloud-upms] [ncesChangeEvent] c.a.nacos.common.notify.NotifyCenter     : Event listener exception : 

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1727) ~[na:na]
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420) ~[na:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.openEventHandler(DefaultPublisher.java:111) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.run(DefaultPublisher.java:95) ~[nacos-client-3.0.3.jar:na]

2025-08-29T23:15:08.359+08:00 ERROR 42852 --- [herodotus-cloud-upms] [yWatchLoadEvent] c.a.nacos.common.notify.NotifyCenter     : Event listener exception : 

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1727) ~[na:na]
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420) ~[na:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.openEventHandler(DefaultPublisher.java:111) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.run(DefaultPublisher.java:95) ~[nacos-client-3.0.3.jar:na]

2025-08-29T23:15:08.359+08:00 ERROR 42852 --- [herodotus-cloud-upms] [atchNotifyEvent] c.a.nacos.common.notify.NotifyCenter     : Event listener exception : 

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1727) ~[na:na]
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420) ~[na:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.openEventHandler(DefaultPublisher.java:111) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.run(DefaultPublisher.java:95) ~[nacos-client-3.0.3.jar:na]

2025-08-29T23:15:08.359+08:00 ERROR 42852 --- [herodotus-cloud-upms] [atchNotifyEvent] c.a.nacos.common.notify.NotifyCenter     : Event listener exception : 

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1727) ~[na:na]
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420) ~[na:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.openEventHandler(DefaultPublisher.java:111) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.run(DefaultPublisher.java:95) ~[nacos-client-3.0.3.jar:na]

2025-08-29T23:15:08.359+08:00 ERROR 42852 --- [herodotus-cloud-upms] [otify.SlowEvent] c.a.nacos.common.notify.NotifyCenter     : Event listener exception : 

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1727) ~[na:na]
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420) ~[na:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.openEventHandler(DefaultPublisher.java:111) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.run(DefaultPublisher.java:95) ~[nacos-client-3.0.3.jar:na]

2025-08-29T23:15:08.359+08:00 ERROR 42852 --- [herodotus-cloud-upms] [lityUpdateEvent] c.a.nacos.common.notify.NotifyCenter     : Event listener exception : 

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1727) ~[na:na]
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420) ~[na:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.openEventHandler(DefaultPublisher.java:111) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.run(DefaultPublisher.java:95) ~[nacos-client-3.0.3.jar:na]

2025-08-29T23:15:08.359+08:00  INFO 42852 --- [herodotus-cloud-upms] [       Thread-1] c.a.n.common.http.HttpClientBeanHolder   : [HttpClientBeanHolder] Completed destruction of HttpClient
2025-08-29T23:15:08.359+08:00 ERROR 42852 --- [herodotus-cloud-upms] [yWatchLoadEvent] c.a.nacos.common.notify.NotifyCenter     : Event listener exception : 

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1727) ~[na:na]
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420) ~[na:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.openEventHandler(DefaultPublisher.java:111) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.common.notify.DefaultPublisher.run(DefaultPublisher.java:95) ~[nacos-client-3.0.3.jar:na]

2025-08-29T23:15:08.361+08:00  INFO 42852 --- [herodotus-cloud-upms] [ionShutdownHook] c.a.c.n.registry.NacosServiceRegistry    : De-registering from Nacos Server now...
2025-08-29T23:15:08.369+08:00  INFO 42852 --- [herodotus-cloud-upms] [ionShutdownHook] c.a.c.n.registry.NacosServiceRegistry    : De-registration finished.
2025-08-29T23:15:08.378+08:00  WARN 42852 --- [herodotus-cloud-upms] [ionShutdownHook] ConfigServletWebServerApplicationContext : Exception thrown from ApplicationListener handling ContextClosedEvent

java.lang.NullPointerException: Cannot read field "sharePublisher" because "com.alibaba.nacos.common.notify.NotifyCenter.INSTANCE" is null
	at com.alibaba.nacos.common.notify.NotifyCenter.deregisterSubscriber(NotifyCenter.java:242) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.shutdown(NamingGrpcClientProxy.java:537) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.client.naming.remote.NamingClientProxyDelegate.shutdown(NamingClientProxyDelegate.java:212) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.nacos.client.naming.NacosNamingService.shutDown(NacosNamingService.java:637) ~[nacos-client-3.0.3.jar:na]
	at com.alibaba.cloud.nacos.NacosServiceManager.nacosServiceShutDown(NacosServiceManager.java:117) ~[spring-cloud-starter-alibaba-nacos-discovery-2023.0.3.3.jar:2023.0.3.3]
	at com.alibaba.cloud.nacos.registry.NacosServiceRegistry.close(NacosServiceRegistry.java:121) ~[spring-cloud-starter-alibaba-nacos-discovery-2023.0.3.3.jar:2023.0.3.3]
	at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.stop(AbstractAutoServiceRegistration.java:311) ~[spring-cloud-commons-4.3.0.jar:4.3.0]
	at com.alibaba.cloud.nacos.registry.NacosAutoServiceRegistration.onContextClosedEvent(NacosAutoServiceRegistration.java:122) ~[spring-cloud-starter-alibaba-nacos-discovery-2023.0.3.3.jar:2023.0.3.3]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.doInvoke(ApplicationListenerMethodAdapter.java:383) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.processEvent(ApplicationListenerMethodAdapter.java:255) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.event.ApplicationListenerMethodAdapter.onApplicationEvent(ApplicationListenerMethodAdapter.java:174) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:454) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:387) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1163) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.doClose(ServletWebServerApplicationContext.java:179) ~[spring-boot-3.5.5.jar:3.5.5]
	at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:1126) ~[spring-context-6.2.10.jar:6.2.10]
	at org.springframework.boot.SpringApplicationShutdownHook.closeAndWait(SpringApplicationShutdownHook.java:147) ~[spring-boot-3.5.5.jar:3.5.5]
	at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
	at org.springframework.boot.SpringApplicationShutdownHook.run(SpringApplicationShutdownHook.java:116) ~[spring-boot-3.5.5.jar:3.5.5]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]

[FangYuan33]

@KomachiSion 这个问题和我之前解决的 #13546 有关，爆出空指针的问题是：

1. NotifyCenter#shutdown 方法在关闭服务时会被调用，此时为了帮助 GC 便把 INSTANCE = null; 了
2. 这个时候 alibaba.clound 框架中的 NacosServiceManager 调用到了 NacosNamingService#shutDown 方法，直到调用到 NotifyCenter#deregisterSubscriber 方法
3. 在这个方法中，因为 INSTANCE 已经为 null 所以便触发了这个问题

影响范围可能不大，因为 NotifyCenter#shutdown 在执行过后其中要被关闭的资源已经都关了。

我有一个解决方案不知道合适不合适：

1. 将 NotifyCenter#deregisterPublisher 方法和 NotifyCenter#deregisterSubscriber 方法，这两个取消注册相关的方法中添加上关于 INSTANCE 的判空逻辑，如果为空那么直接 return，说明其中已经没有资源要被关闭了
2. 另外关于打印 java.lang.InterruptedException: null 日志的问题，这个是为了帮助阻塞线程能被终止在 DefaultPublisher#shutdown 方法中添加了 this.interrupt(); 的逻辑，这个打印处理不太美观，感觉可以在 DefaultPublisher#openEventHandler 方法中添加一个专门针对 InterruptedException 的 catch 逻辑，不让它打印这么多堆栈了

[KomachiSion]

1. 是否不需要设置为null？ shutdown的主要目的是释放线程池， 感觉并不需要将INSTANCE设置为null。
2. 在interrupt调用的地方catch， 然后标记为ignored是否也可以？

[FangYuan33]

@KomachiSion 提交了一个 PR #13765 修复以上的问题，第一点我重新又看了一下，发现你分析的是对的，已经去掉了置空逻辑

另外除了客户端会打印无效的 InterruptedException 外，我发现服务端在关闭时也有同样地 InterruptedException 日志，一并也修复了，如下

2025-09-01T15:06:12.053+08:00 ERROR 33122 --- [cuteEngine_5%16] com.alibaba.nacos.core.protocol.distro   : [TASK-FAILED] java.lang.InterruptedException

java.lang.InterruptedException: null
	at java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1645)
	at java.base/java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:420)
	at com.alibaba.nacos.common.task.engine.TaskExecuteWorker$InnerWorker.run(TaskExecuteWorker.java:118)