应用关闭时报错

[fenston]

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Which Component
eg. Nacos Discovery, Sentinel

Describe the bug
A clear and concise description of what the bug is.
应用关闭时报错，报错日志如下

2026-02-05 18:32:36.182 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.client.naming : Shutdown naming grpc client proxy for uuid->801b6ebc-3cdc-4902-a027-405de8b04db8
2026-02-05 18:32:36.182 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.client.naming : Shutdown grpc redo service executor java.util.concurrent.ScheduledThreadPoolExecutor@7699bf76[Running, pool size = 1, active threads = 0, queued tasks = 1, completed tasks = 119]
2026-02-05 18:32:36.182 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.common.remote.client : Shutdown rpc client, set status to shutdown
2026-02-05 18:32:36.182 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.common.remote.client : Shutdown client event executor java.util.concurrent.ScheduledThreadPoolExecutor@24049fed[Running, pool size = 2, active threads = 2, queued tasks = 0, completed tasks = 0]
2026-02-05 18:32:36.182 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.common.remote.client : Close current connection 1770287195645_192.168.134.1_8996
2026-02-05 18:32:36.185 [system-admin,,,] [licationShutdownHook] INFO 7444 --- c.a.n.c.remote.client.grpc.GrpcClient : Shutdown grpc executor java.util.concurrent.ThreadPoolExecutor@536f0b6a[Running, pool size = 6, active threads = 0, queued tasks = 0, completed tasks = 154]
2026-02-05 18:32:36.185 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.client.naming : shutdown and remove naming rpc client for uuid ->801b6ebc-3cdc-4902-a027-405de8b04db8
2026-02-05 18:32:36.185 [system-admin,,,] [licationShutdownHook] ERROR 7444 --- c.a.c.n.r.NacosGracefulShutdownDelegate : Error occurred while performing Nacos client graceful shutdown

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)
at com.alibaba.nacos.client.naming.remote.gprc.NamingGrpcClientProxy.shutdown(NamingGrpcClientProxy.java:537)
at com.alibaba.nacos.client.naming.remote.NamingClientProxyDelegate.shutdown(NamingClientProxyDelegate.java:212)
at com.alibaba.nacos.client.naming.NacosNamingService.shutDown(NacosNamingService.java:637)
at com.alibaba.cloud.nacos.NacosServiceManager.nacosServiceShutDown(NacosServiceManager.java:117)
at com.alibaba.cloud.nacos.registry.NacosServiceRegistry.close(NacosServiceRegistry.java:120)
at org.springframework.cloud.client.serviceregistry.AbstractAutoServiceRegistration.stop(AbstractAutoServiceRegistration.java:311)
at com.alibaba.cloud.nacos.registry.NacosGracefulShutdownDelegate.doGracefulShutdown(NacosGracefulShutdownDelegate.java:69)
at com.alibaba.cloud.nacos.registry.NacosGracefulShutdownDelegate.onApplicationEvent(NacosGracefulShutdownDelegate.java:64)
at com.alibaba.cloud.nacos.registry.NacosGracefulShutdownDelegate.onApplicationEvent(NacosGracefulShutdownDelegate.java:34)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:454)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:387)
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1166)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.doClose(ServletWebServerApplicationContext.java:179)
at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:1129)
at org.springframework.boot.SpringApplicationShutdownHook.closeAndWait(SpringApplicationShutdownHook.java:147)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.SpringApplicationShutdownHook.run(SpringApplicationShutdownHook.java:116)
at java.base/java.lang.Thread.run(Thread.java:1583)

2026-02-05 18:32:36.207 [system-admin,,,] [licationShutdownHook] INFO 7444 --- o.s.b.w.e.tomcat.GracefulShutdown : Commencing graceful shutdown. Waiting for active requests to complete
2026-02-05 18:32:36.219 [system-admin,,,] [ tomcat-shutdown] INFO 7444 --- o.s.b.w.e.tomcat.GracefulShutdown : Graceful shutdown complete
2026-02-05 18:32:36.228 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.client.naming : com.alibaba.nacos.client.naming.cache.ServiceInfoHolder do shutdown begin
2026-02-05 18:32:36.228 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.client.naming : com.alibaba.nacos.client.naming.backups.FailoverReactor do shutdown begin
2026-02-05 18:32:36.228 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.client.naming : com.alibaba.nacos.client.naming.backups.FailoverReactor do shutdown stop
2026-02-05 18:32:36.228 [system-admin,,,] [licationShutdownHook] INFO 7444 --- com.alibaba.nacos.client.naming : com.alibaba.nacos.client.naming.cache.ServiceInfoHolder do shutdown stop

Simplest demo
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To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Additional context
Add any other context about the problem here.
e.g. MacOS 、Java8 、 Version 0.2.1.RELEASE
java21
spring-boot 3.5.10
spring-cloud.version 2025.0.0
spring-cloud-alibaba 2025.0.0.0
nacos server 3.1.1

[uuuyuqi]

看起来需要升级 sca 2025.0.0 的 nacos client 版本来解决这个问题，可以参考 2025.1.x 中曾经提交过的一个 PR：https://github.com/alibaba/spring-cloud-alibaba/pull/4204/changes

[fenston]

看起来需要升级 sca 2025.0.0 的 nacos client 版本来解决这个问题，可以参考 2025.1.x 中曾经提交过的一个 PR：https://github.com/alibaba/spring-cloud-alibaba/pull/4204/changes

亲测可用，升级后报错消失

[Senrian]

PR Available

I have submitted a fix for this issue. The root cause is a race condition during shutdown:

1. When Spring context closes, NacosGracefulShutdownDelegate (which listens for ContextClosedEvent) calls autoServiceRegistration.stop()
2. This internally deregisters subscribers from Nacos NotifyCenter
3. But if the Nacos client shutdown hooks have already destroyed NotifyCenter.INSTANCE, you get:

   NullPointerException: Cannot read field "sharePublisher" because "NotifyCenter.INSTANCE" is null
   

Fix: Wrap the stop() call in an inner try-catch to handle this gracefully.

PR: #4283