Error occurred while performing Nacos client graceful shutdown

[Comven]

SCA 2025.0.0.0 version reports an error when closing or restarting the program

[2025-10-20 10:48:19,276][ERROR] [479532] - c.a.c.n.r.NacosGracefulShutdownDelegate  [  79]: 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:1163)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.doClose(ServletWebServerApplicationContext.java:179)
	at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:1126)
	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:833)

[lltx]

是的这里需要 nacos 3.1.0 修复这个问题

[Comven]

是的这里需要 nacos 3.1.0 修复这个问题

nacos-client吗？

[uuuyuqi]

Thanks for the discussion. As lltx has noted, this issue can be resolved by upgrading the Nacos client version. The root cause is straightforward; please refer to this GitHub issue for details: Error occurred while performing Nacos client graceful shutdown #4081. Contributions are welcome—feel free to submit a PR to the SCA 2025.1.x branch to address it. 😄

[fenston]

Thanks for the discussion. As lltx has noted, this issue can be resolved by upgrading the Nacos client version. The root cause is straightforward; please refer to this GitHub issue for details: Error occurred while performing Nacos client graceful shutdown #4081. Contributions are welcome—feel free to submit a PR to the SCA 2025.1.x branch to address it. 😄感谢你的讨论。正如 lltx 所指出的，这个问题可以通过升级 Nacos 客户端版本来解决。根本原因很简单;详情请参阅 GitHub 相关问题：在执行 Nacos 客户端优雅关机时发生错误#4081。 欢迎投稿——欢迎提交永久居民申请，提交给 SCA 2025.1.x 分支以处理此事。😄

这个不打算在2025.0.分支处理么？

[uuuyuqi]

Thanks for the discussion. As lltx has noted, this issue can be resolved by upgrading the Nacos client version. The root cause is straightforward; please refer to this GitHub issue for details: Error occurred while performing Nacos client graceful shutdown #4081. Contributions are welcome—feel free to submit a PR to the SCA 2025.1.x branch to address it. 😄感谢你的讨论。正如 lltx 所指出的，这个问题可以通过升级 Nacos 客户端版本来解决。根本原因很简单;详情请参阅 GitHub 相关问题：在执行 Nacos 客户端优雅关机时发生错误#4081。 欢迎投稿——欢迎提交永久居民申请，提交给 SCA 2025.1.x 分支以处理此事。😄

这个不打算在2025.0.分支处理么？

会处理的，2025.0 会作为 springboot3.x 的长期支持分支。这个没合并是想作为 good first issue 让社区来贡献，如果后续再没有开发者提交的话，我们会在下次发版本前修复并提交进去

[Senrian]

PR Available

Same root cause as #4247. Fixed in:
#4283

The race condition: when Spring context closes, NacosGracefulShutdownDelegate tries to call stop() which deregisters from NotifyCenter, but NotifyCenter.INSTANCE may already be null if Nacos shutdown hooks ran first.