zfkun opened a new issue #1014:
URL: https://github.com/apache/dubbo-go/issues/1014
**What happened**:
consumer (go) 运行调用时若 provider (java) 服务重启 会出现空指针错误引起 panic
**What you expected to happen**:
不产生 panic, 返回 error 即可
**How to reproduce it (as minimally and precisely as possible)**:
- consumer (golang 1.15 & dubbo-go 1.5.5) 单例
- provider (java 11) 单例
- zookeeper (3.6.0)
- server (centos 7.7)
consumer 正常调用 provider 之后，手工仅重启 provider 服务 (kill 进程),
若此时 consumer 继续调用 provider 大概率出现 panic
**Anything else we need to know?**:
错误日志 (部分)
```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x1c pc=0xa334fb]
goroutine 27 [running]:
github.com/apache/dubbo-go/remoting/getty.(*gettyRPCClientPool).get(0x0,
0x0, 0x0, 0x0)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/remoting/getty/pool.go:377
+0x9b
github.com/apache/dubbo-go/remoting/getty.(*gettyRPCClientPool).getGettyRpcClient(0x0,
0xc00022c008, 0x14, 0xc000bdf518, 0x9c3275, 0xc0004c0480)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/remoting/getty/pool.go:362
+0x2f
github.com/apache/dubbo-go/remoting/getty.(*Client).selectSession(0xc0002ae840,
0xc00022c008, 0x14, 0xc000000000, 0xc000bdf578, 0x9c2899, 0xc0000981e0, 0x2)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/remoting/getty/getty_client.go:212
+0x4a
github.com/apache/dubbo-go/remoting/getty.(*Client).IsAvailable(0xc0002ae840,
0x10000c000e805e8)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/remoting/getty/getty_client.go:205
+0x3c
github.com/apache/dubbo-go/remoting.(*ExchangeClient).IsAvailable(...)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/remoting/exchange_client.go:175
github.com/apache/dubbo-go/protocol/dubbo.(*DubboInvoker).IsAvailable(0xc000172180,
0xc00016a560)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/protocol/dubbo/dubbo_invoker.go:165
+0x38
github.com/apache/dubbo-go/protocol/protocolwrapper.(*FilterInvoker).IsAvailable(0xc000f32480,
0xc000154600)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/protocol/protocolwrapper/protocol_filter_wrapper.go:110
+0x34
github.com/apache/dubbo-go/cluster/cluster_impl.(*baseClusterInvoker).doSelectInvoker(0xc000172280,
0xd36ce0, 0x11eaa68, 0xd4c300, 0xc000c22580, 0xc000154600, 0x2, 0x2, 0x0, 0x0,
...)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/cluster/cluster_impl/base_cluster_invoker.go:135
+0xc4
github.com/apache/dubbo-go/cluster/cluster_impl.(*baseClusterInvoker).doSelect(0xc000172280,
0xd36ce0, 0x11eaa68, 0xd4c300, 0xc000c22580, 0xc000154600, 0x2, 0x2, 0x0, 0x0,
...)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/cluster/cluster_impl/base_cluster_invoker.go:115
+0x239
github.com/apache/dubbo-go/cluster/cluster_impl.(*failoverClusterInvoker).Invoke(0xc000172280,
0xd45fa0, 0xc0000b6038, 0xd4c300, 0xc000c22580, 0xc0002127a0, 0x74)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/cluster/cluster_impl/failover_cluster_invoker.go:79
+0x2f4
github.com/apache/dubbo-go/common/proxy.(*Proxy).Implement.func1.1(0xc0007a9e60,
0x4, 0x4, 0xc0007a9e60, 0x0, 0xc000e80ca0)
/Users/zfkun/go/pkg/mod/github.com/apache/[email protected]/common/proxy/proxy.go:161
+0x556
reflect.callReflect(0xc0001f4ed0, 0xc000bdfdb8, 0xc000bdfda0)
/usr/local/go/src/reflect/value.go:564 +0x32a
reflect.makeFuncStub(0xd45fa0, 0xc0000b6038, 0xc69930, 0x1, 0xc001098df8,
0x4, 0xc001098e20, 0x6, 0xc00021c300, 0x4, ...)
/usr/local/go/src/reflect/asm_amd64.s:20 +0x42
```
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