TeslaCN opened a new issue, #23146:
URL: https://github.com/apache/shardingsphere/issues/23146
## Bug Report
### Which version of ShardingSphere did you use?
master - 92f74f008acfe207cee7674a49acb4699173dd5d
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy MySQL
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
```yaml
props:
proxy-frontend-max-connections: 1
```
Connect ShardingSphere-Proxy from 2 clients.
### Expected behavior
The second client got too many connection error.
### Actual behavior
```
wuweijie$ mysql -h 127.0.0.1 -proot --ssl-mode=disable -P13306 -A
mysql: [Warning] Using a password on the command line interface can be
insecure.
ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial
communication packet', system error: 0
```
```
Exception in thread "ShardingSphere-Command-0"
java.lang.NullPointerException: Cannot invoke
"java.util.concurrent.ExecutorService.shutdown()" because "executorService" is
null
at
org.apache.shardingsphere.proxy.frontend.executor.ConnectionThreadExecutorGroup.unregisterAndAwaitTermination(ConnectionThreadExecutorGroup.java:84)
at
org.apache.shardingsphere.proxy.frontend.netty.FrontendChannelInboundHandler.closeAllResources(FrontendChannelInboundHandler.java:102)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
```
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