sandynz opened a new issue #9955:
URL: https://github.com/apache/shardingsphere/issues/9955
## Bug Report
### Which version of ShardingSphere did you use?
5.0.0-RC1-SNAPSHOT, commit: c7ea29693b802cffd29fd5323bf35970434bd353
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy
### Expected behavior
No exception thrown
### Actual behavior
Stack trace:
```
[ShardingSphere-Command-0] o.a.s.p.f.c.CommandExecutorTask - Exception
occur:
java.lang.NullPointerException: null
at
org.apache.shardingsphere.infra.check.SQLCheckEngine.check(SQLCheckEngine.java:49)
at
org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandlerFactory.sqlCheck(TextProtocolBackendHandlerFactory.java:92)
at
org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandlerFactory.newInstance(TextProtocolBackendHandlerFactory.java:78)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.<init>(MySQLComQueryPacketExecutor.java:52)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.MySQLCommandExecutorFactory.newInstance(MySQLCommandExecutorFactory.java:73)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.MySQLCommandExecuteEngine.getCommandExecutor(MySQLCommandExecuteEngine.java:60)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:92)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:71)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
### Reason analyze (If you can)
`backendConnection.getSchemaName()` is null, which cause related
`shardingSphereMetaData` still null
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
1, Enable governance in `server.yaml`
2, Clean configuration, include `config-sharding.yaml` and remote
configuration in ZooKeeper governance_ds
3, Client connect to proxy, run `show databases;` or `CREATE DATABASE
sharding_db;`
### Example codes for reproduce this issue (such as a github link).
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