menghaoranss opened a new issue #10339:
URL: https://github.com/apache/shardingsphere/issues/10339
1. use database test
2. drop database test
3. show databases
```
java.lang.NullPointerException: null
at
org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandlerFactory.getBackendDatabaseType(TextProtocolBackendHandlerFactory.java:97)
at
org.apache.shardingsphere.proxy.backend.text.TextProtocolBackendHandlerFactory.newInstance(TextProtocolBackendHandlerFactory.java:76)
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)
```
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