yaooqinn opened a new issue #821:
URL: https://github.com/apache/incubator-kyuubi/issues/821
### 1. Describe the bug
<!-- A clear and concise description of what the bug is. -->
Improper exception for closing a non-existent session
```
org.apache.kyuubi.KyuubiSQLException: Invalid SessionHandle
[93904f38-0dcc-478a-8a39-1e7647a18677]
at
org.apache.kyuubi.KyuubiSQLException$.apply(KyuubiSQLException.scala:68)
at
org.apache.kyuubi.session.SessionManager.closeSession(SessionManager.scala:70)
at
org.apache.kyuubi.service.AbstractBackendService.closeSession(AbstractBackendService.scala:49)
at
org.apache.kyuubi.service.FrontendService$FeTServerEventHandler.deleteContext(FrontendService.scala:527)
at
org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:300)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
if the session being requested to close is null, we only need a warning here
### 2. Environments
#### 2.1 Versions
- Kyuubi
- [ ] 1.1.0
- [ ] 1.0.3
- [ ] 0.8.x and earlier <!-- Please update Kyuubi, versions of 0.x are no
longer supported by the community -->
- Spark
- [ ] 3.1.x
- [ ] 3.0.x
- [ ] 2.4.x and earlier <!-- Please update Spark, versions of 2.x are no
longer supported by the community -->
#### 2.2 Kyuubi Configurations
#### 2.3 Spark Configurations
### 3. Steps to reproduce
#### 3.1 Operations
#### 3.2 Expected behavior
<!-- A clear and concise description of what you expected to happen. -->
#### 3.3 Actual behavior
### 4. Additional context
#### 4.1 Log of the server
#### 4.2 Log of the corresponding engine
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