zjffdu commented on pull request #4119:
URL: https://github.com/apache/zeppelin/pull/4119#issuecomment-841598895
Not sure whether this is the root cause. According the javadoc of
Context#close, it looks like even close is not called, it would be released.
```
/**
* Closes this context.
* This method releases this context's resources immediately, instead of
* waiting for them to be released automatically by the garbage
collector.
*
* <p> This method is idempotent: invoking it on a context that has
* already been closed has no effect. Invoking any other method
* on a closed context is not allowed, and results in undefined
behaviour.
*
* @throws NamingException if a naming exception is encountered
*/
public void close() throws NamingException;
```
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