Github user Leemoonsoo commented on the issue:
https://github.com/apache/zeppelin/pull/1015
`handleException()` take screenshot. `ParagraphActionIT` catches all
exceptions during test and call `handleException()` to screenshot.
To take screenshot manually, Insert following line where you want,
```java
try { handleException("ANY MSG", new RuntimeException();} catch (Exception
e) {};
```
I was working on #1034, it does not fix all the selenium error, but it
fixes all errors on `ZeppelinIT`.
Please take a look and feel free to merge #1034.
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