commit 0f9a1a80c76054c322e2d1768cf24a3e4bd49496
author Jongyoul Lee <jongyoul@gmail.com> Wed Jul 11 16:16:43 2018 +0900
committer Jongyoul Lee <jongyoul@apache.org> Thu Jul 12 13:43:33 2018 +0900
tree 7e8bd0ca93549c579dda0fd3ecaedaa237946a92
parent 1ac0e2f0086b7da5b7149562f2db8647c3b711c9

[ZEPPELIN-3600] Add REST API to change logger level dynamically

### What is this PR for?
Enabling users to change the level of a specific logger to investigate Zeppelin server's status.

### What type of PR is it?
[Feature]

### Todos
* [x] - Add api to change the level of logger
* [x] - Add exception handler

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-3600

### How should this be tested?
1. http --session ~/session.txt --form POST http://localhost:8080/api/login userName=admin password=password1
1. http --session ~/session.txt POST http://localhost:8080/api/admin name=org.apache.zeppelin.rest.AdminRestApi level=DEBUG

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? May be

Author: Jongyoul Lee <jongyoul@gmail.com>

Closes #3060 from jongyoul/ZEPPELIN-3600 and squashes the following commits:

618f76074 [Jongyoul Lee] Add admin permisson to aceess /api/admin/** Change error message clearly to show a specific problem
04308bd75 [Jongyoul Lee] Change `Preconditions` to a self-check logic to throw BadRequestException Add `WebApplicationExceptionMapper` to the server Implement `ExceptionSerializer` for gson Implement `WebApplicationExceptionMapper`
5127d89b4 [Jongyoul Lee] Add api to show all loggers' name and level Add api to show a specific logger's name and level Add api to change a logger's level