Reamer opened a new pull request #4217:
URL: https://github.com/apache/zeppelin/pull/4217
### What is this PR for?
This PR is using normal java 8 features to reduce the usage of thrid-party
dependecies.
examples:
guava Joiner -> String.join
guava Lists.newArrayList(...) -> Arrays.asList(...)
guava Sets.newHashSet(...) -> new HashSet<>(Arrays.asList(...))
guava Lists.newArrayList() -> new ArrayList<>();
....
### What type of PR is it?
-Refactoring
### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-5514
### How should this be tested?
* via CI
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No
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