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https://issues.apache.org/jira/browse/FLINK-10207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593604#comment-16593604
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ASF GitHub Bot commented on FLINK-10207:
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zentol opened a new pull request #6618: [FLINK-10207][build] Bump checkstyle to
8.9
URL: https://github.com/apache/flink/pull/6618
## What is the purpose of the change
This PR bumps the checkstyle version to 8.9, which is a prerequisite for
compiling with java 9.
## Brief change log
* bump version to 8.9
* updated IDE setup docs
* fixed a number of checkstyle violations that weren't detected previously
## Verifying this change
I had to setup a local VM with jdk 9 to encounter the issue and verify the
fix. Travis is unfortunately unreliable for this, as some jdk 9
incompatibilities that I encountered locally didn't occur on travis (which is
actually **very** problematic).
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> Bump checkstyle-plugin to 8.9
> -----------------------------
>
> Key: FLINK-10207
> URL: https://issues.apache.org/jira/browse/FLINK-10207
> Project: Flink
> Issue Type: Sub-task
> Components: Build System
> Affects Versions: 1.7.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.0
>
>
> Our current checkstyle version (8.4) is incompatible with java 9, the
> earliest version to work properly is 8.9.
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