htynkn opened a new pull request #1556: [Dubbo-1513] add checkstyle with basic rule URL: https://github.com/apache/incubator-dubbo/pull/1556 ## What is the purpose of the change Add checkstyle plugin. Apply some basic checkstyle rule like AvoidStarImport,OuterTypeFilename. Also add file header check for Apache License. Close #1513 ## Brief changelog Apply checkstyle maven plugin in parent pom file. Only active in jdk 1.8 and above. `checkstyle-header.txt` is header file which every file should has it. There are some rule should apply according to https://github.com/apache/incubator-dubbo/blob/master/CONTRIBUTING.md#code-conventions for example. line length must less than 120. But current files need fix. There are too many work for this. We can have separate task for them later. ## Verifying this change CI Pass Follow this checklist to help us incorporate your contribution quickly and easily: - [x] Make sure there is a [GITHUB_issue](https://github.com/alibaba/dubbo/issues) filed for the change (usually before you start working on it). Trivial changes like typos do not require a GITHUB issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue. - [x] Format the pull request title like `[Dubbo-XXX] Fix UnknownException when host config not exist`. Each commit in the pull request should have a meaningful subject line and body. - [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why. - [x] Run `mvn clean install -DskipITs` to make sure unit-test pass. Run `mvn clean test-compile failsafe:integration-test` to make sure integration-test pass. - [x] If this contribution is large, please file an [Apache Individual Contributor License Agreement](http://www.apache.org/licenses/#clas).
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