dongjoon-hyun opened a new pull request #27242: [SPARK-30534][INFRA] Use mvn in `dev/scalastyle` URL: https://github.com/apache/spark/pull/27242 ### What changes were proposed in this pull request? This PR aims to use `mvn` instead of `sbt` in `dev/scalastyle` to recover GitHub Action. ### Why are the changes needed? As of now, Apache Spark sbt build is broken by the Maven Central repository policy. https://stackoverflow.com/questions/59764749/requests-to-http-repo1-maven-org-maven2-return-a-501-https-required-status-an > Effective January 15, 2020, The Central Maven Repository no longer supports insecure > communication over plain HTTP and requires that all requests to the repository are > encrypted over HTTPS. We can reproduce this locally by the following. ``` $ rm -rf ~/.m2/repository/org/apache/apache/18/ $ build/sbt clean ``` And, in GitHub Action, `lint-scala` is the only one which is using `sbt`. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? First of all, GitHub Action should be recovered. Also, manually, do the following. **Without Scalastyle violation** ``` $ dev/scalastyle OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=384m; support was removed in 8.0 Using `mvn` from path: /usr/local/bin/mvn Scalastyle checks passed. ``` **With Scalastyle violation** ``` $ dev/scalastyle OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=384m; support was removed in 8.0 Using `mvn` from path: /usr/local/bin/mvn Scalastyle checks failed at following occurrences: error file=/Users/dongjoon/PRS/SPARK-HTTP-501/core/src/main/scala/org/apache/spark/SparkConf.scala message=There should be no empty line separating imports in the same group. line=22 column=0 error file=/Users/dongjoon/PRS/SPARK-HTTP-501/core/src/main/scala/org/apache/spark/SparkConf.scala message=There should be no empty line separating imports in the same group. line=35 column=0 ```
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