[GitHub] aljoscha opened a new pull request #6784: [FLINK-7811] Add support for Scala 2.12

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aljoscha opened a new pull request #6784: [FLINK-7811] Add support for Scala 2.12
URL: https://github.com/apache/flink/pull/6784
 
 
   This is the first batch of changes on the way to Scala 2.12 support. All these changes are necessary to make the Scala 2.12 compiler happy and I also updated the `ClosureCleaner` to be able to work with Scala 2.12.
   
   This does not yet change the Scala version to 2.12 but I have a work-in-progress branch that does that and these changes are the first batch of changes that are valid both for Scala 2.11 and necessary for Scala 2.12.
   
   This adds a dependency:
   ```
   <!-- This artifact is a shaded version of ASM 6.x. The POM that was used to produce this
   is at https://github.com/apache/geronimo-xbean/tree/trunk/xbean-asm6-shaded
   For context on why we shade ASM, see SPARK-782 and SPARK-6152. -->
   <dependency>
       <groupId>org.apache.xbean</groupId>
       <artifactId>xbean-asm6-shaded</artifactId>
       <version>4.8</version>
   </dependency>
   ```
   
   It's required to make the ClosureCleaner work with Scala 2.12 lambdas. It's convenient because it's already there but we can also make our own `flink-shaded` release of ASM 6.

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