[FLINK-23996] Make Scala 2.12 default build target

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Done
• Component/s: Build System
• Assignee: Unassigned
• Reporter: Danny Cranmer
• Created: 26/Aug/21 12:02
• Updated: 30/Sep/21 10:24
• Resolved: 30/Sep/21 10:24

Description

Background

Flink currently supports Scala 2.11 and 2.12. There is a plan to drop Scala 2.11 support, however in the meantime, 2.11 is the default Scala version.

What

Make Scala 2.12 the default version.

How

• Update pom.xml files to default to Scala 2.12
• Update documentation to reflect this and to instruct how to build Scala 2.11
• Update CI scripts

Issue Links

• relates to: FLINK-20845 Drop support for Scala 2.11