Chenxiao Mao created SPARK-26813:
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Summary: Consolidate java version across language compilers and
build tools
Key: SPARK-26813
URL: https://issues.apache.org/jira/browse/SPARK-26813
Project: Spark
Issue Type: Improvement
Components: Build
Affects Versions: 2.4.0
Reporter: Chenxiao Mao
The java version here means versions of javac source, javac target, scalac
target. They could be consolidated as a single version (currently 1.8)
|| ||javac||scalac||
|source|1.8|2.12/2.11|
|target|1.8|1.8|
The current issues are as follows
* Maven defines a single property to specify java version (java.version) while
SBT build defines different properties for javac (javacJVMVersion) and scalac
(scalacJVMVersion). SBT should use a single property as Maven does.
* For SBT build, both javac options and scalac options related to java version
are provided. For Maven build, scala-maven-plugin compiles both Java and Scala
code. However, javac options related to java version (-source, -target) are
provided while scalac options related to java version (-target:TARGET) are not
provided, which means scalac will depend on the default options (jvm-1.8). It's
better for Maven build to explicitly provide scalac options as well.
* Furthermore, it's even better for SBT to refer to java.version defined by
Maven. This is possible since we've already been using sbt-pom-reader.
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