[jira] [Commented] (DAFFODIL-2579) java compile compatibility issue with Java 16/17

["Steve Lawrence (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DAFFODIL-2579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17438888#comment-17438888 ] 

Steve Lawrence commented on DAFFODIL-2579:
------------------------------------------

I have confirmed that our release candidate container does install Java 8 with no other versions of java in the container. So our official releases should all be Java 8 compatible.

Though, additional javac/scalac options to ensure Java 8 compatibility is still a good idea. Some googling makes be think we need the following in build.sbt, but I haven't confirmed it:
{code:scala}
javacOptions := Seq("-source", "1.8", "-target", "1.8")

scalacOptions := Seq("-target:jvm-1.8")
{code}

> java compile compatibility issue with Java 16/17
> ------------------------------------------------
>
>                 Key: DAFFODIL-2579
>                 URL: https://issues.apache.org/jira/browse/DAFFODIL-2579
>             Project: Daffodil
>          Issue Type: Improvement
>          Components: General
>    Affects Versions: 3.2.0
>            Reporter: Mike Beckerle
>            Priority: Major
>
> When testing the OpenDFDL hexWords example, I got this error message:
> {code}
> [warn] /home/mbeckerle/Documents/dataiti/git/dfdl-schemas/dfdl-examples/hexWords/src/main/java/hexWords/MessageParser.java: /home/mbeckerle/.ivy2/local/org.apache.daffodil/daffodil-japi_2.12/3.2.0-SNAPSHOT/jars/daffodil-japi_2.12.jar(/org/apache/daffodil/japi/ValidationMode.class): major version 61 is newer than 60, the highest major version supported by this compiler.
> {code}
> This appears to be due to the fact that my local snapshot of Daffodil had been compiled using Java 17, but my java-based hexWords application is using Java 16. 
> Recompiling Daffodil with Java 16 fixes this.
> This does suggest that we must compile the Daffodil 3.2.0 distribution with Java 8, or we risk the daffodil libraries being incompatible backward for a user that is still using Java 8. 
> Perhaps we need compilation options on Daffodil so that no matter what JVM/java version you are using, the jar files are backward compatible to Java 8?



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