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https://issues.apache.org/jira/browse/DAFFODIL-2579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17450530#comment-17450530
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Steve Lawrence commented on DAFFODIL-2579:
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Note that newer versions of javac have a {{--release}} option which can be used
to fix this issue.
https://stackoverflow.com/questions/43102787/what-is-the-release-flag-in-the-java-9-compiler#answer-43103038
Unfortunately, scalac does not have a similar option.
> 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
> Assignee: Steve Lawrence
> Priority: Major
> Fix For: 3.2.0
>
>
> 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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