[jira] [Commented] (SUREFIRE-1459) mvn+java7 and POM with toolchains targeting java8 fail in surefire plugin

["Markus Kopp (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SUREFIRE-1459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17279737#comment-17279737 ] 

Markus Kopp commented on SUREFIRE-1459:
---------------------------------------

This also affects java8 configured in path and java11 configured with toolchain plugin and on Linux.

> mvn+java7 and POM with toolchains targeting java8 fail in surefire plugin
> -------------------------------------------------------------------------
>
>                 Key: SUREFIRE-1459
>                 URL: https://issues.apache.org/jira/browse/SUREFIRE-1459
>             Project: Maven Surefire
>          Issue Type: Improvement
>          Components: Maven Surefire Plugin
>    Affects Versions: 2.20.1
>         Environment: Maven 3.3.9 started with JDK 7
> (on Windows Server 2012)
>            Reporter: Rüdiger Groß-Hardt
>            Assignee: Tibor Digana
>            Priority: Major
>              Labels: toolchains
>         Attachments: run-with-errors.txt, surefire-1459.zip
>
>
> We compile and test with a POM using a toolchain configuration targeting JDK 8. Maven itself runs with JDK 7. If we run tests with the maven-surefire-plugin and forkCount=1 and reuseForks=false the build fails with 
> _java.lang.UnsupportedClassVersionError: SomeTestClass : Unsupported major.minor version 52.0_
> If we set reuseForks=true, it builds fine. Other combinations seem to fail, if the plugin code running in the JDK 7 context presumably needs to use reflections to enumerate test classes.
> As newbies to toolchains, we were assuming, that toolchains enabled us to effectively decouple the JDK version used to run maven from the JDK version used to run the tests. 
> This problem took us quite some time to solve. As an improvement I would suggest a meaningful warning or error message stating that the surefire plugin must be run with a JDK version higher than or equal to the version of the target JDK from the toolchain configuration. 



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