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https://issues.apache.org/jira/browse/SUREFIRE-1652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16804132#comment-16804132
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Steven Schlansker commented on SUREFIRE-1652:
---------------------------------------------
We are able to reproduce this problem in our environment – setting the
forkCount to 0 gets us moving temporarily but sacrifices both speed and test
isolation so is not a real solution.
> surefire/failsafe fails with --enable-preview in java 12
> --------------------------------------------------------
>
> Key: SUREFIRE-1652
> URL: https://issues.apache.org/jira/browse/SUREFIRE-1652
> Project: Maven Surefire
> Issue Type: Bug
> Components: Maven Failsafe Plugin, Maven Surefire Plugin
> Affects Versions: 3.0.0-M3
> Reporter: Krzysztof Krason
> Priority: Blocker
>
> Minimal example: [https://github.com/krzyk/lombok-jdk10-example]
>
> When I run the build `mvn clean verify` in the above repository I get
> following error:
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-surefire-plugin:3.0.0-M3:test (default-test)
> on project lombok-jdk10: Execution default-test of goal
> org.apache.maven.plugins:maven-surefire-plugin:3.0.0-M3:test failed:
> java.lang.UnsupportedClassVersionError: Preview features are not enabled for
> com/kirela/lombok/BarTest (class file version 56.65535). Try running with
> '--enable-preview' -> [Help 1]
>
> Tests work when I remove `--enable-preview` from compiler OR when I remove
> "forkCount" from surefire (and failsafe) configuration.
> As I understand argLine property should be used in all forks, but appears to
> be ignored, there is no difference if I use it as a property or as a
> configuration paramater in surefire/failsafe.
>
> This bug makes using Java 12 with preview features unusable with
> surefire/failsafe.
>
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