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https://issues.apache.org/jira/browse/SUREFIRE-1652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822339#comment-16822339
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Tibor Digana commented on SUREFIRE-1652:
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I don't think that this is our fault because argLine is very often used, and
this project example does not have any tests.
The problem is with the design of Java because the class version is changed
upon the attribute {{--enable-preview}}. This has never happened before in the
history of Java and it is a bug in Oracle who designed Java which allows
breaking backwards compatibility still using the same JDK 12.
To come over this issue use this command {{mvn test}} with VM Options
{{--enable-preview}}. Set environment variable {{MAVEN_OPTS=--enable-preview}}.
> 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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