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https://issues.apache.org/jira/browse/SUREFIRE-2073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17522817#comment-17522817
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Tibor Digana commented on SUREFIRE-2073:
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SUREFIRE-2048 and SUREFIRE-2049 are a prereq for this change.
> Surefire should fork before class scan
> --------------------------------------
>
> Key: SUREFIRE-2073
> URL: https://issues.apache.org/jira/browse/SUREFIRE-2073
> Project: Maven Surefire
> Issue Type: Bug
> Components: JUnit 5.x support
> Affects Versions: 3.0.0-M6
> Reporter: Piotr Karwasz
> Priority: Major
>
> On projects using toolchains submodules can be compiled with a different Java
> version than the main project. This can result in an
> {{UnsupportedClassVersionError}} if the class scan is performed by the main
> Maven JVM:
> {noformat}
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-surefire-plugin:3.0.0-M5:test (test) on
> project log4j-api-java9: Execution test of goal
> org.apache.maven.plugins:maven-surefire-plugin:3.0.0-M5:test failed:
> java.lang.UnsupportedClassVersionError:
> org/apache/logging/log4j/util/java9/ProcessIdUtilTest has been compiled by a
> more recent version of the Java Runtime (class file version 53.0), this
> version of the Java Runtime only recognizes class file versions up to 52.0 ->
> [Help 1]{noformat}
> Therefore Surefire should probably fork a new instance to scan for test
> classes whenever {{forkCount}} is not zero.
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