Rüdiger Groß-Hardt created SUREFIRE-1459:
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Summary: 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
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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