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https://issues.apache.org/jira/browse/MINVOKER-274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277496#comment-17277496
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Bertrand Martin commented on MINVOKER-274:
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Suggestion: Use [groovysh|https://groovy-lang.org/groovysh.html] to run
*verify.groovy*, so there is no conflict with the current JVM and whatever
dependencies are loaded by the project being tested with maven-invoker-plugin.
> Use Groovy 3.x to prevent Java9+ warnings about Groovy 2.x using illegal
> reflection
> -----------------------------------------------------------------------------------
>
> Key: MINVOKER-274
> URL: https://issues.apache.org/jira/browse/MINVOKER-274
> Project: Maven Invoker Plugin
> Issue Type: Improvement
> Environment: JDK9+
> Reporter: Bertrand Martin
> Priority: Major
> Labels: Java8
>
> h1. Problem
> Running integration tests with *maven-invoker-plugin* in JDK with version >=
> 9 (incl. OpenJDK 11, 14, 15, etc.) will generate these un-aesthetic messages:
> {noformat}
> [INFO] run post-build script verify.groovy
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by
> org.codehaus.groovy.reflection.CachedClass
> (file:/d:/Dev2/maven/repository/org/codehaus/groovy/groovy-all/2.4.8/groovy-all-2.4.8.jar)
> to method java.lang.Object.clone()
> WARNING: Please consider reporting this to the maintainers of
> org.codehaus.groovy.reflection.CachedClass
> WARNING: Use --illegal-access=warn to enable warnings of further illegal
> reflective access operations
> WARNING: All illegal access operations will be denied in a future release
> {noformat}
> h1. Specification
> Use Groovy 3.x which solved all illegal accesses that were in 2.x.
> Most current version is:
> {code:xml}
> <groupId>org.codehaus.groovy</groupId>
> <artifactId>groovy-all</artifactId>
> <version>3.0.7</version>
> <type>pom</type>
> </dependency>
> {code}
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