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https://jira.codehaus.org/browse/MINVOKER-182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=363317#comment-363317
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Andrew Schurman commented on MINVOKER-182:
------------------------------------------
As a not-so-nice workaround, one can add a test-scoped version of groovy that
invoker is using to swap out the groovy version of the dependency. This won't
help if you do depend on API in that version of groovy which is missing from
the one invoker is using.
> Different groovy versions on test classpath can cause ClassCastException
> ------------------------------------------------------------------------
>
> Key: MINVOKER-182
> URL: https://jira.codehaus.org/browse/MINVOKER-182
> Project: Maven Invoker Plugin
> Issue Type: Bug
> Affects Versions: 1.8
> Reporter: Andrew Schurman
> Priority: Minor
>
> When {{addTestClassPath}} is set and you have a different version of groovy
> than invoker on your classpath, you will run into {{ClassCastException}} when
> pre-/post- build hooks are run for tests. This occurs due to invoker creating
> groovy scripts in its version of groovy, but using a different version of
> groovy as the runtime (since test classpath elements are loaded first when
> {{addTestClassPath=true}}).
> In my specific case, I had a transitive dependency on groovy 1.7, but invoker
> uses groovy 2.0. Being transitive does make it harder to spot, but
> more importantly you may not have access to the dependency that depends on
> groovy. This could make swapping groovy versions impossible depending on the
> gap between versions.
> Stack trace:
> {code}
> groovy.lang.GroovyRuntimeException: Failed to create Script instance for
> class: class Script1. Reason: java.lang.ClassCastException: Script1 cannot be
> cast to groovy.lang.GroovyObject
> at
> org.codehaus.groovy.runtime.InvokerHelper.createScript(InvokerHelper.java:443)
> at groovy.lang.GroovyShell.parse(GroovyShell.java:625)
> at groovy.lang.GroovyShell.evaluate(GroovyShell.java:516)
> at groovy.lang.GroovyShell.evaluate(GroovyShell.java:556)
> at groovy.lang.GroovyShell.evaluate(GroovyShell.java:527)
> at
> org.apache.maven.shared.scriptinterpreter.GroovyScriptInterpreter.evaluateScript(GroovyScriptInterpreter.java:83)
> at
> org.apache.maven.shared.scriptinterpreter.ScriptRunner.executeRun(ScriptRunner.java:249)
> at
> org.apache.maven.shared.scriptinterpreter.ScriptRunner.run(ScriptRunner.java:177)
> at
> org.apache.maven.plugin.invoker.AbstractInvokerMojo.runBuild(AbstractInvokerMojo.java:1692)
> at
> org.apache.maven.plugin.invoker.AbstractInvokerMojo.runBuild(AbstractInvokerMojo.java:1360)
> at
> org.apache.maven.plugin.invoker.AbstractInvokerMojo.runBuilds(AbstractInvokerMojo.java:1210)
> at
> org.apache.maven.plugin.invoker.AbstractInvokerMojo.execute(AbstractInvokerMojo.java:723)
> at
> org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
> at
> org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
> at
> org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
> at
> org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
> at
> org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
> Caused by: java.lang.ClassCastException: Script1 cannot be cast to
> groovy.lang.GroovyObject
> at
> org.codehaus.groovy.runtime.InvokerHelper.createScript(InvokerHelper.java:421)
> ... 32 more
> {code}
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