“Class already exists” error on Groovy class, repeatedly rewriting module settings from mvn pom

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I can't work out how to permanently get rid of the "class already exists" error in the groovy editor on my groovy class declaration.

I have a multi-module project with many Java projects, and this one maven plugin project with a groovy class.

When I go into the module settings and remove the "target/generated-sources" from the Sources settings, IntelliJ will be happy for a while.

Then at some point, probably after editing the pom, IntelliJ resets the settings and I saw a message saying it's read them all from the pom.

How can I either configure IntelliJ just to stick with my version of the module settings, or how can I configure the maven pom to make the IntelliJ module settings ignore the generated-sources so I don't get that error?

Or is there a different approach? I seriously doubt I have found a bug (in 2018.1.6) but I can't find any solution on the rest of the web.

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Petr Rastegaev
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Does it help if you exclude generated source folder? https://www.jetbrains.com/help/idea/creating-and-managing-modules.html#configuring-content-roots

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Yes, temporarily, but then IntelliJ and Maven will collaborate to break it again when I next edit the pom. This is what happens in the module settings - my original one where I removed the generated-sources dir is backed-up or something similar to "gem-groovy-maven-plugin(1)", to make way for a new one which doesn't seem happy - I've just noticed today that it says it's still loading the gem-groovy-maven-plugin:

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Petr Rastegaev
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In case of maven project, you should exclude it in pom.xml using <exclude> tag.

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Well, I have added an excludes element to the maven-compiler-plugin configuration, assuming that is what you meant. I now have this (using polyglott yaml):

build:
    plugins:
      - artifactId: maven-compiler-plugin
        groupId: org.apache.maven.plugins
        version: 3.6.1
        configuration:
            source: ${maven.compiler.version}
            target: ${maven.compiler.version}
            compilerArgument: -parameters
            debug: true
            debuglevel: lines,vars,source
            includes: [ ${project.basedir}/src/main/groovy/**/* ]
            excludes: [ ${project.build.directory}/generated-sources/**/* ]

It seems to be happy now. Thanks.
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