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https://issues.apache.org/jira/browse/GROOVY-9666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17168285#comment-17168285
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Paul King commented on GROOVY-9666:
-----------------------------------
Yes, some changes were made to ModuleNode which we'll likely roll back.
Workaround is simply to make a copy of the collection before iterating over it.
That shouldn't be needed from 3.0.6 in a couple of weeks (guess at release
date).
> ConcurrentModificationException with ASTTransformation
> ------------------------------------------------------
>
> Key: GROOVY-9666
> URL: https://issues.apache.org/jira/browse/GROOVY-9666
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 3.0.5
> Reporter: André Filipe Aloise
> Priority: Major
> Fix For: 3.0.6
>
> Attachments: image-2020-07-28-14-00-04-584.png
>
>
> Until 3.0.4 the following class had no errors
> [https://github.com/vert-x3/vertx-lang-groovy/blob/3.9/vertx-lang-groovy-gen/src/main/java/io/vertx/lang/groovy/VertxTransformation.java]
> Since 3.0.5 it started to throw a ConcurrentModificationException
> !image-2020-07-28-14-00-04-584.png!
> Here's the following travis build link of each version.
> [https://travis-ci.org/github/vert-x3/vertx-lang-groovy/builds/712642226]
> (Builds Ok, using 3.0.4)
> [https://travis-ci.org/github/aaloise/vertx-lang-groovy/builds/712638741]
> (Throws the ConcurrentModificationException when visit methos is called,
> using 3.0.5)
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