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https://issues.apache.org/jira/browse/GROOVY-9069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16811343#comment-16811343
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Paul King commented on GROOVY-9069:
-----------------------------------
The workaround is probably to remove @CompileStatic. It would be nice to have a
self-contained reproducer.
> assignment in map by named index causes casting error
> -----------------------------------------------------
>
> Key: GROOVY-9069
> URL: https://issues.apache.org/jira/browse/GROOVY-9069
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Affects Versions: 2.5.6
> Environment: Linux Mint 19.1
> Reporter: Ryan Vanderwerf
> Priority: Major
>
> If I assign a value to a collection via a named index (key name) I get a
> casting error like so:
> Failed to convert property value of type {{java.util.LinkedHashMap}} to
> required type {{java.util.Map}} for property {{methodConfigNames}}
> Here is the code in question. This doesn't happen in Groovy 2.4.15. Because
> Grails 4 is running 2.5.6, many plugins are failing with this error.
> {code:java}
> void setMethodConfigNames(Map<String, Map<String, List<String>>>
> methodConfigNames) {
> methodConfigNames.each { String key, Map<String, List<String>> value ->
> Map<String, List<ConfigAttribute>> configs = [:]
> populateMap configs, value
> methodConfigs[key] = configs // fails
> //methodConfigs.put(key,configs) // works
> }
> }
> {code}
> If this could get resolved it would save a lot of plugins from having to be
> re-released with the workaround making less confusion about the error. In
> some cases this works and some it doesn't. Even though I have @CompileStatic
> set, the issue happens at runtime.
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