[GROOVY-9069] assignment in map by named index causes casting error

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 2.5.6
• Component/s: groovy-runtime
• Environment: Linux Mint 19.1
• Assignee: Unassigned
• Reporter: Ryan Vanderwerf
• Created: 05/Apr/19 14:51
• Updated: 02/May/21 13:26
• Resolved: 02/May/21 13:26

Description

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.

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
    }
}

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.