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https://issues.apache.org/jira/browse/GROOVY-7974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-7974.
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> Null operation in addition fails with Ambiguous method overloading despite
> cast
> -------------------------------------------------------------------------------
>
> Key: GROOVY-7974
> URL: https://issues.apache.org/jira/browse/GROOVY-7974
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.7
> Reporter: Lucian Chirita
> Assignee: Jochen Theodorou
> Attachments: A.groovy
>
>
> Doing something like 5 + (n as Number) where Object n = null fails with
> {noformat}
> Ambiguous method overloading for method java.lang.Integer#plus.
> Cannot resolve which method to invoke for [null] due to overlapping
> prototypes between:
> [class java.lang.Character]
> [class java.lang.String]
> [class java.lang.Number]
> {noformat}
> A similar call works when you have a regular method overloaded for Character,
> String and Number.
> Also, trying to do 5.plus(n as Number) fails with
> {noformat}
> java.lang.ClassCastException:
> org.codehaus.groovy.runtime.wrappers.PojoWrapper cannot be cast to
> java.lang.Number
> {noformat}
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