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https://issues.apache.org/jira/browse/GROOVY-9575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-9575.
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> ASTNode.hashCode violates Object.hashCode contract: does not return
> consistent value
> ------------------------------------------------------------------------------------
>
> Key: GROOVY-9575
> URL: https://issues.apache.org/jira/browse/GROOVY-9575
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 3.0.4
> Reporter: Anders Wallgren
> Assignee: Daniel Sun
> Priority: Major
> Fix For: 4.0.0-alpha-1, 3.0.5
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> While upgrading groovy from 2.4.18 to 3.0.4 in a project we ran into a
> problem: ASTNode.hashCode uses mutable properties of the object to calculate
> the hash.
> Those object properties are not, however, used when equals() is invoked on an
> ASTNode instance (as of 3.0.4 ASTNode does not implement equals).
> This means ASTNode violates an important part of the Object.hashCode contract
> and you cannot safely put ASTNode instances into collections where the
> hashcode is relied upon to be consistent.
> Quoting the Object.hashCode javadoc:
> * Whenever it is invoked on the same object more than once during an
> execution of a Java application, the {{hashCode}} method must consistently
> return the same integer, provided no information used in {{equals}}
> comparisons on the object is modified. This integer need not remain
> consistent from one execution of an application to another execution of the
> same application.
>
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