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https://issues.apache.org/jira/browse/ECS-1?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mauro Manfrin updated ECS-1:
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Attachment: secondConcreteElement.zip
> addElement(Element element) methods can fail
> --------------------------------------------
>
> Key: ECS-1
> URL: https://issues.apache.org/jira/browse/ECS-1
> Project: ECS
> Issue Type: Bug
> Environment: in Ibm Virtual Machines, but probabily also in Sun
> Virtual Machines
> Reporter: Mauro Manfrin
> Assignee: Robert Burrell Donkin
> Priority: Critical
> Attachments: ecs-maintrunk-patches.zip, secondConcreteElement.zip
>
>
> The class ConcreteElement exposes a method
> addElement(Element element)
> that calls
> addElementToRegistry(Integer.toString(element.hashCode()),element);
> so it gives a key valued element.hashCode() to that element.
> That's the point: element.hashCode() can't be a unique key because sometimes
> we can have two elements with the same hasocode.
> javadoc states:
> "It is not required that if two objects are unequal according to the
> equals(java.lang.Object) method, then calling the hashCode method on each of
> the two objects must produce distinct integer results. However, the
> programmer should be aware that producing distinct integer results for
> unequal objects may improve the performance of hashtables."
> So sometimes, two different objects can have the same hashCode!
> So, sometimes two calls to addElement(element) can result in only the second
> object stored in the ConcreteElement.
> So sometimes, on out instalaltion some table rows misses, or some row cells
> misses or...
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