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https://issues.apache.org/jira/browse/COLLECTIONS-394?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Neidhart updated COLLECTIONS-394:
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Fix Version/s: (was: 4.0)
> FastTreeMap is not compatible with TreeMap
> ------------------------------------------
>
> Key: COLLECTIONS-394
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-394
> Project: Commons Collections
> Issue Type: Bug
> Components: Map
> Affects Versions: 3.2.1
> Environment: all
> Reporter: Michael Pradel
>
> FastTreeMap extends TreeMap in a way that doesn't preserve the superclass
> behavior. For example, the following code prints 'null', but I would expect
> it to print '1=1', which is what TreeMap does:
> TreeMap map = new FastTreeMap();
> //TreeMap map = new TreeMap();
> map.put(1, "1");
> map.put(3, "3");
>
> Entry e = map.floorEntry(2);
> System.out.println(e);
> This behavior is surprising and can hit you every time a reference of type
> TreeMap refers to an instance of FastTreeMap. A subclass instance used
> through a superclass interface shouldn't change the visible behavior of its
> superclass.
> The reason for this problem seems to be that FastTreeMap both extends TreeMap
> and delegates to a TreeMap via the 'map' field. I.e., there are two map
> instances for a single FastTreeMap instance.
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