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https://issues.apache.org/jira/browse/COLLECTIONS-265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Yandell updated COLLECTIONS-265:
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Attachment: COLLECTIONS-265.patch
Attaching a test/patch for comments.
Throws an IllegalArgumentException if comparator() returns null and the object
is not Comparable.
> TreeBag allows uncomparable item to be added, breaking toString
> ---------------------------------------------------------------
>
> Key: COLLECTIONS-265
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-265
> Project: Commons Collections
> Issue Type: Bug
> Components: Bag
> Affects Versions: 3.2
> Reporter: David Saff
> Priority: Minor
> Fix For: 3.3
>
> Attachments: COLLECTIONS-265.patch, TreeBag.pat
>
>
> The following code throws an exception not when the Object is added, but when
> toString is called:
> TreeBag bag = new TreeBag();
> bag.add(new Object());
> bag.toString();
> Trace:
> java.lang.ClassCastException: java.lang.Object
> at java.util.TreeMap.compare(TreeMap.java:1093)
> at java.util.TreeMap.getEntry(TreeMap.java:347)
> at java.util.TreeMap.get(TreeMap.java:265)
> at
> org.apache.commons.collections.bag.AbstractMapBag.getCount(AbstractMapBag.java:116)
> at
> org.apache.commons.collections.bag.AbstractMapBag.toString(AbstractMapBag.java:581)
> [...]
> In a client program, toString should never throw an exception--it makes
> debugging much harder, for one thing. I believe that TreeBag should defend
> against the addition of uncomparable objects, so that toString will never
> throw an exception.
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