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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 closed COLLECTIONS-265.
-------------------------------------

    Resolution: Fixed

svn ci -m "Applying my patch from COLLECTIONS-265. TreeBag no longer accepts 
non-Comparable classes when it naturally ordered (ie: no comparator has been 
set)" src

Sending        src/java/org/apache/commons/collections/TreeBag.java
Sending        src/java/org/apache/commons/collections/bag/TreeBag.java
Sending        src/test/org/apache/commons/collections/TestTreeBag.java
Sending        src/test/org/apache/commons/collections/bag/TestTreeBag.java
Transmitting file data ....
Committed revision 641166.

> 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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