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https://issues.apache.org/jira/browse/COLLECTIONS-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644858#action_12644858
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Henri Yandell commented on COLLECTIONS-299:
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Interestingly this mimics the same issue in java.util.Properties. If you pass a
value into its Properties(Properties) constructor then any non-String values
are lost. I think the javadoc route is probably best here - especially as the
getProperty to get change makes tests fail.
> ExtendedProperties.convertProperties loses non-String values
> ------------------------------------------------------------
>
> Key: COLLECTIONS-299
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-299
> Project: Commons Collections
> Issue Type: Bug
> Components: Core
> Reporter: Simon Kitching
> Fix For: 3.3
>
>
> A Properties object normally has Strings as its values. But it does partially
> support non-String-typed values via the raw put and get methods inherited
> from Hashtable. And other Properties methods are aware that the value might
> not be a String; see documentation for methods propertyNames() and
> stringPropertyNames() for example.
> ExtendedProperties.convertProperties does this:
> {code}
> for (Enumeration e = props.propertyNames(); e.hasMoreElements();) {
> String s = (String) e.nextElement();
> c.setProperty(s, props.getProperty(s));
> }
> {code}
> Properties.propertyNames() returns the names of all keys in the set,
> regardless of the associated value's type. But Properties.getProperty(key)
> returns null if the value type is not a String. The call to c.setProperty
> invokes setPropertyInternal, which can pass this null value to Hashtable.put,
> which then throws a NullPointerException.
> It's rather puzzling to have a valid (string-key, non-string-value) entry in
> the Properties object and get a NullPointerException.
> Perhaps the call
> props.getProperty(s)
> can be changed to
> props.get(s)
> Alternately, at least documenting that this method does not support
> non-string values in the input Properties object would be useful.
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