[jira] Commented: (COLLECTIONS-299) ExtendedProperties.convertProperties loses non-String values

["Henri Yandell (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/COLLECTIONS-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644858#action_12644858 ] 

Henri Yandell commented on COLLECTIONS-299:
-------------------------------------------

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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