[displaytag-user] NullPointerException when export is true

[Claudio Sanchez]

Hello, I'm using last snapshot (Feb 4, 2004) and I get the following 
exception when I try to display a table with export=true:

java.lang.NullPointerException
	at org.displaytag.util.Href.toString(Href.java:224)
	at 
org.displaytag.tags.TableTag.getSearchResultAndNavigation(TableTag.java:1496)
	at org.displaytag.tags.TableTag.getHTMLData(TableTag.java:1128)
	at org.displaytag.tags.TableTag.doEndTag(TableTag.java:874)
	at org.apache.jsp.userList_jsp._jspService(userList_jsp.java:263)

I have debbuged and I have found a problem in toString method in Href class.

Set parameterSet = this.parameters.entrySet();
Iterator iterator = parameterSet.iterator();
while (iterator.hasNext())
{
   Map.Entry entry = (Map.Entry) iterator.next();
   Object key = entry.getKey();
   Object value = entry.getValue();
   if (value.getClass().isArray())
   .....
}
When value is null the NullPointerException is throw.

When export is true I have a null value, the key is d-xxxx-xo, I noticed 
that this parameter is for sorting.
But if export is false, this parameter, and others like d-xxxx-xs or 
d-xxxx-e, are not in parameterSet so I don't get the exception.

For now I have fixed the problem checking for null value:
if ((value != null) && (value.getClass().isArray()))
Thanks, Claudio

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