Re: NullPointerException - explanation? (Solved)

[rob <ro...@softhome.net>]

Foolish logic in the action.

rob wrote:
> I'm receiving a NullPointerException while trying to use <nested:nest
> (and other nested tags) I'm confused about why the error is occuring,
> perhaps someone could explain where I've gone wrong.
> 
> I basically have a form that looks a little something like this.
> 
> public class Form
> {
>     private Collection c = new ArrayList();
> 
> public Collection getList() { return c; }
> 
> }
> 
> and the .jsp looks like this and I've shown all struts tags use. (I'm
> aware that there would be no actual output from this) I've trimmed it
> down to eliminate the suggestion that some other tags are causing my
> problem.
> 
> <html:form action="listaction">
> <nested:nest property="list">
> </nested:nest>
> </html:form>
> 
> When I go to load the list.jsp I receive JasperException with the root
> cause being a NullPointerException.
> 
> java.lang.NullPointerException:
>     at 
> org.apache.struts.taglib.nested.NestedPropertyHelper.getNestedProperty(NestedPropertyHelper.java:174) 
> 
> .
> .
> .
> 
> Any suggestions?
> 
> Thanks
> 
> Rob
> 
> 
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