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http://www.stripesframework.org/jira/browse/STS-713?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Frederic Daoud closed STS-713.
------------------------------
Resolution: Not a Bug
After some investigation it turns out that a formatter returning null causes
problems in other places as well.
The reason is that Stripes expects a formatter to return a non-null value. This
is (somewhat) stated in the Javadoc for Formatter: "If the value cannot be
formatted because it is an inappropriate type, or because faulty pattern
information was supplied, should fail loudly by throwing a RuntimeException or
subclass thereof." I've added a further note stating that the method should
never return null.
I think this is a valid requirement: asking a formatter to format a value to a
String value, should not return null.
> InputTagSupport.isItemSelected() throws NPE if a Formatter returns null
> -----------------------------------------------------------------------
>
> Key: STS-713
> URL: http://www.stripesframework.org/jira/browse/STS-713
> Project: Stripes
> Issue Type: Bug
> Components: Tag Library
> Affects Versions: Release 1.5.1
> Reporter: Niels Godfredsen
> Assignee: Frederic Daoud
> Priority: Minor
>
> I encountered the follow exception when using a <stripes:option /> tag in a
> JSP:
> java.lang.NullPointerException
>
> net.sourceforge.stripes.tag.InputTagSupport.isItemSelected(InputTagSupport.java:218)
>
> net.sourceforge.stripes.tag.InputSelectTag.isOptionSelected(InputSelectTag.java:107)
>
> net.sourceforge.stripes.tag.InputOptionTag.doEndInputTag(InputOptionTag.java:125)
>
> net.sourceforge.stripes.tag.InputTagSupport.doEndTag(InputTagSupport.java:442)
> After some investigation it appeared that the NPE was triggered by the custom
> formatter for an object returning null (in this case because the object's id
> field was empty). Updating the formatter to return empty string instead of
> null avoided the NPE, but it would be preferable for the tag to handle this
> case gracefully.
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