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https://issues.apache.org/struts/browse/STR-3070?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Benedict resolved STR-3070.
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Resolution: Fixed
For longstanding projects with a custom subclass of the classic
RequestProcessor, it is a cheaper cost to fix the NPE and gain postback forms.
> Postback forms cause NPE with classic RequestProcessor
> ------------------------------------------------------
>
> Key: STR-3070
> URL: https://issues.apache.org/struts/browse/STR-3070
> Project: Struts 1
> Issue Type: Bug
> Components: Core
> Reporter: Paul Benedict
> Assignee: Paul Benedict
> Fix For: 1.3.10, 1.4.0
>
>
> I was unwittingly using the classic RequestProcessor when attempting to use
> postback forms. Unfortunately, I got a NPE:
> java.lang.NullPointerException
>
> org.apache.struts.taglib.TagUtils.getActionMappingName(TagUtils.java:583)
> org.apache.struts.taglib.html.FormTag.lookup(FormTag.java:834)
> org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:467)
> I traced the problem back to a missing step in the classic RP. It does not
> set the ORIGINAL_URI key like the ComposableRequestProcessor. However,
> FormTag should explain this condition when a postback form is used but the
> key is absent.
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