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http://issues.apache.org/struts/browse/WW-1577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Don Brown resolved WW-1577.
---------------------------
Resolution: Fixed
Assignee: Don Brown
What is happening here is Struts (XWork really) can't find the Result that you
had in mind. I fixed the bug where the NPE would be thrown, but you'll still
see an error for no result found. Perhaps with the conversion problem it is
looking for a result matching "input"?
> Improve handling of type conversion when loading action from URL
> ----------------------------------------------------------------
>
> Key: WW-1577
> URL: http://issues.apache.org/struts/browse/WW-1577
> Project: Struts 2
> Issue Type: Improvement
> Components: Actions
> Affects Versions: 2.0.1
> Environment: tomcat 5.5.17, windows xp
> Reporter: Dariusz Wojtas
> Assigned To: Don Brown
> Fix For: 2.0.3
>
>
> This issue came up to me several times, most recently when I tried to use
> autocompleter.
> I have a property in my action:
> private Integer carMakerId; // + get/set methods
> After submitting a form with autocompleter
> the browser creates URL
> /myApp/myAction.action?carMakerId=AUDI&carMakerIdKey=354
> Struts throws an exception:
> ----------------------
> 12:20:00,953 ERROR - Dispatcher - Could not execute action
> java.lang.NullPointerException
> at
> com.opensymphony.xwork2.DefaultActionInvocation.createResult(DefaultActionInvocation.java:197)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:337)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
> at
> com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
> at
> com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:217)
> at
> com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
> at
> com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:123)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:217)
> at
> com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
> at
> com.opensymphony.xwork2.interceptor.ParametersInterceptor.intercept(ParametersInterceptor.java:154)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:217)
> at
> com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
> at
> com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:105)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
> at
> com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:217)
> at
> com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
> at
> com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
> [...]
> There is nothing wrong with the exception. Integer cannot be loaded with
> String 'AUDI'. Clear.
> But there is ABSOLUTELY no hint in logs which property causes troubles. It
> does not even suggest that this is because of some setter problem. Just
> NullPointerException.
> And that is a real problem when form has 50+ properties and it's difficult to
> find the reason.
> In the past I had similar problems with the dropdowndatetimepicker tag when
> it automatically formatted selected date into format that was not understood
> by struts validators.
> Please make it clear in logs what causes the problem.
> Even a message of type
> Property 'propName' cannot be set with value '<put the value here>'.
> And 'NullPointerException' is not what I would expect here.
> I think it could
> a) fail as it does now - but with better messages in logs
> b) continue but with this property skipped + provide clear error/warn
> messages in logs what happened.
> Maybe this could be configurable in struts.properties.
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