[ http://mc4j.org/jira/browse/STS-426?page=all ]
Alan Burlison updated STS-426:
------------------------------
Attachment: PropertyExpressionEvaluation.java.patch.v1
Proff of concept patch - needs work!
> NPE in PropertyExpressionEvaluation.getScalarType with generics
> ---------------------------------------------------------------
>
> Key: STS-426
> URL: http://mc4j.org/jira/browse/STS-426
> Project: Stripes
> Issue Type: Bug
> Components: Validation
> Affects Versions: Release 1.4.3
> Environment: OpemSolaris / Tomcat 5.5.17
> Reporter: Alan Burlison
> Assigned To: Tim Fennell
> Attachments: PropertyExpressionEvaluation.java.patch.v1
>
>
> I have a generic class that is used to store result set scrolling information
> for query pages. Specifically, the class holds the maximum
> and minimum key values for the rows displayed on the page:
> public class ResultPageState<K> {
> // Methods elided
> private K minKey;
> private K maxKey;
> private boolean moreBefore;
> private boolean moreAfter;
> }
> I store an appropriately-typed instance of this class inside my ActionBeans,
> e.g. if the keys are Strings:
> private ResultPageState<String> pageState;
> In the associated JSP I refer to the pageState as follows:
> <ss:hidden name="pageState.minKey"/>
> <ss:hidden name="pageState.maxKey"/>
> <ss:hidden name="pageState.moreBefore"/>
> <ss:hidden name="pageState.moreAfter"/>
> When rendering the page the values are retrieved correctly:
> <input name="pageState.minKey" value="quinn" type="hidden" />
> <input name="pageState.maxKey" value="zach" type="hidden" />
> <input name="pageState.moreBefore" value="true" type="hidden" />
> <input name="pageState.moreAfter" value="false" type="hidden" />
> But during the binding phase of Action submit processing a NPE is thrown:
> 23 Oct 2007 12:54:59,956 DEBUG Could not bind property with name
> [pageState.maxKey] to bean of type: UserSearchAction
> java.lang.NullPointerException
> at
> net.sourceforge.stripes.util.bean.PropertyExpressionEvaluation.getScalarType(PropertyExpressionEvaluation.java:479)
> at
> net.sourceforge.stripes.controller.DefaultActionBeanPropertyBinder.bind(DefaultActionBeanPropertyBinder.java:265)
> at
> net.sourceforge.stripes.controller.DispatcherHelper$3.intercept(DispatcherHelper.java:185)
> at
> net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:157)
> at
> net.sourceforge.stripes.controller.BeforeAfterMethodInterceptor.intercept(BeforeAfterMethodInterceptor.java:107)
> at
> net.sourceforge.stripes.controller.ExecutionContext.proceed(ExecutionContext.java:154)
> at
> net.sourceforge.stripes.controller.ExecutionContext.wrap(ExecutionContext.java:73)
> at
> net.sourceforge.stripes.controller.DispatcherHelper.doBindingAndValidation(DispatcherHelper.java:182)
> at
> net.sourceforge.stripes.controller.DispatcherServlet.doBindingAndValidation(DispatcherServlet.java:217)
> at
> net.sourceforge.stripes.controller.DispatcherServlet.doPost(DispatcherServlet.java:142)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
> The offending code seems to be in
> net.sourceforge.stripes.util.beanPropertyExpressionEvaluation.convertToClass
> - if it fails to resolve the type to a Class it returns null, and that
> results in the NPE in PropertyExpressionEvaluation.getScalarType. The
> comments on convertToClass seem to suggest that it should cope with generics,
> but in this case it obviously doesn't.
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