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https://issues.apache.org/jira/browse/MYFACES-3525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040977#comment-16040977
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Bill Lucy commented on MYFACES-3525:
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I realize that this issue is 5+ years old, but it's still causing problems for
users. This wasn't resolved in the 2.1 or 2.2 specifications, so aside from
workarounds there is still no solution.
The patch provided in https://issues.apache.org/jira/browse/MYFACES-2497 seems
to resolve the issue. Since this is an issue with the spec, we could fix this
issue, leave the fix disabled by default, and allow users who need this fix to
enable the non-spec fix via a configuration parameter. For example,
org.apache.myfaces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL_CLEAR_INPUT
with a default value of "false".
Would anyone have an issue with that?
> javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL value affects
> display behavior for required fields
> --------------------------------------------------------------------------------------------------------------
>
> Key: MYFACES-3525
> URL: https://issues.apache.org/jira/browse/MYFACES-3525
> Project: MyFaces Core
> Issue Type: Bug
> Affects Versions: 2.0.12
> Reporter: VS
>
> Inconsistent behavior for required field validation when
> javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL is set to true
> versus false
> To observe behavior:
> 1. Set javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL to true in
> web.xml
> 2. Create JSF Page:
> <h:form>
> <h:messages showSummary="true"/>
> <h:inputText value="#{page1Controller.firstName}"
> required="true"
> requiredMessage="You must enter a first name"/>
> <h:commandButton value="Submit"/>
> </h:form>
> 3. Create Managed Bean:
> @ManagedBean
> public class Page1Controller
> {
> public String getFirstName()
> { return "Default Value"; }
> public void setFirstName(String value)
> { // no-op (for example purposes only) }
> 4. Load JSF page, blank out value in the input field and click Submit
> 5. Error message is displayed, however the value in the input field (which
> you formerly blanked out) is now reset back to its original value.
> 6. Change the javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL
> setting to false and re-run the test.
> 7. Note that the value in the input field remains blank.
> Behavior is inconsistent and should be fixed
> (javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL setting of true
> or false should not result in inconsistent behavior with required fields)
> ----
> To state in a different way:
> When INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL is TRUE, and you blank
> out a value for a required field that had previously been populated by the
> model, submit the form, you will see the OLD data from the model in the
> field. However, if that field had had a format validation applied to it and
> the user submits the form with a format validation error, the OLD data is NOT
> shown in the field (instead, the submitted/invalid data is shown). The same
> should happen for required field validation errors. The field should show the
> "blank" data and not the original model data. In order to get the correct
> behavior, the developer has to currently set
> INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL to false. But they should not
> have to do this... whether INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL is
> true or false, the behavior of showing the blank field that the user
> submitted should be the same.
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