[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-3551) Seam can not convert java.util.Date, it ignores javax.faces.convert.DateTimeConverter

[Dan Allen (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBSEAM-3551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12433955#action_12433955 ] 

Dan Allen commented on JBSEAM-3551:
-----------------------------------

This is one of those issues where at first, it seems so obvious, but on further examination you realize that there is a very good reason why the DateTimeConverter is not bound directly to the Date type. There is no universal way to represent a date as a string. That is why Java includes a whole hierarchy of classes for date formatting and parsing and why there is the JodaTime project and a JSR. This is not a trivial issue. We could bind the DateTimeConverter to the Date type and register some standard pattern, like ISO, but that would be marginally useful since, again, not everyone represents dates the same. You should be specifying your date converter in your component or page parameter. Either that, or we need a more sophisticated proposal. Perhaps you can set a default pattern in your components.xml file that applies to the whole application. But then, why don't you just do that in faces-config.xml?

> Seam can not convert java.util.Date, it ignores javax.faces.convert.DateTimeConverter
> -------------------------------------------------------------------------------------
>
>                 Key: JBSEAM-3551
>                 URL: https://jira.jboss.org/jira/browse/JBSEAM-3551
>             Project: Seam
>          Issue Type: Bug
>    Affects Versions: 2.0.2.SP1
>         Environment: Jdk 1.5. Tomcat 6.0.18, Jboss Tools 2.1.2
>            Reporter: Francisco Jose Peredo Noguez
>            Assignee: Dan Allen
>         Attachments: SeamTestCase.zip
>
>
> Create a Seam project using  Jboss Tools 2.1.2.
> Create a new Seam Form with name "SeamDateForm"
> Open the file SeamDateForm.java and change the value from Integer to java.util.Date.
> Right-click seamDateForm.xhtml and click Run As... -> Run On Server.
> Write something in the form (like for example some random string "dfasdf")
> You will get the error: Conversion Error setting value 'dfasdf' for 'null Converter'. 
> Now create a Date Converter, as the one included in the attached test case project (BTW it inherits from javax.faces.convert.DateTimeConverter).
> Stop the application (just to be 100% sure everything gets loaded correctly)
> Again:
> Right-click seamDateForm.xhtml and click Run As... -> Run On Server.
> Write something in the form (like for example some random string "dfasdf")
> Now you get the right error: value must be a date, eg. 10/13/2008.
> Of course it not only fails when you write a random string, even if you write a correct date, like 01/01/2001, you will get an error that says: Conversion Error setting value '01/01/2001' for 'null Converter'. But if you write your own converter (for example inheriting from javax.faces.convert.DateTimeConverter) everything works fine.
> I think Seam should use javax.faces.convert.DateTimeConverter by default, I shouldn't need to create my own converter.

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