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https://issues.apache.org/jira/browse/MYFACES-251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620445#action_12620445
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Simon-Pierre Béliveau commented on MYFACES-251:
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I tried it in MyFaces 1.2.2 and I can't reproduce it. It's probably already
fixed.
> selectManyCheckbox returns conversion error if nothing is selected
> ------------------------------------------------------------------
>
> Key: MYFACES-251
> URL: https://issues.apache.org/jira/browse/MYFACES-251
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 1.0.9m9
> Environment: winXP professional SP2
> Reporter: Dorren Chen
> Assignee: sean schofield
>
> when I use <h:selectManyCheckbox> with a few checkboxes, it works correctly
> if I select at least one item from the checkboxes. However, if I don't select
> anything and submit the form, myfaces always gives "conversion error" in the
> context message <h:messages>, no exception stacktrace or log trace.
> I found another user has the same problem
> http://mail-archives.apache.org/mod_mbox/myfaces-users/200505.mbox/[EMAIL
> PROTECTED]
> I'm using myfaces version 1.0.9, build on (2005-04-13 13:17 EDT)
> after I digging around for awhile, I found out that myfaces only checks
> either null or String[] types, but in fact, an empty selection returns "", a
> zero length string. It works correct after I made changes to
> src/share/org.apache.myfaces.renderkit.RendererUtils.java's public static
> Object getConvertedUISelectManyValue() method, and add zero length string
> check between null and String[] check, as shown below:
> else if (submittedValue instanceof String &&
> ((String)submittedValue).length() == 0){
> // to fix bug that caused "conversion error" when nothing is
> selected.
> return null;
> }
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