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https://issues.apache.org/jira/browse/WW-5847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart resolved WW-5847.
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Resolution: Fixed
> doubleselect: preselection in the second list with doubleMultiple has never
> worked
> ----------------------------------------------------------------------------------
>
> Key: WW-5847
> URL: https://issues.apache.org/jira/browse/WW-5847
> Project: Struts 2
> Issue Type: Bug
> Components: Core Tags
> Reporter: Lukasz Lenart
> Assignee: Lukasz Lenart
> Priority: Major
> Fix For: 6.13.0, 7.5.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> {{doubleselect.ftl}} in the simple theme preselects the second list's current
> value inside the generated script. The single-value branch writes
> {{doubleNameValue}} as a quoted string literal. The branch taken when
> {{doubleMultiple}} is set writes it unquoted, as the loop bound and in the
> comparison, so a plain {{String}} becomes a bare identifier and the script
> fails on page load; a {{Collection}} renders through {{toString}} with the
> same result, and a {{String[]}} fails the template render. The branch is also
> chosen by an existence check, so {{doubleMultiple="false"}} takes it too.
> Present since WW-2809 (2.1.8). {{support/struts-6-x-x}} carries the identical
> template. The xhtml theme includes the simple template; the html5 theme
> renders a placeholder for this tag and is unaffected.
> h2. Proposed change
> * Normalise {{doubleNameValue}} in {{DoubleListUIBean}} to a list (from a
> {{String}}, a {{Collection}} or an array) and emit it in the script as an
> array of quoted, JS-escaped string literals, as the single-value branch
> already does for one value.
> * Select the branch on the boolean value of {{doubleMultiple}}, not on its
> presence.
> h2. Compatibility
> Preselecting several values in the second list works. The single-value path
> renders as before.
> h2. Tests
> * A {{String}}, a {{Collection}} and a {{String[]}} under
> {{doubleMultiple="true"}} each render a quoted list and preselect the
> matching options.
> * {{doubleMultiple="false"}} renders the single-value path.
> * The existing DoubleSelect fixtures keep passing.
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