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https://issues.apache.org/jira/browse/WW-4182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798881#comment-13798881
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ASF subversion and git services commented on WW-4182:
-----------------------------------------------------
Commit 1533346 from [~lukaszlenart] in branch 'struts2/trunk'
[ https://svn.apache.org/r1533346 ]
WW-4182 Adds additional check to avoid NPE
> NullPointerException in DefaultUrlHelper
> ----------------------------------------
>
> Key: WW-4182
> URL: https://issues.apache.org/jira/browse/WW-4182
> Project: Struts 2
> Issue Type: Bug
> Components: Core Actions
> Affects Versions: 2.3.15.1
> Reporter: Thomas Goettlich
> Assignee: Lukasz Lenart
> Fix For: 2.3.16
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> In the method ??DefaultUrlHelper.buildParametersString(...)?? a
> NullPointerException occurs whenever an array or iterable parameter
> containing null elements is passed.
> The problem seems to be lines 214 and 244, which look the same:
> {code}
> link.append(buildParameterSubstring(name, paramValue.toString()));
> {code}
> For null parameters an empty string is written to the url:
> {code}
> value != null ? value.toString() : StringUtils.EMPTY
> {code}
> A fix would be to check ??paramValue?? for null as well, thus allowing arrays
> or iterables to contain null elements.
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