[jira] [Created] (WW-4182) NullpointerException in DefaultUrlHelper

["Thomas Goettlich (JIRA)" <ji...@apache.org>]

Thomas Goettlich created WW-4182:
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             Summary: 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


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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