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    <p>You can use Ant resource tools for this.</p> <pre><code>&lt;property name="arg_list" value="foo bar hello world"/&gt; &lt;resources id="arguments"&gt; &lt;mappedresources&gt; &lt;string value="${arg_list}" /&gt; &lt;filtermapper&gt; &lt;replacestring from=" " to=" -j "/&gt; &lt;/filtermapper&gt; &lt;/mappedresources&gt; &lt;/resources&gt; &lt;property name="arguments" value="-j ${toString:arguments}" /&gt; </code></pre> <p>The above will result in property <code>arguments</code> having the value <code>-j foo -j bar -j hello -j world</code>, which can then be used in the <code>exec</code> <code>arg</code> line.</p> <p>Alternatively a <a href="http://ant.apache.org/manual/Tasks/pathconvert.html" rel="nofollow"><code>pathconvert</code> task</a> can help in this regard:</p> <pre><code>&lt;property name="arg_list" value="foo bar hello world"/&gt; &lt;pathconvert property="arguments" pathsep=" "&gt; &lt;chainedmapper&gt; &lt;flattenmapper /&gt; &lt;regexpmapper from="(.*)" to="-j \1" /&gt; &lt;/chainedmapper&gt; &lt;filelist files="${arg_list}" /&gt; &lt;/pathconvert&gt; </code></pre> <p>If you have absolute paths, rather than just strings in the list, then remove the <code>flattenmapper</code>.</p> <p>If you have relative paths, replace the <code>flattenmapper</code> line with:</p> <pre><code>&lt;globmapper from="${basedir}/*" to="*" /&gt; </code></pre> <p>to prevent the paths being converted to absolute.</p> <p>In the event that you have UNIX-like paths in the arg_list on a Windows system the default settings for pathconvert won't work - the paths get converted to Windows style. Instead, to process the list use:</p> <pre><code>&lt;pathconvert property="arguments" pathsep=" " targetos="unix"&gt; &lt;chainedmapper&gt; &lt;regexpmapper from="C:(.*)" to="-j \1" /&gt; &lt;/chainedmapper&gt; &lt;filelist files="${arg_list}" /&gt; &lt;/pathconvert&gt; </code></pre> <p>Note the <code>targetos</code> setting and the revised regexmapper from argument.</p>
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    1. POHow to transform property into multiple arguments to <exec> task
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    1. POHow to transform property into multiple arguments to <exec> task
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    1. COThis is close, but in reality my arg_list is a list of paths within an XML file. The filelist is treating these as real files, which they are not. E.g. <property name="arg_list" value="/foo/bar /hello/world /a/very/long/path"/>
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    2. CO@jfritz42 I added a string processing solution, which avoids the path processing issues arising with pathconvert.
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    3. COThe new <resources><mappedresources>... gives an error: 'resources doesn't support the nested "mappedresources" element.'
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