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    <p>Rather than <code>depend</code>ing on task C, you could use the <a href="http://ant.apache.org/manual/Tasks/antcall.html" rel="nofollow">Antcall</a> task to pass the <code>B</code> argument as a <code>param</code>.</p> <pre><code>&lt;target name="A" &gt; &lt;antcall target="C" /&gt; .... &lt;/target&gt; &lt;target name="B" &gt; &lt;antcall target="C" &gt; &lt;param name="extra_arg" value="xxx" /&gt; &lt;/antcall&gt; ... &lt;/target&gt; &lt;target name="C"&gt; &lt;java fork="true" ...&gt; &lt;jvmarg .../&gt; &lt;arg .../&gt; &lt;arg .../&gt; &lt;arg value="${extra_arg}"/&gt; &lt;/java&gt; &lt;/target&gt; </code></pre> <p>EDIT: As Nico points out in the comment, this doesn't work if the value is unset from A. The answer can be extended to use the <code>condition</code> task to set the argument to a null string.</p> <pre><code>&lt;condition property="argToUseIfFromB" else=""&gt; &lt;isset property="extra_arg" /&gt; &lt;/condition&gt; &lt;java fork="true" ...&gt; &lt;jvmarg .../&gt; &lt;arg .../&gt; &lt;arg .../&gt; &lt;arg value="${argToUseIfFromB}"/&gt; &lt;/java&gt; </code></pre> <p>FURTHER EDIT: Since we can't get the arguments to be recognised as optional, we can pass in the whole command line from each parent task. Target <code>A</code> would only pass the common arguments; <code>B</code> would pass through an extra argument. The Ant manual on <a href="http://ant.apache.org/manual/using.html#arg" rel="nofollow">arguments</a> explains it better than me.</p> <pre><code>&lt;target name="A" &gt; &lt;antcall target="C"&gt; &lt;param name="java_args" value="arg_a arg_b" /&gt; &lt;/antcall&gt; .... &lt;/target&gt; &lt;target name="B" &gt; &lt;antcall target="C" &gt; &lt;param name="java_args" value="arg_a arg_b extra_arg" /&gt; &lt;/antcall&gt; ... &lt;/target&gt; &lt;target name="C"&gt; &lt;java fork="true" ...&gt; &lt;jvmarg .../&gt; &lt;arg line="${java_args}"/&gt; &lt;/java&gt; &lt;/target&gt; </code></pre>
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    1. CONope, this does not work. When A calls C it will throw an error, since no *extra_arg* has been defined at that stage. Works fine when B calls C.
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    2. CO@Nico: you're quite right. Is this edit better?
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    3. COStill no. It does the same as your original. Saying that '' is not a valid argument. Seems even if it's null it still tries to force it as an argument.
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