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<title>Fail Task</title>
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<h2><a name="fail">Fail</a></h2>
<h3>Description</h3>
<p>Exits the current build (just throwing a BuildException), optionally printing additional information.</p>
<p>The message of the Exception can be set via the message attribute
or character data nested into the element.</p>
<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">message</td>
    <td valign="top">A message giving further information on why the build exited</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">if</td>
    <td valign="top">Only fail if a property of the given name exists
      in the current project</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">unless</td>
    <td valign="top">Only fail if a property of the given name doesn't
      exist in the current project</td>
    <td align="center" valign="top">No</td>
  </tr>
</table>

<h3>Parameters specified as nested elements</h3>

<p>As an alternative to the <i>if</i>/<i>unless</i> attributes,
  conditional failure can be achieved using a single nested
  &lt;condition&gt; element, which should contain exactly one
  core or custom condition.  For information about conditions, see
  <a href="conditions.html">here</a>.<br /><b>Since Ant 1.6.2</b>
</p>

<h3>Examples</h3>
<pre>  &lt;fail/&gt;</pre>
<p>will exit the current build with no further information given.</p>
<pre>
BUILD FAILED

build.xml:4: No message
</pre>

<pre>  &lt;fail message=&quot;Something wrong here.&quot;/&gt;</pre>
<p>will exit the current build and print something
  like the following to wherever your output goes:
</p>
<pre>
BUILD FAILED

build.xml:4: Something wrong here.
</pre>

<pre>  &lt;fail&gt;Something wrong here.&lt;/fail&gt;</pre>
<p>will give the same result as above.</p>

<pre>  &lt;fail unless=&quot;thisdoesnotexist&quot;/&gt;</pre>
<p>will exit the current build and print something
  like the following to wherever your output goes:
</p>
<pre>
BUILD FAILED

build.xml:2: unless=thisdoesnotexist
</pre>

Using a condition to achieve the same effect:

<pre>
  &lt;fail&gt;
     &lt;condition&gt;
       &lt;not&gt;
         &lt;isset property=&quot;thisdoesnotexist&quot;/&gt;
       &lt;/not&gt;
     &lt;/condition&gt;
   &lt;/fail&gt;
</pre>

<p>Output:</p>
<pre>
BUILD FAILED

build.xml:2: condition satisfied
</pre>

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<p align="center">Copyright &copy; 2000-2001,2004 The Apache Software Foundation. All rights
Reserved.</p>

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