youys
/
ant

<!DOCTYPE html>
<!--
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       https://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
-->
<html lang="en">

<head>
<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Fail Task</title>
</head>

<body>

<h2 id="fail">Fail</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 class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>message</td>
    <td>A message giving further information on why the build exited</td>
    <td>No</td>
  </tr>
  <tr>
    <td>if</td>
    <td>Only fail <a href="../properties.html#if+unless">if a property of the given name exists</a>
      in the current project</td>
    <td>No</td>
  </tr>
  <tr>
    <td>unless</td>
    <td>Only fail <a href="../properties.html#if+unless">if a property of the given name doesn't
      exist</a> in the current project</td>
    <td>No</td>
  </tr>
  <tr>
    <td>status</td>
    <td>Exit using the specified status code; assuming the generated Exception is not caught, the
      JVM will exit with this status. <em>Since Apache Ant 1.6.2</em></td>
    <td>No</td>
  </tr>
</table>

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

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

<h3>Examples</h3>

<p>Exit the current build with no further information given.</p>
<pre>&lt;fail/&gt;</pre>

<pre class="output">
BUILD FAILED

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

<p>Exit the current build and print a message to wherever your output goes:</p>
<pre>&lt;fail message=&quot;Something wrong here.&quot;/&gt;</pre>

<pre class="output">
BUILD FAILED

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

<p>A different way to achieve the same result as above.</p>
<pre>&lt;fail&gt;Something wrong here.&lt;/fail&gt;</pre>

<p>Exit the current build and print an explanation to wherever your output goes:</p>
<pre>&lt;fail unless=&quot;thisdoesnotexist&quot;/&gt;</pre>

<pre class="output">
BUILD FAILED

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

<p>Use a condition to achieve the same effect:</p>
<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>

<pre class="output">
BUILD FAILED

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

<p>Check that both files <samp>one.txt</samp> and <samp>two.txt</samp> are present otherwise the
build will fail.</p>
<pre>
&lt;fail message=&quot;Files are missing.&quot;&gt;
    &lt;condition&gt;
        &lt;not&gt;
            &lt;resourcecount count=&quot;2&quot;&gt;
                &lt;fileset id=&quot;fs&quot; dir=&quot;.&quot; includes=&quot;one.txt,two.txt&quot;/&gt;
            &lt;/resourcecount&gt;
        &lt;/not&gt;
    &lt;/condition&gt;
&lt;/fail&gt;</pre>

</body>
</html>