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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>Fail Task</title>
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</head>
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<body>
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<h2 id="fail">Fail</h2>
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<h3>Description</h3>
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<p>Exits the current build (just throwing a BuildException), optionally printing additional
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information.</p>
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<p>The message of the Exception can be set via the message attribute or character data nested into
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the element.</p>
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<h3>Parameters</h3>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>message</td>
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<td>A message giving further information on why the build exited</td>
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<td>No</td>
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</tr>
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<tr>
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<td>if</td>
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<td>Only fail <a href="../properties.html#if+unless">if a property of the given name exists</a>
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in the current project</td>
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<td>No</td>
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</tr>
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<tr>
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<td>unless</td>
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<td>Only fail <a href="../properties.html#if+unless">if a property of the given name doesn't
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exist</a> in the current project</td>
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<td>No</td>
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</tr>
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<tr>
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<td>status</td>
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<td>Exit using the specified status code; assuming the generated Exception is not caught, the
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JVM will exit with this status. <em>Since Apache Ant 1.6.2</em></td>
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<td>No</td>
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</tr>
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</table>
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<h3>Parameters specified as nested elements</h3>
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<p>As an alternative to the <var>if</var>/<var>unless</var> attributes, conditional failure can be
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achieved using a single nested <code><condition></code> element, which should contain exactly
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one core or custom condition. For information about conditions,
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see <a href="conditions.html">here</a>.<br/><em>Since Ant 1.6.2</em>
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</p>
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<h3>Examples</h3>
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<p>Exit the current build with no further information given.</p>
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<pre><fail/></pre>
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<pre class="output">
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BUILD FAILED
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build.xml:4: No message</pre>
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<p>Exit the current build and print a message to wherever your output goes:</p>
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<pre><fail message="Something wrong here."/></pre>
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<pre class="output">
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BUILD FAILED
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build.xml:4: Something wrong here.</pre>
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<p>A different way to achieve the same result as above.</p>
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<pre><fail>Something wrong here.</fail></pre>
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<p>Exit the current build and print an explanation to wherever your output goes:</p>
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<pre><fail unless="thisdoesnotexist"/></pre>
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<pre class="output">
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BUILD FAILED
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build.xml:2: unless=thisdoesnotexist</pre>
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<p>Use a condition to achieve the same effect:</p>
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<pre>
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<fail>
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<condition>
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<not>
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<isset property="thisdoesnotexist"/>
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</not>
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</condition>
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</fail></pre>
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<pre class="output">
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BUILD FAILED
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build.xml:2: condition satisfied</pre>
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<p>Check that both files <samp>one.txt</samp> and <samp>two.txt</samp> are present otherwise the
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build will fail.</p>
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<pre>
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<fail message="Files are missing.">
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<condition>
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<not>
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<resourcecount count="2">
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<fileset id="fs" dir="." includes="one.txt,two.txt"/>
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</resourcecount>
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</not>
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</condition>
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</fail></pre>
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</body>
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</html>
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