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<title>Listeners &amp; Loggers</title>
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<h1>Listeners &amp; Loggers</h1>

<h2><a name="Overview">Overview</a></h2>

<p>Ant has two related features to allow the build process to be monitored:
listeners and loggers.</p>

<h3><a name="Listeners">Listeners</a></h3>

<p>A listener is alerted of the following events:</p>

<ul>
  <li>build started</li>
  <li>build finished</li>
  <li>target started</li>
  <li>target finished</li>
  <li>task started</li>
  <li>task finished</li>
  <li>message logged</li>
</ul>

<h3><a name="Loggers">Loggers</a></h3>

<p>Loggers extend the capabilities of listeners and add the following features:</p>

<ul>
  <li>Receives a handle to the standard output and error print streams and
  therefore can log information to the console or the -logfile specified file.</li>
  <li>Logging level (-quiet, -verbose, -debug) aware</li>
  <li>Emacs-mode aware</li>
</ul>

<h2><a name="builtin">Built-in Listeners/Loggers</a></h2>

<table border="1" cellspacing="1" width="100%" id="AutoNumber1">
  <tr>
    <td width="33%">Classname</td>
    <td width="33%">Description</td>
    <td width="34%">Type</td>
  </tr>
  <tr>
    <td width="33%"><code><a href="#DefaultLogger">org.apache.tools.ant.DefaultLogger</a></code></td>
    <td width="33%">The logger used implicitly unless overridden with the
    <code>-logger</code> command-line switch.</td>
    <td width="34%">BuildLogger</td>
  </tr>
  <tr>
    <td width="33%"><code><a href="#NoBannerLogger">
    org.apache.tools.ant.NoBannerLogger</a></code></td>
    <td width="33%">This logger omits output of empty target output.</td>
    <td width="34%">BuildLogger</td>
  </tr>
  <tr>
    <td width="33%"><code><a href="#MailLogger">
    org.apache.tools.ant.listener.MailLogger</a></code></td>
    <td width="33%">Extends DefaultLogger such that output is still generated
    the same, and when the build is finished an e-mail can be sent.</td>
    <td width="34%">BuildLogger</td>
  </tr>
  <tr>
    <td width="33%"><code><a href="#AnsiColorLogger">
    org.apache.tools.ant.listener.AnsiColorLogger</a></code></td>
    <td width="33%">Colorifies the build output.</td>
    <td width="34%">BuildLogger</td>
  </tr>
  <tr>
    <td width="33%"><code><a href="#Log4jListener">
    org.apache.tools.ant.listener.Log4jListener</a></code></td>
    <td width="33%">Passes events to Log4j for highly customizable logging.</td>
    <td width="34%">BuildListener</td>
  </tr>
  <tr>
    <td width="33%"><code><a href="#XmlLogger">org.apache.tools.ant.XmlLogger</a></code></td>
    <td width="33%">Writes the build information to an XML file.</td>
    <td width="34%">BuildLogger</td>
  </tr>
</table>
<h3><a name="DefaultLogger">DefaultLogger</a></h3>

<p>Simply run Ant normally, or:</p>

<blockquote>

<p><code>ant -logger org.apache.tools.ant.DefaultLogger</code></p>

</blockquote>

<h3><a name="NoBannerLogger">NoBannerLogger</a></h3>

<p>Removes output of empty target output.</p>

<blockquote>

<p><code>ant -logger org.apache.tools.ant.NoBannerLogger</code></p>

</blockquote>

<h3><a name="MailLogger">MailLogger</a></h3>

<p>The MailLogger captures all output logged through DefaultLogger (standard Ant
output) and will send success and failure messages to unique e-mail lists, with
control for turning off success or failure messages individually.</p>
<p>Properties controlling the operation of MailLogger:</p>
<table border="1" cellspacing="1" width="100%" id="AutoNumber2">
  <tr>
    <th width="337">Property</th>
    <th width="63%">Description</th>
    <th width="63%">Required</th>
  </tr>
  <tr>
    <td width="337">MailLogger.mailhost </td>
    <td width="63%">Mail server to use</td>
    <td width="63%">No, default &quot;localhost&quot;</td>
  </tr>
  <tr>
    <td width="337">MailLogger.from</td>
    <td width="63%">Mail &quot;from&quot; address</td>
    <td width="63%">Yes, if mail needs to be sent</td>
  </tr>
  <tr>
    <td width="337">MailLogger.failure.notify </td>
    <td width="63%">Send build failure e-mails?</td>
    <td width="63%">No, default &quot;true&quot;</td>
  </tr>
  <tr>
    <td width="337">MailLogger.success.notify </td>
    <td width="63%">Send build success e-mails?</td>
    <td width="63%">No, default &quot;true&quot;</td>
  </tr>
  <tr>
    <td width="337">MailLogger.failure.to </td>
    <td width="63%">Address(es) to send failure messages to, comma-separated</td>
    <td width="63%">Yes, if failure mail is to be sent</td>
  </tr>
  <tr>
    <td width="337">MailLogger.success.to </td>
    <td width="63%">Address(es) to send success messages to, comma-separated</td>
    <td width="63%">Yes, if success mail is to be sent</td>
  </tr>
  <tr>
    <td width="337">MailLogger.failure.subject </td>
    <td width="63%">Subject of failed build</td>
    <td width="63%">No, default &quot;Build Failure&quot;</td>
  </tr>
  <tr>
    <td width="337">MailLogger.success.subject </td>
    <td width="63%">Subject of successful build</td>
    <td width="63%">No, default &quot;Build Success&quot;</td>
  </tr>
  <tr>
    <td width="337">MailLogger.properties.file </td>
    <td width="63%">Filename of properties file that will override other values.</td>
    <td width="63%">No</td>
  </tr>
</table>
<blockquote>

<p><code>ant -logger org.apache.tools.ant.listener.MailLogger</code></p>

</blockquote>

<h3><a name="AnsiColorLogger">AnsiColorLogger</a></h3>

<p>The AnsiColorLogger adds color to the standard Ant output
by prefixing and suffixing ANSI color code escape sequences to
it.  It is just an extension of <a href="#DefaultLogger">DefaultLogger</a>
and hence provides all features that DefaultLogger does.</p>
<p>AnsiColorLogger differentiates the output by assigning
different colors depending upon the type of the message.</p>
<p>If used with the -logfile option, the output file
will contain all the necessary escape codes to
display the text in colorized mode when displayed
in the console using applications like cat, more, etc.</p>
<p>This is designed to work on terminals that support ANSI
color codes.  It works on XTerm, ETerm, Win9x Console
(with ANSI.SYS loaded.), etc.</p>
<p><Strong>NOTE:</Strong>
It doesn't work on WinNT even when a COMMAND.COM console loaded with
ANSI.SYS is used.</p>
<p>If the user wishes to override the default colors
with custom ones, a file containing zero or more of the
custom color key-value pairs must be created.  The recognized keys
and their default values are shown below:</p><code><pre>
AnsiColorLogger.ERROR_COLOR=2;31
AnsiColorLogger.WARNING_COLOR=2;35
AnsiColorLogger.INFO_COLOR=2;36
AnsiColorLogger.VERBOSE_COLOR=2;32
AnsiColorLogger.DEBUG_COLOR=2;34</pre></code>
<p>Each key takes as value a color combination defined as
<b>Attribute;Foreground;Background</b>.  In the above example, background
value has not been used.</p>
<p>This file must be specfied as the value of a system variable
named ant.logger.defaults and passed as an argument using the -D
option to the <b>java</b> command that invokes the Ant application.
An easy way to achieve this is to add -Dant.logger.defaults=
<i>/path/to/your/file</i> to the ANT_OPTS environment variable.
Ant's launching script recognizes this flag and will pass it to
the java command appropriately.</p>
<p>Format:</p><pre>
AnsiColorLogger.*=Attribute;Foreground;Background

Attribute is one of the following:
0 -> Reset All Attributes (return to normal mode)
1 -> Bright (Usually turns on BOLD)
2 -> Dim
3 -> Underline
5 -> link
7 -> Reverse
8 -> Hidden

Foreground is one of the following:
30 -> Black
31 -> Red
32 -> Green
33 -> Yellow
34 -> Blue
35 -> Magenta
36 -> Cyan
37 -> White

Background is one of the following:
40 -> Black
41 -> Red
42 -> Green
43 -> Yellow
44 -> Blue
45 -> Magenta
46 -> Cyan
47 -> White</pre>

<blockquote>

<p><code>ant -logger org.apache.tools.ant.listener.AnsiColorLogger</code></p>

</blockquote>

<h3><a name="Log4jListener">Log4jListener</a></h3>

<p>Passes build events to Log4j, using the full classname's of the generator of
each build event as the category:</p>

<ul>
  <li>build started / build finished - org.apache.tools.ant.Project</li>
  <li>target started / target finished - org.apache.tools.ant.Target</li>
  <li>task started / task finished - the fully qualified classname of the task</li>
  <li>message logged - the classname of one of the above, so if a task logs a
  message, its classname is the category used, and so on.</li>
</ul>

<p>All start events are logged as INFO.&nbsp; Finish events are either logged as
INFO or ERROR depending on whether the build failed during that stage. Message
events are logged according to their Ant logging level, mapping directly to a
corresponding Log4j level.</p>

<blockquote>

<p><code>ant -listener org.apache.tools.ant.listener.Log4jListener</code></p>

</blockquote>

<h3><a name="XmlLogger">XmlLogger</a></h3>

<p>Writes all build information out to an XML file named log.xml, or the value
of the <code>XmlLogger.file</code> property if present, when used as a
listener. When used as a logger, it writes all output to either the
console or to the value of <code>-logfile</code>. Whether used as a listener
or logger, the output is not generated until the build is complete, as it
buffers the information in order to provide timing information for task,
targets, and the project.
<p>
By default the XML file creates 
a reference to an XSLT file "log.xsl" in the current directory; look in 
ANT_HOME/etc for one of these. You can set the property 
<code>ant.XmlLogger.stylesheet.uri</code> to provide a uri to a style sheet.
this can be a relative or absolute file path, or an http URL. 
If you set the property to the empty string, "", no XSLT transform
is declared at all. 

 
</p>

<blockquote>

<p><code>ant -listener org.apache.tools.ant.XmlLogger</code><br/>
<code>ant -logger org.apache.tools.ant.XmlLogger -verbose -logfile build_log.xml</code></p>

</blockquote>

<h2><a name="dev">Writing your own</a></h2>

<p>See the <a href="develop.html#buildevents">Build Events</a> section for
developers.</p>

<p>Notes:</p>

<ul>
  <li>A listener or logger should not write to standard output or error - Ant
  captures these internally and may cause an infinite loop.</li>
</ul>

<hr>
<p align="center">Copyright &copy; 2000-2002 Apache Software Foundation. All rights
Reserved.</p>

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