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<h2><a name="javac">Javac</a></h2>
<h3>Description</h3>
<p>Compiles a source tree within the running (Ant) VM.</p>
<p>The source and destination directory will be recursively scanned for Java
source files to compile. Only Java files that have no corresponding class file
or where the class file is older than the java file will be compiled.</p>
<p>Note: Ant uses only the names of the source and class files to find
the classes that need a rebuild. It will not scan the source and therefor
will have no knowledge about nested classes, classes that are named different
from the source file and so on.</p>
<p>The directory structure of the source tree should follow the package
hierarchy.</p>
<p>It is possible to refine the set of files that are being compiled/copied.
This can be done with the <i>includes</i>, <i>includesfile</i>, <i>excludes</i>, <i>excludesfile</i> and <i>defaultexcludes</i>
attributes. With the <i>includes</i> or <i>includesfile</i> attribute you specify the files you want to
have included by using patterns. The <i>exclude</i> or <i>excludesfile</i> attribute is used to specify
the files you want to have excluded. This is also done with patterns. And
finally with the <i>defaultexcludes</i> attribute, you can specify whether you
want to use default exclusions or not. See the section on <a
href="../dirtasks.html#directorybasedtasks">directory based tasks</a>, on how the
inclusion/exclusion of files works, and how to write patterns.</p>
<p>It is possible to use different compilers. This can be selected with the
&quot;build.compiler&quot; property. There are four choices:</p>
<ul>
  <li>classic (the standard compiler of JDK 1.1/1.2)</li>
  <li>modern (the new compiler of JDK 1.3)</li>
  <li>jikes (the <a
    href="http://oss.software.ibm.com/developerworks/opensource/jikes/project" target="_top">Jikes</a>
    compiler)</li>
  <li>jvc (the Command-Line Compiler from Microsoft's SDK for Java /
    Visual J++) - microsoft can be used as an alias</li>
  <li>kjc (the <a href="http://www.dms.at/kopi/" target="_top">kopi</a>
    compiler)</li>
  <li>gcj (the gcj compiler from gcc)</li>
  <li>sj (Symantec java compiler) - symantec can be used as an alias</li>
  <li>extJavac (run either modern or classic in a JVM of its own)</li>
</ul>
<p>For JDK 1.1/1.2, classic is the default. For JDK 1.3/1.4, modern is the default.
If you wish to use a different compiler interface than one of the four
supplied, write a class that implements the CompilerAdapter interface
(package org.apache.tools.ant.taskdefs.compilers). Supply the full
classname in the &quot;build.compiler&quot; property.
</p>
<p>The fork attribute overrides the build.compiler setting and expects
a JDK1.1 or higher to be set in java.home.
</p>
<p>This task will drop all entries that point to non-existant
files/directories from the CLASSPATH it passes to the compiler.</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">srcdir</td>
    <td valign="top">location of the java files. (See Notes at the end)</td>
    <td align="center" valign="top">Yes, unless nested <code>&lt;src&gt;</code> elements are present.</td>
  </tr>
  <tr>
    <td valign="top">destdir</td>
    <td valign="top">location to store the class files.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">includes</td>
    <td valign="top">comma-separated list of patterns of files that must be
      included; all files are included when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">includesfile</td>
    <td valign="top">the name of a file that contains
      include patterns.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">excludes</td>
    <td valign="top">comma-separated list of patterns of files that must be
      excluded; no files (except default excludes) are excluded when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">excludesfile</td>
    <td valign="top">the name of a file that contains
      exclude patterns.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">defaultexcludes</td>
    <td valign="top">indicates whether default excludes should be used
      (<code>yes</code> | <code>no</code>); default excludes are used when omitted.</td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">classpath</td>
    <td valign="top">the classpath to use.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">bootclasspath</td>
    <td valign="top">location of bootstrap class files.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">classpathref</td>
    <td valign="top">the classpath to use, given as a
      <a href="../using.html#references">reference</a> to a PATH defined elsewhere.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">bootclasspathref</td>
    <td valign="top">location of bootstrap class files, given as a
      <a href="../using.html#references">reference</a> to a PATH defined elsewhere.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">extdirs</td>
    <td valign="top">location of installed extensions.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">encoding</td>
    <td valign="top">encoding of source files. (gcj doesn't support
      this option yet)</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">debug</td>
    <td valign="top">indicates whether source should be compiled with debug
      information; defaults to <code>off</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">optimize</td>
    <td valign="top">indicates whether source should be compiled with
      optimization; defaults to <code>off</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">deprecation</td>
    <td valign="top">indicates whether source should be compiled with
      deprecation information; defaults to <code>off</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">target</td>
    <td valign="top">generate class files for specific VM version (e.g.,
	 <code>1.1</code> or <code>1.2</code>).</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">verbose</td>
    <td valign="top">asks the compiler for verbose output.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">depend</td> <td valign="top">enables dependency-tracking
      for compilers that support this (jikes and classic)</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">includeAntRuntime</td> 
    <td valign="top">whether to include the Ant run-time libraries;
      defaults to <code>yes</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">includeJavaRuntime</td> 
    <td valign="top">whether to include the default run-time
      libraries from the executing VM; defaults to <code>no</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>
  <tr>
    <td valign="top">fork</td> 
    <td valign="top">whether to execute Javac using the JDK compiler externally;
    defaults to <code>no</code>.</td>
    <td align="center" valign="top">No</td>
  </tr>  
  <tr>
    <td valign="top">failonerror</td> <td valign="top">
        indicates whether the build will continue even if there are compilation errors; defaults to <code>true</code>.
    </td>
    <td align="center" valign="top">No</td>
  </tr>
</table>

<h3>Parameters specified as nested elements</h3>
<p>This task forms an implicit <a href="../CoreTypes/fileset.html">FileSet</a> and
supports all attributes of <code>&lt;fileset&gt;</code>
(<code>dir</code> becomes <code>srcdir</code>) as well as the nested
<code>&lt;include&gt;</code>, <code>&lt;exclude&gt;</code> and
<code>&lt;patternset&gt;</code> elements.</p>
<h4><code>src</code>, <code>classpath</code>, <code>bootclasspath</code> and <code>extdirs</code></h4>
<p><code>Javac</code>'s <i>srcdir</i>, <i>classpath</i>,
<i>bootclasspath</i> and <i>extdirs</i> attributes are <a
href="../using.html#path">path-like structures</a> and can also be set via nested
<code>&lt;src&gt</code>,
<code>&lt;classpath&gt</code>,
<code>&lt;bootclasspath&gt</code> and
<code>&lt;extdirs&gt</code> elements, respectively.</p>

<h3>Examples</h3>
<pre>  &lt;javac srcdir=&quot;${src}&quot;
         destdir=&quot;${build}&quot;
         classpath=&quot;xyz.jar&quot;
         debug=&quot;on&quot;
  /&gt;</pre>
<p>compiles all <code>.java</code> files under the <code>${src}</code>
directory, and stores
the <code>.class</code> files in the <code>${build}</code> directory.
The classpath used contains <code>xyz.jar</code>, and debug information is on.</p>
<pre>  &lt;javac srcdir=&quot;${src}&quot;
         destdir=&quot;${build}&quot;
         includes=&quot;mypackage/p1/**,mypackage/p2/**&quot;
         excludes=&quot;mypackage/p1/testpackage/**&quot;
         classpath=&quot;xyz.jar&quot;
         debug=&quot;on&quot;
  /&gt;</pre>
<p>compiles <code>.java</code> files under the <code>${src}</code>
directory, and stores the
<code>.class</code> files in the <code>${build}</code> directory.
The classpath used contains <code>xyz.jar</code>, and debug information is on.
Only files under <code>mypackage/p1</code> and <code>mypackage/p2</code> are
used. Files in the <code>mypackage/p1/testpackage</code> directory are excluded
from compilation.</p>

<pre>  &lt;javac srcdir=&quot;${src}:${src2}&quot;
         destdir=&quot;${build}&quot;
         includes=&quot;mypackage/p1/**,mypackage/p2/**&quot;
         excludes=&quot;mypackage/p1/testpackage/**&quot;
         classpath=&quot;xyz.jar&quot;
         debug=&quot;on&quot;
  /&gt;</pre>

<p>is the same as the previous example, with the addition of a second
source path, defined by
the property <code>src2</code>. This can also be represented using nested
<code>&lt;src&gt;</code> elements as follows:</p>

<pre>  &lt;javac destdir=&quot;${build}&quot;
         classpath=&quot;xyz.jar&quot;
         debug=&quot;on&quot;&gt;
    &lt;src path=&quot;${src}&quot;/&gt;
    &lt;src path=&quot;${src2}&quot;/&gt;
    &lt;include name=&quot;mypackage/p1/**&quot;/&gt;
    &lt;include name=&quot;mypackage/p2/**&quot;/&gt;
    &lt;exclude name=&quot;mypackage/p1/testpackage/**&quot;/&gt;
  &lt;/javac&gt;</pre>

<p><b>Note:</b> If you are using Ant on Windows and a new DOS window pops up
for every use of an external compiler, this may be a problem of the JDK you are using.
This problem may occur with all JDKs &lt; 1.2.</p>

<p><b>Note:</b> If you wish to compile only source-files located in some packages below a
common root you should not include these packages in the srcdir-attribute. Use include/exclude-attributes
or elements to filter for these packages. If you include part of your package-structure inside the srcdir-attribute 
(or nested src-elements) Ant will start to recompile your sources everytime you call it.</p>

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

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