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javac_plugins.html
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<!DOCTYPE html>
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Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
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<li class="toc-h1"><a href="#building-javac-plugins">Building javac plugins</a></li>
<li class="toc-h1"><a href="#using-javac-plugins">Using javac plugins</a></li>
<li class="toc-h2"><a href="#global-plugins">Global plugins</a></li>
<li class="toc-h2"><a href="#per-target-plugins">Per-target plugins</a></li>
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<h1 id="javac-plugins-with-pants">javac Plugins with Pants</h1>
<p>For Java versions 8 and higher, the Java compiler, javac, has a
<a href="https://docs.oracle.com/javase/8/docs/jdk/api/javac/tree/com/sun/source/util/Plugin.html">plugin</a> mechanism.</p>
<p>Plugins allow you to hook into the compiler while it's running, to perform various
tasks such as custom error checking, code analysis and so on.</p>
<p>Pants supports both building and using javac plugins.</p>
<h2 id="building-javac-plugins">Building javac plugins</h2>
<p>javac plugins are specified using a <code>javac_plugin</code> target:</p>
<div class="codehilite"><pre>javac_plugin(
name = 'plugin',
plugin = 'simple_javac_plugin',
sources = ['SimpleJavacPlugin.java'],
dependencies = [],
classname = 'org.pantsbuild.example.javac.plugin.SimpleJavacPlugin',
scope='compile',
)
</pre></div>
<p>A javac plugin target has the same fields as a <code>java_library</code> target,
plus two extra:</p>
<ul>
<li><code>classname</code>: The name of the <code>Plugin</code> implementation class. Required.</li>
<li><code>plugin</code>: The logical name of the plugin, as returned by the <code>Plugin</code>
class's <code>getName()</code> method. If unspecified, this field defaults to
the target name.</li>
</ul>
<p>Building a plugin target will, in addition to compiling the code, generate
the appropriate metadata into <code>META-INF/services/com.sun.source.util.Plugin</code>, so
that javac can load the plugin by name at runtime.</p>
<p>A plugin may be published for later consumption in any repo. It can also
be consumed (with some restrictions) from source, in the same repo.</p>
<h2 id="using-javac-plugins">Using javac plugins</h2>
<p>Plugins can be integrated in one of two ways:</p>
<ul>
<li>Global plugins: specified in <code>pants.ini</code> and used on all Java code.</li>
<li>Per-target plugins: specified on a Java target and used only when compiling that target.</li>
</ul>
<h4 id="global-plugins">Global plugins</h4>
<p>Global plugins are specified using the <code>javac_plugins</code> key in the <code>compile.zinc</code> section of <code>pants.ini</code>:</p>
<div class="codehilite"><pre>[compile.zinc]
javac_plugins: ['simple_javac_plugin']
</pre></div>
<p>Plugins can optionally take arguments, specified like this:</p>
<div class="codehilite"><pre>[compile.zinc]
javac_plugins: ['simple_javac_plugin]
javac_plugin_args: {
'simple_javac_plugin': ['arg1', 'arg2']
}
</pre></div>
<h4 id="per-target-plugins">Per-target plugins</h4>
<p>These are specified like this:</p>
<div class="codehilite"><pre>java_library(
...
javac_plugins=['simple_javac_plugin'],
javac_plugin_args={
'simple_javac_plugin': ['arg1', 'arg2']
}
)
</pre></div>
<h4 id="depending-on-plugins">Depending on plugins</h4>
<p>In order to load a plugin, it has to be on javac's classpath.
This can be achieved in one of two ways:</p>
<ul>
<li>Have targets that must be compiled with a plugin depend (directly or indirectly)
either on the <code>javac_plugin</code> target, or on a <code>jar_library</code> pointing to a published version
of the plugin.</li>
<li>Have a <code>javac-plugin-dep</code> target in <code>BUILD.tools</code>:</li>
</ul>
<div class="codehilite"><pre>jar_library(name='java-plugin-dep',
jars = [jar(org='com.foo', name='foo_plugin', rev='1.2.3')],
</pre></div>
<p>Note that, as always with <code>BUILD.tools</code>, plugin locations specified via <code>java-plugin-dep</code>
must be published jars. They cannot be local <code>javac_plugin</code> targets.</p>
<p>Usually, it will make more sense to use <code>java-plugin-dep</code> with global plugins, to avoid
laborious repetition of that dependency, and to use target dependencies for per-target plugins,
to keep the dependencies selective.<br/>
</p>
<p>Depending directly on the <code>javac_plugin</code> has the added advantage of allowing plugin changes
to be picked up when compiling the target that uses the plugin, with no need for an intermediate
publishing step.</p>
<p>Note that, to avoid a chicken-and-egg problem, an in-repo plugin will not be used when
compiling its own <code>javac_plugin</code> target, or any of that target's dependencies.
To use a plugin on its own code, you must publish it and consume the published plugin
via <code>java-plugin-dep</code>.</p>
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