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jvm_library.html
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jvm_library.html
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<h1 id="define-a-scala-or-java-library-target">Define a Scala or Java Library Target</h1>
<h2 id="problem">Problem</h2>
<p>You need to define a new Scala or Java <strong>library target</strong> that other projects can use as a dependency.</p>
<p><strong>Note</strong>: If you need to define a new Scala or Java <em>binary target</em>, see <a href="jvm_binary.html">Define a JVM Executable</a></p>
<h2 id="solution">Solution</h2>
<p>Add a <code>scala_library</code> or <code>java_library</code> target to a <code>BUILD</code> file in the appropriate directory. A <code>scala_library</code> or <code>java_library</code> target will enable you to compile the library using Pants' <code>compile</code> goal. Here's an example:</p>
<div class="codehilite"><pre><span></span>$ ./pants compile src/scala/com/myorg/myproject/example:hello
</pre></div>
<h2 id="discussion">Discussion</h2>
<p>A <code>scala_library</code> or <code>java_library</code> target should specify the following:</p>
<ul>
<li>A <code>name</code> for the library. This may be something like just <code>scala</code> if you have only one <code>scala_library</code> target in a project or something more specific like <code>client-lib</code>.</li>
<li>Either the <code>source</code> field with a single file or the <code>sources</code> field with a list of file names and globs.</li>
<li>A list of <code>dependencies</code> (optional). More info on dependencies can be found in <a href="dependencies.html">Add a Dependency on Another Target</a>.</li>
</ul>
<p>Here's an example target definition:</p>
<div class="codehilite"><pre><span></span><span class="c1"># src/scala/com/myorg/myproject/example/BUILD</span>
<span class="n">scala_library</span><span class="p">(</span>
<span class="n">name</span><span class="o">=</span><span class="s1">'scala'</span><span class="p">,</span>
<span class="n">sources</span><span class="o">=</span><span class="p">[</span><span class="s1">'*.scala'</span><span class="p">],</span>
<span class="n">dependencies</span><span class="o">=</span><span class="p">[</span>
<span class="s1">'src/scala/com/myorg/myproject/client-lib'</span><span class="p">,</span>
<span class="s1">'src/scala/com/myorg/myproject/analytics-lib'</span><span class="p">,</span>
<span class="s1">'static/resources/json:config'</span><span class="p">,</span>
<span class="p">],</span>
<span class="p">)</span>
</pre></div>
<p>That library can then be compiled with:</p>
<div class="codehilite"><pre><span></span><span class="err">$</span> <span class="o">./</span><span class="n">pants</span> <span class="nb">compile</span> <span class="n">src</span><span class="o">/</span><span class="n">scala</span><span class="o">/</span><span class="n">com</span><span class="o">/</span><span class="n">myorg</span><span class="o">/</span><span class="n">myproject</span><span class="o">/</span><span class="n">example</span>
</pre></div>
<p>You can combine library targets together into a single target using a <strong>target aggregate</strong>. More info can be found in <a href="target_aggregate.html">Create a Target Aggregate</a>.</p>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="compile.html">Compile a Library Target</a></li>
<li><a href="jvm_binary.html">Define a JVM Executable</a></li>
<li><a href="bundle.html">Create a Bundled zip or Other Archive</a></li>
<li><a href="target_aggregate.html">Create a Target Aggregate</a></li>
</ul>
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