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jvm_options.html
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<h1 id="specify-jvm-options">Specify JVM Options</h1>
<h2 id="problem">Problem</h2>
<p>You need to specify command-line options for the JVM when running a Scala or Java goal, e.g. to set GC options, memory limits, enable debugging, etc.</p>
<p>Examples of JVM options can be found <a href="https://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/jrdocs/refman/optionX.html">here</a>.</p>
<h2 id="solution">Solution</h2>
<p>Use the <code>--jvm-run-jvm-options</code> flag to pass the options. Here's an example:</p>
<div class="codehilite"><pre><span class="nv">$ </span>./pants run my-jvm-project:bin --jvm-run-jvm-options<span class="o">=</span><span class="s1">'-XX:+UseParallelGC,-Xdebug,-Xprof'</span>
</pre></div>
<p>As you can see in the example above, you can pass in multiple options separated by a comma. Multiple options can also be separated by line (just make sure not to use commas):</p>
<div class="codehilite"><pre><span class="nv">$ </span>./pants run my-jvm-project:bin --jvm-run-jvm-options<span class="o">=</span><span class="s2">"</span>
<span class="s2"> -XX:+UseParallelGC</span>
<span class="s2"> -Xdebug</span>
<span class="s2"> -Xprof</span>
<span class="s2"> "</span>
</pre></div>
<h2 id="discussion">Discussion</h2>
<p>The pants argument <code>--jvm-run-jvm-options</code> is <em>only</em> used for arguments passed to the JVM itself, not to the executable target. If you need to pass command-line arguments to the executable target, see <a href="cli_args.html">Pass Command-line Arguments to an Executable</a>.</p>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="cli_args.html">Pass Command-line Arguments to an Executable</a></li>
<li><a href="run.html">Run a Binary Target</a></li>
</ul>
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