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multiple_jvm_versions.html
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multiple_jvm_versions.html
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<h2 id="problem">Problem</h2>
<p>You want to compile and/or run different test or binary targets using different JVMs.</p>
<p>Or, you need to specify command-line options globally for the JVM on a per-JVM version basis. For
example, using <code>--add-opens</code> flags, but only when running on JVMs that support it.</p>
<h2 id="solution">Solution</h2>
<p>In your global configuration (most likely <code>pants.toml</code>), declare JVM platforms using the
<code>jvm-platform</code> configuration section to define the set of available platforms.</p>
<p>On targets, add the named argument <code>runtime_platform</code> set to the name of one of the platforms
defined in <code>jvm-platform</code>. That will tell pants to use that platform when running that target in a
JVM.</p>
<div class="codehilite"><pre><span></span>runtime_platform="java8",
</pre></div>
<p>To compile with a specific platform, set the <code>platform</code> on the target.</p>
<div class="codehilite"><pre><span></span>platform="java8",
</pre></div>
<p>To set the defaults for <code>platform</code> and <code>runtime_platform</code>, add <code>default_platform</code> and
<code>default_runtime_platform</code> to your global config.</p>
<h2 id="discussion">Discussion</h2>
<p>Here are the different configurations that you can set when defining a JVM platform in your global
configuration.</p>
<p>For compile time configuration, there are three main attributes, <code>source</code>, <code>target</code> and <code>args</code>.
* <code>source</code> and <code>target</code> map directly to the javac arguments of the same name, though they accept
more aliases than javac. Up to JDK 8, you can use either <code>1.X</code> or <code>X</code>. For 9 and up, you can't
include the <code>1.</code>.
* <code>args</code>, allows the platform to specify additional, global to that platform, compile arguments.</p>
<p>For runtime configuration, <code>target</code>, <code>strict</code> and <code>jvm_options</code> are used. <code>target</code> is used to
determine the minimum version of the JVM to use. <code>strict</code> forces the JVM used to be exactly the
<code>target</code> version. <code>jvm_options</code> is used by some tasks to allow platforms to specify platform
specific JVM options. These can make transitions between JVM versions smoother by allowing
compatibility options to be provided globally.</p>
<p>An example pants.toml config might look like this:</p>
<div class="codehilite"><pre><span></span>[jvm-platform]
default_platform: java8
default_runtime_platform: java10
platforms =
"""
{
'java8': { 'source': '8', 'target': '8', 'args': [] },
'java10': {'source': '10', 'target': '10', 'args': [],
'strict': True,
'jvm_options': [
# --add-opens is a 9+ flag, that doesn't work with 8
'--add-opens=java.base/java.lang.reflect=ALL-UNNAMED'
] },
}
</pre></div>
<p>"""</p>
<h2 id="see-also">See Also</h2>
<ul>
<li><a href="jvm_options.html">Specify JVM Options</a></li>
<li><a href="run.html">Run a Binary Target</a></li>
</ul>
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