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<div class="section" id="ognl">
<span id="ognl"></span><h1>ognl<a class="headerlink" href="#ognl" title="Permalink to this headline">¶</a></h1>
<blockquote>
<div>Execute ognl expression.</div></blockquote>
<p>Since 3.0.5.</p>
<div class="section" id="parameters">
<span id="parameters"></span><h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
<table border="1" class="docutils">
<thead>
<tr>
<th align="right">Name</th>
<th align="left">Specification</th>
</tr>
</thead>
<tbody>
<tr>
<td align="right"><em>express</em></td>
<td align="left">expression to be executed</td>
</tr>
<tr>
<td align="right"><code>[c:]</code></td>
<td align="left">The hashcode of the ClassLoader that executes the expression, default ClassLoader is SystemClassLoader.</td>
</tr>
<tr>
<td align="right">[x]</td>
<td align="left">Expand level of object (1 by default).</td>
</tr>
</tbody>
</table></div>
<div class="section" id="usage">
<span id="usage"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<div class="toctree-wrapper compound">
<ul>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">Special usages</a></li>
<li class="toctree-l1"><a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL official guide</a></li>
</ul>
</div>
<p>Call static method:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'@java.lang.System@out.println("hello")'</span>
null
</pre></div>
</div>
<p>Get static field:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'@demo.MathGame@random'</span>
@Random<span class="o">[</span>
<span class="nv">serialVersionUID</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">3905348978240129619</span><span class="o">]</span>,
<span class="nv">seed</span><span class="o">=</span>@AtomicLong<span class="o">[</span><span class="m">125451474443703</span><span class="o">]</span>,
<span class="nv">multiplier</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">25214903917</span><span class="o">]</span>,
<span class="nv">addend</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">11</span><span class="o">]</span>,
<span class="nv">mask</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">281474976710655</span><span class="o">]</span>,
<span class="nv">DOUBLE_UNIT</span><span class="o">=</span>@Double<span class="o">[</span><span class="m">1</span>.1102230246251565E-16<span class="o">]</span>,
<span class="nv">BadBound</span><span class="o">=</span>@String<span class="o">[</span>bound must be positive<span class="o">]</span>,
<span class="nv">BadRange</span><span class="o">=</span>@String<span class="o">[</span>bound must be greater than origin<span class="o">]</span>,
<span class="nv">BadSize</span><span class="o">=</span>@String<span class="o">[</span>size must be non-negative<span class="o">]</span>,
<span class="nv">seedUniquifier</span><span class="o">=</span>@AtomicLong<span class="o">[</span>-3282039941672302964<span class="o">]</span>,
<span class="nv">nextNextGaussian</span><span class="o">=</span>@Double<span class="o">[</span><span class="m">0</span>.0<span class="o">]</span>,
<span class="nv">haveNextNextGaussian</span><span class="o">=</span>@Boolean<span class="o">[</span>false<span class="o">]</span>,
<span class="nv">serialPersistentFields</span><span class="o">=</span>@ObjectStreamField<span class="o">[][</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">3</span><span class="o">]</span>,
<span class="nv">unsafe</span><span class="o">=</span>@Unsafe<span class="o">[</span>sun.misc.Unsafe@28ea5898<span class="o">]</span>,
<span class="nv">seedOffset</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">24</span><span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
<p>Execute a multi-line expression, and return a list:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'#value1=@System@getProperty("java.home"), #value2=@System@getProperty("java.runtime.name"), {#value1, #value2}'</span>
@ArrayList<span class="o">[</span>
@String<span class="o">[</span>/opt/java/8.0.181-zulu/jre<span class="o">]</span>,
@String<span class="o">[</span>OpenJDK Runtime Environment<span class="o">]</span>,
<span class="o">]</span>
</pre></div>
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