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rel="noopener noreferrer"><code>ognl</code> online tutorial<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></p><div class="custom-container tip"><p class="custom-container-title">TIP</p><p>Execute ognl expression.</p></div><p>Since 3.0.5.</p><h2 id="parameters" tabindex="-1"><a class="header-anchor" href="#parameters" aria-hidden="true">#</a> Parameters</h2><table><thead><tr><th style="text-align:right;">Name</th><th style="text-align:left;">Specification</th></tr></thead><tbody><tr><td style="text-align:right;"><em>express</em></td><td style="text-align:left;">expression to be executed</td></tr><tr><td style="text-align:right;"><code>[c:]</code></td><td style="text-align:left;">The hashcode of the ClassLoader that executes the expression, default ClassLoader is SystemClassLoader.</td></tr><tr><td style="text-align:right;"><code>[classLoaderClass:]</code></td><td style="text-align:left;">The class name of the ClassLoader that executes the expression.</td></tr><tr><td style="text-align:right;">[x]</td><td style="text-align:left;">Expand level of object (1 by default).</td></tr></tbody></table><h2 id="usage" tabindex="-1"><a class="header-anchor" href="#usage" aria-hidden="true">#</a> Usage</h2><ul><li><a href="https://github.com/alibaba/arthas/issues/71" target="_blank" rel="noopener noreferrer">Special usages<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></li><li><a href="https://commons.apache.org/dormant/commons-ognl/language-guide.html" target="_blank" rel="noopener noreferrer">OGNL official guide<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></li></ul><p>Call static method:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ ognl <span class="token string">'@java.lang.System@out.println("hello")'</span>
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null
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div></div></div><p>Get static field:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ ognl <span class="token string">'@demo.MathGame@random'</span>
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@Random<span class="token punctuation">[</span>
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<span class="token assign-left variable">serialVersionUID</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">3905348978240129619</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">seed</span><span class="token operator">=</span>@AtomicLong<span class="token punctuation">[</span><span class="token number">125451474443703</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">multiplier</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">25214903917</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">addend</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">11</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">mask</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">281474976710655</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">DOUBLE_UNIT</span><span class="token operator">=</span>@Double<span class="token punctuation">[</span><span class="token number">1</span>.1102230246251565E-16<span class="token punctuation">]</span>,
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<span class="token assign-left variable">BadBound</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>bound must be positive<span class="token punctuation">]</span>,
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<span class="token assign-left variable">BadRange</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>bound must be greater than origin<span class="token punctuation">]</span>,
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<span class="token assign-left variable">BadSize</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>size must be non-negative<span class="token punctuation">]</span>,
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<span class="token assign-left variable">seedUniquifier</span><span class="token operator">=</span>@AtomicLong<span class="token punctuation">[</span>-3282039941672302964<span class="token punctuation">]</span>,
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<span class="token assign-left variable">nextNextGaussian</span><span class="token operator">=</span>@Double<span class="token punctuation">[</span><span class="token number">0.0</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">haveNextNextGaussian</span><span class="token operator">=</span>@Boolean<span class="token punctuation">[</span>false<span class="token punctuation">]</span>,
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<span class="token assign-left variable">serialPersistentFields</span><span class="token operator">=</span>@ObjectStreamField<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span>isEmpty<span class="token operator">=</span>false<span class="token punctuation">;</span><span class="token assign-left variable">size</span><span class="token operator">=</span><span class="token number">3</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">unsafe</span><span class="token operator">=</span>@Unsafe<span class="token punctuation">[</span>sun.misc.Unsafe@28ea5898<span class="token punctuation">]</span>,
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<span class="token assign-left variable">seedOffset</span><span class="token operator">=</span>@Long<span class="token punctuation">[</span><span class="token number">24</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Specify ClassLoader by hashcode:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ classloader <span class="token parameter variable">-t</span>
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+-BootstrapClassLoader
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+-jdk.internal.loader.ClassLoaders<span class="token variable">$PlatformClassLoader</span>@301ec38b
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+-com.taobao.arthas.agent.ArthasClassloader@472067c7
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+-jdk.internal.loader.ClassLoaders<span class="token variable">$AppClassLoader</span>@4b85612c
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+-org.springframework.boot.loader.LaunchedURLClassLoader@7f9a81e8
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$ ognl <span class="token parameter variable">-c</span> 7f9a81e8 @org.springframework.boot.SpringApplication@logger
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@Slf4jLocationAwareLog<span class="token punctuation">[</span>
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<span class="token assign-left variable">FQCN</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>org.apache.commons.logging.LogAdapter<span class="token variable">$Slf4jLocationAwareLog</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">name</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>org.springframework.boot.SpringApplication<span class="token punctuation">]</span>,
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<span class="token assign-left variable">logger</span><span class="token operator">=</span>@Logger<span class="token punctuation">[</span>Logger<span class="token punctuation">[</span>org.springframework.boot.SpringApplication<span class="token punctuation">]</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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$
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Note that the hashcode changes, you need to check the current ClassLoader information first, and extract the hashcode corresponding to the ClassLoader.</p><p>For ClassLoader with only unique instance, it can be specified by class name, which is more convenient to use:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ ognl <span class="token parameter variable">--classLoaderClass</span> org.springframework.boot.loader.LaunchedURLClassLoader @org.springframework.boot.SpringApplication@logger
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@Slf4jLocationAwareLog<span class="token punctuation">[</span>
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<span class="token assign-left variable">FQCN</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>org.apache.commons.logging.LogAdapter<span class="token variable">$Slf4jLocationAwareLog</span><span class="token punctuation">]</span>,
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<span class="token assign-left variable">name</span><span class="token operator">=</span>@String<span class="token punctuation">[</span>org.springframework.boot.SpringApplication<span class="token punctuation">]</span>,
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<span class="token assign-left variable">logger</span><span class="token operator">=</span>@Logger<span class="token punctuation">[</span>Logger<span class="token punctuation">[</span>org.springframework.boot.SpringApplication<span class="token punctuation">]</span><span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>Execute a multi-line expression, and return a list:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ ognl <span class="token string">'#value1=@System@getProperty("java.home"), #value2=@System@getProperty("java.runtime.name"), {#value1, #value2}'</span>
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@ArrayList<span class="token punctuation">[</span>
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@String<span class="token punctuation">[</span>/opt/java/8.0.181-zulu/jre<span class="token punctuation">]</span>,
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@String<span class="token punctuation">[</span>OpenJDK Runtime Environment<span class="token punctuation">]</span>,
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<span class="token punctuation">]</span>
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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/en/doc/ognl.md" rel="noopener noreferrer" target="_blank" aria-label="Edit this page on GitHub"><!--[--><!--]--><span>Edit this page on GitHub</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span><!--[--><!--]--></a></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">Contributors: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: i@fatpandac.com">Fatpandac</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: haoyixing@kuaishou.com">haoyixing</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hollowman186@vip.qq.com">Hollow Man</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: kylixs@qq.com">gongdewei</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><span class="prev"><a href="/en/doc/monitor.html" class="" aria-label="monitor"><!--[--><!--]--> monitor <!--[--><!--]--></a></span><span class="next"><a href="/en/doc/options.html" class="" aria-label="options"><!--[--><!--]--> options <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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