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[https://github.com/alibaba/arthas/issues/44](https://github.com/alibaba/arthas/issues/44) [https://github.com/alibaba/arthas/issues/44](https://github.com/alibaba/arthas/issues/44)
#### com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded ##### target process not responding or HotSpot VM not loaded
com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
1. 检查当前用户和目标java进程是否一致。如果不一致，则切换到同一用户。JVM只能attach同样用户下的java 进程。 1. 检查当前用户和目标java进程是否一致。如果不一致，则切换到同一用户。JVM只能attach同样用户下的java 进程。
2. 尝试使用 `jstack -l $pid`，如果进程没有反应，则说明进程可能假死，无法响应JVM attach信号。所以同样基于attach机制的Arthas无法工作。尝试使用`jmap` heapdump后分析。 2. 尝试使用 `jstack -l $pid`，如果进程没有反应，则说明进程可能假死，无法响应JVM attach信号。所以同样基于attach机制的Arthas无法工作。尝试使用`jmap` heapdump后分析。

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[https://github.com/alibaba/arthas/issues/44](https://github.com/alibaba/arthas/issues/44) [https://github.com/alibaba/arthas/issues/44](https://github.com/alibaba/arthas/issues/44)
#### com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded ##### target process not responding or HotSpot VM not loaded
com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded
1. Check whether the current user and the target java process are consistent. If they are inconsistent, switch to the same user. JVM can only attach java processes under the same user. 1. Check whether the current user and the target java process are consistent. If they are inconsistent, switch to the same user. JVM can only attach java processes under the same user.
2. Try to use `jstack -l $pid`. If the process does not respond, it means that the process may freeze and fail to respond to the JVM attach signal. So Arthas based on the attach mechanism cannot work. Try to use `jmap` heapdump to analyze. 2. Try to use `jstack -l $pid`. If the process does not respond, it means that the process may freeze and fail to respond to the JVM attach signal. So Arthas based on the attach mechanism cannot work. Try to use `jmap` heapdump to analyze.

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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case">User cases</a></li> <li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case">User cases</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">FAQ</a><ul> <li class="toctree-l1 current"><a class="current reference internal" href="#">FAQ</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#how-much-impact-does-arthas-attach-have-on-the-performance-of-the-original-process">How much impact does Arthas attach have on the performance of the original process?</a></li> <li class="toctree-l2"><a class="reference internal" href="#how-much-impact-does-arthas-attach-have-on-the-performance-of-the-original-process">How much impact does Arthas attach have on the performance of the original process?</a></li>
<li class="toctree-l2"><a class="reference internal" href="#com-sun-tools-attach-attachnotsupportedexception-unable-to-open-socket-file-target-process-not-responding-or-hotspot-vm-not-loaded">com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded</a><ul> <li class="toctree-l2"><a class="reference internal" href="#target-process-not-responding-or-hotspot-vm-not-loaded">target process not responding or HotSpot VM not loaded</a></li>
<li class="toctree-l3"><a class="reference internal" href="#can-commands-such-as-trace-watch-enhance-the-classes-in-jdk">Can commands such as trace/watch enhance the classes in jdk?</a></li> <li class="toctree-l2"><a class="reference internal" href="#can-commands-such-as-trace-watch-enhance-the-classes-in-jdk">Can commands such as trace/watch enhance the classes in jdk?</a></li>
<li class="toctree-l3"><a class="reference internal" href="#how-to-view-the-result-in-json-format">How to view the result in <code class="docutils literal notranslate"><span class="pre">json</span></code> format</a></li> <li class="toctree-l2"><a class="reference internal" href="#how-to-view-the-result-in-json-format">How to view the result in <code class="docutils literal notranslate"><span class="pre">json</span></code> format</a></li>
<li class="toctree-l3"><a class="reference internal" href="#can-arthas-trace-native-methods">Can arthas trace native methods</a></li> <li class="toctree-l2"><a class="reference internal" href="#can-arthas-trace-native-methods">Can arthas trace native methods</a></li>
<li class="toctree-l3"><a class="reference internal" href="#can-arthas-view-the-value-of-a-variable-in-memory">Can arthas view the value of a variable in memory?</a></li> <li class="toctree-l2"><a class="reference internal" href="#can-arthas-view-the-value-of-a-variable-in-memory">Can arthas view the value of a variable in memory?</a></li>
<li class="toctree-l3"><a class="reference internal" href="#how-to-filter-method-with-the-same-name">How to filter method with the same name?</a></li> <li class="toctree-l2"><a class="reference internal" href="#how-to-filter-method-with-the-same-name">How to filter method with the same name?</a></li>
<li class="toctree-l3"><a class="reference internal" href="#how-to-watch-or-trace-constructor">How to watch or trace constructor?</a></li> <li class="toctree-l2"><a class="reference internal" href="#how-to-watch-or-trace-constructor">How to watch or trace constructor?</a></li>
<li class="toctree-l3"><a class="reference internal" href="#java-lang-classformaterror-null-skywalking-arthas-compatible-use">java.lang.ClassFormatError: null, skywalking arthas compatible use</a></li> <li class="toctree-l2"><a class="reference internal" href="#java-lang-classformaterror-null-skywalking-arthas-compatible-use">java.lang.ClassFormatError: null, skywalking arthas compatible use</a></li>
</ul>
</li>
</ul> </ul>
</li> </li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas">Star me at GitHub</a></li> <li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas">Star me at GitHub</a></li>
@ -205,36 +203,38 @@
<h2>How much impact does Arthas attach have on the performance of the original process?<a class="headerlink" href="#how-much-impact-does-arthas-attach-have-on-the-performance-of-the-original-process" title="Permalink to this headline"></a></h2> <h2>How much impact does Arthas attach have on the performance of the original process?<a class="headerlink" href="#how-much-impact-does-arthas-attach-have-on-the-performance-of-the-original-process" title="Permalink to this headline"></a></h2>
<p><a class="reference external" href="https://github.com/alibaba/arthas/issues/44">https://github.com/alibaba/arthas/issues/44</a></p> <p><a class="reference external" href="https://github.com/alibaba/arthas/issues/44">https://github.com/alibaba/arthas/issues/44</a></p>
</div> </div>
<div class="section" id="com-sun-tools-attach-attachnotsupportedexception-unable-to-open-socket-file-target-process-not-responding-or-hotspot-vm-not-loaded"> <div class="section" id="target-process-not-responding-or-hotspot-vm-not-loaded">
<h2>com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded<a class="headerlink" href="#com-sun-tools-attach-attachnotsupportedexception-unable-to-open-socket-file-target-process-not-responding-or-hotspot-vm-not-loaded" title="Permalink to this headline"></a></h2> <h2>target process not responding or HotSpot VM not loaded<a class="headerlink" href="#target-process-not-responding-or-hotspot-vm-not-loaded" title="Permalink to this headline"></a></h2>
<p>com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded</p>
<ol class="simple"> <ol class="simple">
<li><p>Check whether the current user and the target java process are consistent. If they are inconsistent, switch to the same user. JVM can only attach java processes under the same user.</p></li> <li><p>Check whether the current user and the target java process are consistent. If they are inconsistent, switch to the same user. JVM can only attach java processes under the same user.</p></li>
<li><p>Try to use <code class="docutils literal notranslate"><span class="pre">jstack</span> <span class="pre">-l</span> <span class="pre">$pid</span></code>. If the process does not respond, it means that the process may freeze and fail to respond to the JVM attach signal. So Arthas based on the attach mechanism cannot work. Try to use <code class="docutils literal notranslate"><span class="pre">jmap</span></code> heapdump to analyze.</p></li> <li><p>Try to use <code class="docutils literal notranslate"><span class="pre">jstack</span> <span class="pre">-l</span> <span class="pre">$pid</span></code>. If the process does not respond, it means that the process may freeze and fail to respond to the JVM attach signal. So Arthas based on the attach mechanism cannot work. Try to use <code class="docutils literal notranslate"><span class="pre">jmap</span></code> heapdump to analyze.</p></li>
<li><p>Try to attach arthas-demo in <a class="reference internal" href="quick-start.html"><span class="doc">quick-start</span></a>.</p></li> <li><p>Try to attach arthas-demo in <a class="reference internal" href="quick-start.html"><span class="doc">quick-start</span></a>.</p></li>
</ol> </ol>
</div>
<div class="section" id="can-commands-such-as-trace-watch-enhance-the-classes-in-jdk"> <div class="section" id="can-commands-such-as-trace-watch-enhance-the-classes-in-jdk">
<h3>Can commands such as trace/watch enhance the classes in jdk?<a class="headerlink" href="#can-commands-such-as-trace-watch-enhance-the-classes-in-jdk" title="Permalink to this headline"></a></h3> <h2>Can commands such as trace/watch enhance the classes in jdk?<a class="headerlink" href="#can-commands-such-as-trace-watch-enhance-the-classes-in-jdk" title="Permalink to this headline"></a></h2>
<p>By default, classes beginning with <code class="docutils literal notranslate"><span class="pre">java.</span></code> are filtered out, but they can be turned on:</p> <p>By default, classes beginning with <code class="docutils literal notranslate"><span class="pre">java.</span></code> are filtered out, but they can be turned on:</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options unsafe true</pre></div> <div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options unsafe true</pre></div>
</div> </div>
<p>See more at <a class="reference internal" href="options.html"><span class="doc">options</span></a></p> <p>See more at <a class="reference internal" href="options.html"><span class="doc">options</span></a></p>
</div> </div>
<div class="section" id="how-to-view-the-result-in-json-format"> <div class="section" id="how-to-view-the-result-in-json-format">
<h3>How to view the result in <code class="docutils literal notranslate"><span class="pre">json</span></code> format<a class="headerlink" href="#how-to-view-the-result-in-json-format" title="Permalink to this headline"></a></h3> <h2>How to view the result in <code class="docutils literal notranslate"><span class="pre">json</span></code> format<a class="headerlink" href="#how-to-view-the-result-in-json-format" title="Permalink to this headline"></a></h2>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options json-format true</pre></div> <div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options json-format true</pre></div>
</div> </div>
<p>See more at <a class="reference internal" href="options.html"><span class="doc">options</span></a></p> <p>See more at <a class="reference internal" href="options.html"><span class="doc">options</span></a></p>
</div> </div>
<div class="section" id="can-arthas-trace-native-methods"> <div class="section" id="can-arthas-trace-native-methods">
<h3>Can arthas trace native methods<a class="headerlink" href="#can-arthas-trace-native-methods" title="Permalink to this headline"></a></h3> <h2>Can arthas trace native methods<a class="headerlink" href="#can-arthas-trace-native-methods" title="Permalink to this headline"></a></h2>
<p>No.</p> <p>No.</p>
</div> </div>
<div class="section" id="can-arthas-view-the-value-of-a-variable-in-memory"> <div class="section" id="can-arthas-view-the-value-of-a-variable-in-memory">
<h3>Can arthas view the value of a variable in memory?<a class="headerlink" href="#can-arthas-view-the-value-of-a-variable-in-memory" title="Permalink to this headline"></a></h3> <h2>Can arthas view the value of a variable in memory?<a class="headerlink" href="#can-arthas-view-the-value-of-a-variable-in-memory" title="Permalink to this headline"></a></h2>
<p>No. But you can use some tricks to intercept the object with the <code class="docutils literal notranslate"><span class="pre">tt</span></code> command, or fetch it from a static method.</p> <p>No. But you can use some tricks to intercept the object with the <code class="docutils literal notranslate"><span class="pre">tt</span></code> command, or fetch it from a static method.</p>
</div> </div>
<div class="section" id="how-to-filter-method-with-the-same-name"> <div class="section" id="how-to-filter-method-with-the-same-name">
<h3>How to filter method with the same name?<a class="headerlink" href="#how-to-filter-method-with-the-same-name" title="Permalink to this headline"></a></h3> <h2>How to filter method with the same name?<a class="headerlink" href="#how-to-filter-method-with-the-same-name" title="Permalink to this headline"></a></h2>
<p>You can used all variables in <a class="reference internal" href="advice-class.html"><span class="doc">fundamental fields in expressions</span></a> for the condition express to filter method with the same name, you can use the number of parameters <code class="docutils literal notranslate"><span class="pre">params.length</span> <span class="pre">==1</span></code>,parameter type <code class="docutils literal notranslate"><span class="pre">params[0]</span> <span class="pre">instanceof</span> <span class="pre">java.lang.Integer</span></code>,return value type <code class="docutils literal notranslate"><span class="pre">returnObj</span> <span class="pre">instanceof</span> <span class="pre">java.util.List</span></code> and so on in one or more combinations as condition express.</p> <p>You can used all variables in <a class="reference internal" href="advice-class.html"><span class="doc">fundamental fields in expressions</span></a> for the condition express to filter method with the same name, you can use the number of parameters <code class="docutils literal notranslate"><span class="pre">params.length</span> <span class="pre">==1</span></code>,parameter type <code class="docutils literal notranslate"><span class="pre">params[0]</span> <span class="pre">instanceof</span> <span class="pre">java.lang.Integer</span></code>,return value type <code class="docutils literal notranslate"><span class="pre">returnObj</span> <span class="pre">instanceof</span> <span class="pre">java.util.List</span></code> and so on in one or more combinations as condition express.</p>
<p>You can use <code class="docutils literal notranslate"><span class="pre">-v</span></code> to view the condition express result <a class="reference external" href="https://github.com/alibaba/arthas/issues/1348">https://github.com/alibaba/arthas/issues/1348</a></p> <p>You can use <code class="docutils literal notranslate"><span class="pre">-v</span></code> to view the condition express result <a class="reference external" href="https://github.com/alibaba/arthas/issues/1348">https://github.com/alibaba/arthas/issues/1348</a></p>
<p>example <a class="reference internal" href="quick-start.html"><span class="doc">arthas-demo</span></a></p> <p>example <a class="reference internal" href="quick-start.html"><span class="doc">arthas-demo</span></a></p>
@ -242,16 +242,15 @@
</div> </div>
</div> </div>
<div class="section" id="how-to-watch-or-trace-constructor"> <div class="section" id="how-to-watch-or-trace-constructor">
<h3>How to watch or trace constructor?<a class="headerlink" href="#how-to-watch-or-trace-constructor" title="Permalink to this headline"></a></h3> <h2>How to watch or trace constructor?<a class="headerlink" href="#how-to-watch-or-trace-constructor" title="Permalink to this headline"></a></h2>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">watch demo.MathGame &lt;init&gt; &#x27;{params,returnObj,throwExp}&#x27; -v -n 5 -x 3 &#x27;1==1&#x27;</pre></div> <div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">watch demo.MathGame &lt;init&gt; &#x27;{params,returnObj,throwExp}&#x27; -v -n 5 -x 3 &#x27;1==1&#x27;</pre></div>
</div> </div>
</div> </div>
<div class="section" id="java-lang-classformaterror-null-skywalking-arthas-compatible-use"> <div class="section" id="java-lang-classformaterror-null-skywalking-arthas-compatible-use">
<h3>java.lang.ClassFormatError: null, skywalking arthas compatible use<a class="headerlink" href="#java-lang-classformaterror-null-skywalking-arthas-compatible-use" title="Permalink to this headline"></a></h3> <h2>java.lang.ClassFormatError: null, skywalking arthas compatible use<a class="headerlink" href="#java-lang-classformaterror-null-skywalking-arthas-compatible-use" title="Permalink to this headline"></a></h2>
<p>When error log appear <code class="docutils literal notranslate"><span class="pre">java.lang.ClassFormatError:</span> <span class="pre">null</span></code>, it is usually modified by other bytecode tools that are not compatible with arthas modified bytecode.</p> <p>When error log appear <code class="docutils literal notranslate"><span class="pre">java.lang.ClassFormatError:</span> <span class="pre">null</span></code>, it is usually modified by other bytecode tools that are not compatible with arthas modified bytecode.</p>
<p>For example: use skywalking V8.1.0 below <a class="reference external" href="https://github.com/alibaba/arthas/issues/1141">cannot trace, watch classes enhanced by skywalking agent</a>, V8.1.0 or above is compatible, refer to skywalking configuration for more details. <a class="reference external" href="https://github.com/apache/skywalking/blob/v8.1.0/docs/en/FAQ/Compatible-with-other-javaagent-bytecode-processing">skywalking compatible with other javaagent bytecode processing</a>.</p> <p>For example: use skywalking V8.1.0 below <a class="reference external" href="https://github.com/alibaba/arthas/issues/1141">cannot trace, watch classes enhanced by skywalking agent</a>, V8.1.0 or above is compatible, refer to skywalking configuration for more details. <a class="reference external" href="https://github.com/apache/skywalking/blob/v8.1.0/docs/en/FAQ/Compatible-with-other-javaagent-bytecode-processing">skywalking compatible with other javaagent bytecode processing</a>.</p>
</div> </div>
</div>
</div> </div>

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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case">用户案例</a></li> <li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case">用户案例</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">FAQ/常见问题</a><ul> <li class="toctree-l1 current"><a class="current reference internal" href="#">FAQ/常见问题</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#arthas-attach">Arthas attach之后对原进程性能有多大的影响</a></li> <li class="toctree-l2"><a class="reference internal" href="#arthas-attach">Arthas attach之后对原进程性能有多大的影响</a></li>
<li class="toctree-l2"><a class="reference internal" href="#com-sun-tools-attach-attachnotsupportedexception-unable-to-open-socket-file-target-process-not-responding-or-hotspot-vm-not-loaded">com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded</a><ul> <li class="toctree-l2"><a class="reference internal" href="#target-process-not-responding-or-hotspot-vm-not-loaded">target process not responding or HotSpot VM not loaded</a></li>
<li class="toctree-l3"><a class="reference internal" href="#trace-watchjdk">trace/watch等命令能否增强jdk里的类？</a></li> <li class="toctree-l2"><a class="reference internal" href="#trace-watchjdk">trace/watch等命令能否增强jdk里的类？</a></li>
<li class="toctree-l3"><a class="reference internal" href="#json">怎么以<code class="docutils literal notranslate"><span class="pre">json</span></code>格式查看结果</a></li> <li class="toctree-l2"><a class="reference internal" href="#json">怎么以<code class="docutils literal notranslate"><span class="pre">json</span></code>格式查看结果</a></li>
<li class="toctree-l3"><a class="reference internal" href="#arthas-native">Arthas能否跟踪 native 函数</a></li> <li class="toctree-l2"><a class="reference internal" href="#arthas-native">Arthas能否跟踪 native 函数</a></li>
<li class="toctree-l3"><a class="reference internal" href="#id1">能不能查看内存里某个变量的值</a></li> <li class="toctree-l2"><a class="reference internal" href="#id1">能不能查看内存里某个变量的值</a></li>
<li class="toctree-l3"><a class="reference internal" href="#id2">方法同名过滤</a></li> <li class="toctree-l2"><a class="reference internal" href="#id2">方法同名过滤</a></li>
<li class="toctree-l3"><a class="reference internal" href="#watchtrace">怎么watch、trace 构造函数 ？</a></li> <li class="toctree-l2"><a class="reference internal" href="#watchtrace">怎么watch、trace 构造函数 ？</a></li>
<li class="toctree-l3"><a class="reference internal" href="#java-lang-classformaterror-nullskywalking-arthas">java.lang.ClassFormatError: null、skywalking arthas 兼容使用</a></li> <li class="toctree-l2"><a class="reference internal" href="#java-lang-classformaterror-nullskywalking-arthas">java.lang.ClassFormatError: null、skywalking arthas 兼容使用</a></li>
</ul>
</li>
</ul> </ul>
</li> </li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas">Star me at GitHub</a></li> <li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas">Star me at GitHub</a></li>
@ -210,36 +208,38 @@
<h2>Arthas attach之后对原进程性能有多大的影响<a class="headerlink" href="#arthas-attach" title="永久链接至标题"></a></h2> <h2>Arthas attach之后对原进程性能有多大的影响<a class="headerlink" href="#arthas-attach" title="永久链接至标题"></a></h2>
<p><a class="reference external" href="https://github.com/alibaba/arthas/issues/44">https://github.com/alibaba/arthas/issues/44</a></p> <p><a class="reference external" href="https://github.com/alibaba/arthas/issues/44">https://github.com/alibaba/arthas/issues/44</a></p>
</div> </div>
<div class="section" id="com-sun-tools-attach-attachnotsupportedexception-unable-to-open-socket-file-target-process-not-responding-or-hotspot-vm-not-loaded"> <div class="section" id="target-process-not-responding-or-hotspot-vm-not-loaded">
<h2>com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded<a class="headerlink" href="#com-sun-tools-attach-attachnotsupportedexception-unable-to-open-socket-file-target-process-not-responding-or-hotspot-vm-not-loaded" title="永久链接至标题"></a></h2> <h2>target process not responding or HotSpot VM not loaded<a class="headerlink" href="#target-process-not-responding-or-hotspot-vm-not-loaded" title="永久链接至标题"></a></h2>
<p>com.sun.tools.attach.AttachNotSupportedException: Unable to open socket file: target process not responding or HotSpot VM not loaded</p>
<ol class="simple"> <ol class="simple">
<li><p>检查当前用户和目标java进程是否一致。如果不一致，则切换到同一用户。JVM只能attach同样用户下的java 进程。</p></li> <li><p>检查当前用户和目标java进程是否一致。如果不一致，则切换到同一用户。JVM只能attach同样用户下的java 进程。</p></li>
<li><p>尝试使用 <code class="docutils literal notranslate"><span class="pre">jstack</span> <span class="pre">-l</span> <span class="pre">$pid</span></code>，如果进程没有反应，则说明进程可能假死，无法响应JVM attach信号。所以同样基于attach机制的Arthas无法工作。尝试使用<code class="docutils literal notranslate"><span class="pre">jmap</span></code> heapdump后分析。</p></li> <li><p>尝试使用 <code class="docutils literal notranslate"><span class="pre">jstack</span> <span class="pre">-l</span> <span class="pre">$pid</span></code>，如果进程没有反应，则说明进程可能假死，无法响应JVM attach信号。所以同样基于attach机制的Arthas无法工作。尝试使用<code class="docutils literal notranslate"><span class="pre">jmap</span></code> heapdump后分析。</p></li>
<li><p>尝试按<a class="reference internal" href="quick-start.html"><span class="doc">quick-start</span></a>里的方式attach arthas-demo。</p></li> <li><p>尝试按<a class="reference internal" href="quick-start.html"><span class="doc">quick-start</span></a>里的方式attach arthas-demo。</p></li>
</ol> </ol>
</div>
<div class="section" id="trace-watchjdk"> <div class="section" id="trace-watchjdk">
<h3>trace/watch等命令能否增强jdk里的类？<a class="headerlink" href="#trace-watchjdk" title="永久链接至标题"></a></h3> <h2>trace/watch等命令能否增强jdk里的类？<a class="headerlink" href="#trace-watchjdk" title="永久链接至标题"></a></h2>
<p>默认情况下会过滤掉<code class="docutils literal notranslate"><span class="pre">java.</span></code>开头的类，但可以通过参数开启。</p> <p>默认情况下会过滤掉<code class="docutils literal notranslate"><span class="pre">java.</span></code>开头的类，但可以通过参数开启。</p>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options unsafe true</pre></div> <div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options unsafe true</pre></div>
</div> </div>
<p>更多参考 <a class="reference internal" href="options.html"><span class="doc">options</span></a></p> <p>更多参考 <a class="reference internal" href="options.html"><span class="doc">options</span></a></p>
</div> </div>
<div class="section" id="json"> <div class="section" id="json">
<h3>怎么以<code class="docutils literal notranslate"><span class="pre">json</span></code>格式查看结果<a class="headerlink" href="#json" title="永久链接至标题"></a></h3> <h2>怎么以<code class="docutils literal notranslate"><span class="pre">json</span></code>格式查看结果<a class="headerlink" href="#json" title="永久链接至标题"></a></h2>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options json-format true</pre></div> <div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">options json-format true</pre></div>
</div> </div>
<p>更多参考 <a class="reference internal" href="options.html"><span class="doc">options</span></a></p> <p>更多参考 <a class="reference internal" href="options.html"><span class="doc">options</span></a></p>
</div> </div>
<div class="section" id="arthas-native"> <div class="section" id="arthas-native">
<h3>Arthas能否跟踪 native 函数<a class="headerlink" href="#arthas-native" title="永久链接至标题"></a></h3> <h2>Arthas能否跟踪 native 函数<a class="headerlink" href="#arthas-native" title="永久链接至标题"></a></h2>
<p>不能。</p> <p>不能。</p>
</div> </div>
<div class="section" id="id1"> <div class="section" id="id1">
<h3>能不能查看内存里某个变量的值<a class="headerlink" href="#id1" title="永久链接至标题"></a></h3> <h2>能不能查看内存里某个变量的值<a class="headerlink" href="#id1" title="永久链接至标题"></a></h2>
<p>不能。但可以用一些技巧，用<code class="docutils literal notranslate"><span class="pre">tt</span></code>命令拦截到对象，或者从静态函数里取到对象。</p> <p>不能。但可以用一些技巧，用<code class="docutils literal notranslate"><span class="pre">tt</span></code>命令拦截到对象，或者从静态函数里取到对象。</p>
</div> </div>
<div class="section" id="id2"> <div class="section" id="id2">
<h3>方法同名过滤<a class="headerlink" href="#id2" title="永久链接至标题"></a></h3> <h2>方法同名过滤<a class="headerlink" href="#id2" title="永久链接至标题"></a></h2>
<p>同名方法过滤可以通过匹配表达式,可以使用<a class="reference internal" href="advice-class.html"><span class="doc">表达式核心变量</span></a>中所有变量作为已知条件,可以通过判断参数个数<code class="docutils literal notranslate"><span class="pre">params.length</span> <span class="pre">==1</span></code>, 参数类型<code class="docutils literal notranslate"><span class="pre">params[0]</span> <span class="pre">instanceof</span> <span class="pre">java.lang.Integer</span></code>、返回值类型 <code class="docutils literal notranslate"><span class="pre">returnObj</span> <span class="pre">instanceof</span> <span class="pre">java.util.List</span></code> 等等一种或者多种组合进行过滤。</p> <p>同名方法过滤可以通过匹配表达式,可以使用<a class="reference internal" href="advice-class.html"><span class="doc">表达式核心变量</span></a>中所有变量作为已知条件,可以通过判断参数个数<code class="docutils literal notranslate"><span class="pre">params.length</span> <span class="pre">==1</span></code>, 参数类型<code class="docutils literal notranslate"><span class="pre">params[0]</span> <span class="pre">instanceof</span> <span class="pre">java.lang.Integer</span></code>、返回值类型 <code class="docutils literal notranslate"><span class="pre">returnObj</span> <span class="pre">instanceof</span> <span class="pre">java.util.List</span></code> 等等一种或者多种组合进行过滤。</p>
<p>可以使用 <code class="docutils literal notranslate"><span class="pre">-v</span></code> 查看观察匹配表达式的执行结果 <a class="reference external" href="https://github.com/alibaba/arthas/issues/1348">https://github.com/alibaba/arthas/issues/1348</a></p> <p>可以使用 <code class="docutils literal notranslate"><span class="pre">-v</span></code> 查看观察匹配表达式的执行结果 <a class="reference external" href="https://github.com/alibaba/arthas/issues/1348">https://github.com/alibaba/arthas/issues/1348</a></p>
<p>例子<a class="reference internal" href="quick-start.html"><span class="doc">arthas-demo</span></a></p> <p>例子<a class="reference internal" href="quick-start.html"><span class="doc">arthas-demo</span></a></p>
@ -247,16 +247,15 @@
</div> </div>
</div> </div>
<div class="section" id="watchtrace"> <div class="section" id="watchtrace">
<h3>怎么watch、trace 构造函数 ？<a class="headerlink" href="#watchtrace" title="永久链接至标题"></a></h3> <h2>怎么watch、trace 构造函数 ？<a class="headerlink" href="#watchtrace" title="永久链接至标题"></a></h2>
<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">watch demo.MathGame &lt;init&gt; &#x27;{params,returnObj,throwExp}&#x27; -v -n 5 -x 3 &#x27;1==1&#x27;</pre></div> <div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">watch demo.MathGame &lt;init&gt; &#x27;{params,returnObj,throwExp}&#x27; -v -n 5 -x 3 &#x27;1==1&#x27;</pre></div>
</div> </div>
</div> </div>
<div class="section" id="java-lang-classformaterror-nullskywalking-arthas"> <div class="section" id="java-lang-classformaterror-nullskywalking-arthas">
<h3>java.lang.ClassFormatError: null、skywalking arthas 兼容使用<a class="headerlink" href="#java-lang-classformaterror-nullskywalking-arthas" title="永久链接至标题"></a></h3> <h2>java.lang.ClassFormatError: null、skywalking arthas 兼容使用<a class="headerlink" href="#java-lang-classformaterror-nullskywalking-arthas" title="永久链接至标题"></a></h2>
<p>当出现这个错误日志<code class="docutils literal notranslate"><span class="pre">java.lang.ClassFormatError:</span> <span class="pre">null</span></code>,通常情况下都是被其他字节码工具修改过与arthas修改字节码不兼容。</p> <p>当出现这个错误日志<code class="docutils literal notranslate"><span class="pre">java.lang.ClassFormatError:</span> <span class="pre">null</span></code>,通常情况下都是被其他字节码工具修改过与arthas修改字节码不兼容。</p>
<p>比如: 使用 skywalking V8.1.0 以下版本 <a class="reference external" href="https://github.com/alibaba/arthas/issues/1141">无法trace、watch 被skywalking agent 增强过的类</a>, V8.1.0 以上版本可以兼容使用,更多参考skywalking配置 <a class="reference external" href="https://github.com/apache/skywalking/blob/v8.1.0/docs/en/FAQ/Compatible-with-other-javaagent-bytecode-processing">skywalking compatible with other javaagent bytecode processing</a>。</p> <p>比如: 使用 skywalking V8.1.0 以下版本 <a class="reference external" href="https://github.com/alibaba/arthas/issues/1141">无法trace、watch 被skywalking agent 增强过的类</a>, V8.1.0 以上版本可以兼容使用,更多参考skywalking配置 <a class="reference external" href="https://github.com/apache/skywalking/blob/v8.1.0/docs/en/FAQ/Compatible-with-other-javaagent-bytecode-processing">skywalking compatible with other javaagent bytecode processing</a>。</p>
</div> </div>
</div>
</div> </div>

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