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class="sidebar-link">Disassembling and Decompiling</a></li><li><a href="/java/jmx.html" aria-current="page" class="active sidebar-link">JMX</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/java/jmx.html#simple-example-with-platform-mbean-server" class="sidebar-link">Simple example with Platform MBean Server</a></li></ul></li><li><a href="/java/java-virtual-machine-jvm.html" class="sidebar-link">Java Virtual Machine (JVM)</a></li><li><a href="/java/xjc.html" class="sidebar-link">XJC</a></li><li><a href="/java/jvm-flags.html" class="sidebar-link">JVM Flags</a></li><li><a href="/java/jvm-tool-interface.html" class="sidebar-link">JVM Tool Interface</a></li><li><a href="/java/java-memory-management.html" class="sidebar-link">Java Memory Management</a></li><li><a href="/java/java-performance-tuning.html" class="sidebar-link">Java Performance Tuning</a></li><li><a href="/java/benchmarks.html" class="sidebar-link">Benchmarks</a></li><li><a href="/java/fileupload-to-aws.html" class="sidebar-link">FileUpload to AWS</a></li><li><a href="/java/appdynamics-and-tibco-businessworks-instrumentation-for-easy-integration.html" class="sidebar-link">AppDynamics and TIBCO BusinessWorks Instrumentation for Easy Integration</a></li><li><a href="/java/the-classpath.html" class="sidebar-link">The Classpath</a></li><li><a href="/java/resources-on-classpath.html" class="sidebar-link">Resources (on classpath)</a></li><li><a href="/java/contributors.html" class="sidebar-link">The Contributors</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="jmx"><a href="#jmx" class="header-anchor">#</a> JMX</h1> <p>The JMX technology provides the tools for building distributed, Web-based, modular and dynamic solutions for managing and monitoring devices, applications, and service-driven networks. By design, this standard is suitable for adapting legacy systems, implementing new management and monitoring solutions, and plugging into those of the future.</p> <h2 id="simple-example-with-platform-mbean-server"><a href="#simple-example-with-platform-mbean-server" class="header-anchor">#</a> Simple example with Platform MBean Server</h2> <p>Let's say we have some server that registers new users and greets them with some message. And we want to monitor this server and change some of it's parameters.</p> <p>First, we need an interface with our monitoring and control methods</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">UserCounterMBean</span> <span class="token punctuation">{</span>
<span class="token keyword">long</span> <span class="token function">getSleepTime</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">setSleepTime</span><span class="token punctuation">(</span><span class="token keyword">long</span> sleepTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">getUserCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">setUserCount</span><span class="token punctuation">(</span><span class="token keyword">int</span> userCount<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">String</span> <span class="token function">getGreetingString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">setGreetingString</span><span class="token punctuation">(</span><span class="token class-name">String</span> greetingString<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">void</span> <span class="token function">stop</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>And some simple implementation that will let us see how it's working and how we affect it</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">UserCounter</span> <span class="token keyword">implements</span> <span class="token class-name">UserCounterMBean</span><span class="token punctuation">,</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>
<span class="token keyword">private</span> <span class="token class-name">AtomicLong</span> sleepTime <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">AtomicLong</span><span class="token punctuation">(</span><span class="token number">10000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">private</span> <span class="token class-name">AtomicInteger</span> userCount <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">AtomicInteger</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">private</span> <span class="token class-name">AtomicReference</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> greetingString <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">AtomicReference</span><span class="token generics"><span class="token punctuation"><</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token string">"welcome"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">private</span> <span class="token class-name">AtomicBoolean</span> interrupted <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">AtomicBoolean</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">long</span> <span class="token function">getSleepTime</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> sleepTime<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setSleepTime</span><span class="token punctuation">(</span><span class="token keyword">long</span> sleepTime<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>sleepTime<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>sleepTime<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">getUserCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> userCount<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setUserCount</span><span class="token punctuation">(</span><span class="token keyword">int</span> userCount<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>userCount<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>userCount<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">getGreetingString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> greetingString<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setGreetingString</span><span class="token punctuation">(</span><span class="token class-name">String</span> greetingString<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>greetingString<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span>greetingString<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">stop</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>interrupted<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token annotation punctuation">@Override</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span>interrupted<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"User %d, %s%n"</span><span class="token punctuation">,</span> userCount<span class="token punctuation">.</span><span class="token function">incrementAndGet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> greetingString<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span>sleepTime<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> ignored<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>For simple example with local or remote management, we need to register our MBean:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>management<span class="token punctuation">.</span></span><span class="token class-name">InstanceAlreadyExistsException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>management<span class="token punctuation">.</span></span><span class="token class-name">MBeanRegistrationException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>management<span class="token punctuation">.</span></span><span class="token class-name">MBeanServer</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>management<span class="token punctuation">.</span></span><span class="token class-name">MalformedObjectNameException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>management<span class="token punctuation">.</span></span><span class="token class-name">NotCompliantMBeanException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>management<span class="token punctuation">.</span></span><span class="token class-name">ObjectName</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>lang<span class="token punctuation">.</span>management<span class="token punctuation">.</span></span><span class="token class-name">ManagementFactory</span><span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Main</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">MalformedObjectNameException</span><span class="token punctuation">,</span> <span class="token class-name">NotCompliantMBeanException</span><span class="token punctuation">,</span> <span class="token class-name">InstanceAlreadyExistsException</span><span class="token punctuation">,</span> <span class="token class-name">MBeanRegistrationException</span><span class="token punctuation">,</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
<span class="token keyword">final</span> <span class="token class-name">UserCounter</span> userCounter <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">UserCounter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token class-name">MBeanServer</span> mBeanServer <span class="token operator">=</span> <span class="token class-name">ManagementFactory</span><span class="token punctuation">.</span><span class="token function">getPlatformMBeanServer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token class-name">ObjectName</span> objectName <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ObjectName</span><span class="token punctuation">(</span><span class="token string">"ServerManager:type=UserCounter"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
mBeanServer<span class="token punctuation">.</span><span class="token function">registerMBean</span><span class="token punctuation">(</span>userCounter<span class="token punctuation">,</span> objectName<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token class-name">Thread</span> thread <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span>userCounter<span class="token punctuation">)</span><span class="token punctuation">;</span>
thread<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
thread<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>After that we can run our application and connect to it via jConsole, which can be found in your <code>$JAVA_HOME/bin</code> directory.
First, we need to find our local java process with our application
<a href="https://i.stack.imgur.com/21xsM.png" target="_blank" rel="noopener noreferrer"><img src="https://i.stack.imgur.com/21xsM.png" alt="enter image description here"><span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></p> <p>then switch to MBeans tab and find that MBean that we used in our Main class as an <code>ObjectName</code> (in the example above it's <code>ServerManager</code>).
In <code>Attributes</code> section we can see out attributes. If you specified get method only, attribute will be readable but not writeable. If you specified both get and set methods, attribute would be readable and writeable.
<a href="https://i.stack.imgur.com/tlDAo.png" target="_blank" rel="noopener noreferrer"><img src="https://i.stack.imgur.com/tlDAo.png" alt="enter image description here"><span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></p> <p>Specified methods can be invoked in <code>Operations</code> section.
<a href="https://i.stack.imgur.com/9SFoH.png" target="_blank" rel="noopener noreferrer"><img src="https://i.stack.imgur.com/9SFoH.png" alt="enter image description here"><span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></p> <p>If you want to be able to use remote management, you will need additional JVM parameters, like:</p> <div class="language-java extra-class"><pre class="language-java"><code><span class="token operator">-</span><span class="token class-name">Dcom</span><span class="token punctuation">.</span>sun<span class="token punctuation">.</span>management<span class="token punctuation">.</span>jmxremote<span class="token operator">=</span><span class="token boolean">true</span> <span class="token comment">//true by default</span>
<span class="token operator">-</span><span class="token class-name">Dcom</span><span class="token punctuation">.</span>sun<span class="token punctuation">.</span>management<span class="token punctuation">.</span>jmxremote<span class="token punctuation">.</span>port<span class="token operator">=</span><span class="token number">36006</span>
<span class="token operator">-</span><span class="token class-name">Dcom</span><span class="token punctuation">.</span>sun<span class="token punctuation">.</span>management<span class="token punctuation">.</span>jmxremote<span class="token punctuation">.</span>authenticate<span class="token operator">=</span><span class="token boolean">false</span>
<span class="token operator">-</span><span class="token class-name">Dcom</span><span class="token punctuation">.</span>sun<span class="token punctuation">.</span>management<span class="token punctuation">.</span>jmxremote<span class="token punctuation">.</span>ssl<span class="token operator">=</span><span class="token boolean">false</span>
</code></pre></div><p>These parameters can be found in <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html" target="_blank" rel="noopener noreferrer">Chapter 2 of JMX guides<span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a>. After that you will be able to connect to your application via jConsole remotely with <code>jconsole host:port</code> or with specifying <code>host:port</code> or <code>service:jmx:rmi:///jndi/rmi://hostName:portNum/jmxrmi</code> in jConsole GUI.</p> <p>Useful links:</p> <ul><li><a href="https://docs.oracle.com/javase/8/docs/technotes/guides/management/overview.html" target="_blank" rel="noopener noreferrer">JMX guides<span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></li> <li><a href="http://www.oracle.com/us/technologies/java/best-practices-jsp-136021.html" target="_blank" rel="noopener noreferrer">JMX Best practices<span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></a></li></ul></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/devtut/generate/edit/master/docs/java/jmx.md" target="_blank" rel="noopener noreferrer">Edit this page on GitHub</a> <span><svg 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" class="icon outbound"><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="sr-only">(opens new window)</span></span></div> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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