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<h2 title="Interface RuntimeMXBean" class="title">Interface RuntimeMXBean</h2>
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<dt>All Superinterfaces:</dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/PlatformManagedObject.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">PlatformManagedObject</a></code>, <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">RuntimeMXBean</a></code></dd>
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<dd><code><a href="internal/ExtendedRuntimeMXBeanImpl.html" title="class in com.ibm.lang.management.internal">ExtendedRuntimeMXBeanImpl</a></code></dd>
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<pre>public interface <span class="typeNameLabel">RuntimeMXBean</span>
extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">RuntimeMXBean</a></pre>
<div class="block">The OpenJ9 extension interface for the runtime system of the virtual machine.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Interface</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RuntimeMXBean.VMIdleStates.html" title="enum in com.ibm.lang.management">RuntimeMXBean.VMIdleStates</a></span></code></th>
<td class="colLast">
<div class="block">Defines the different states of <a href="#getVMIdleState()"><code>getVMIdleState()</code></a>.</div>
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<td class="colFirst"><code>double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCPULoad()">getCPULoad</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a double value which holds the system load average calculated for
the minute preceding the call, where <i>system load average</i> is taken
to mean the following:</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>long</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getProcessID()">getProcessID</a></span>()</code></th>
<td class="colLast">
<div class="block"><span class="deprecatedLabel">Deprecated, for removal: This API element is subject to removal in a future version.</span>
<div class="deprecationComment">As of Java 10.</div>
</div>
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<td class="colFirst"><code>double</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getVMGeneratedCPULoad()">getVMGeneratedCPULoad</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns a system load average calculated over the minute preceding
the call averaged over the number of CPU available to Java virtual
machine process.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getVmId()">getVmId</a></span>()</code></th>
<td class="colLast">
<div class="block">This is provided for the benefit of applications which use attach API to load JVMTI agents
into their own JVMs.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="RuntimeMXBean.VMIdleStates.html" title="enum in com.ibm.lang.management">RuntimeMXBean.VMIdleStates</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getVMIdleState()">getVMIdleState</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns current JVM Idle state.</div>
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<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isAttachApiInitialized()">isAttachApiInitialized</a></span>()</code></th>
<td class="colLast">
<div class="block">Query the state of the Attach API.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isAttachApiTerminated()">isAttachApiTerminated</a></span>()</code></th>
<td class="colLast">
<div class="block">Query the state of the Attach API.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isVMIdle()">isVMIdle</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<h3>Methods declared in interface&nbsp;java.lang.management.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/PlatformManagedObject.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">PlatformManagedObject</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/PlatformManagedObject.html?is-external=true#getObjectName()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getObjectName</a></code></li>
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<h3>Methods declared in interface&nbsp;java.lang.management.<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true" title="class or interface in java.lang.management" class="externalLink" target="_blank">RuntimeMXBean</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getBootClassPath()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getBootClassPath</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getClassPath()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getClassPath</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getInputArguments()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getInputArguments</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getLibraryPath()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getLibraryPath</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getManagementSpecVersion()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getManagementSpecVersion</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getName()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getName</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getPid()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getPid</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getSpecName()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getSpecName</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getSpecVendor()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getSpecVendor</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getSpecVersion()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getSpecVersion</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getStartTime()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getStartTime</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getSystemProperties()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getSystemProperties</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getUptime()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getUptime</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getVmName()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getVmName</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getVmVendor()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getVmVendor</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getVmVersion()" title="class or interface in java.lang.management" class="externalLink" target="_blank">getVmVersion</a>, <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#isBootClassPathSupported()" title="class or interface in java.lang.management" class="externalLink" target="_blank">isBootClassPathSupported</a></code></li>
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<h4>getCPULoad</h4>
<pre class="methodSignature">double&nbsp;getCPULoad()</pre>
<div class="block">Returns a double value which holds the system load average calculated for
the minute preceding the call, where <i>system load average</i> is taken
to mean the following:
<p>
The time-averaged value of the sum of the number of runnable entities
running on the available processors and the number of runnable entities
ready and queued to run on the available processors. The averaging
technique adopted can vary depending on the underlying operating system.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>normally, the system load average as a double. If the system load
average is not obtainable (e.g. because the calculation may
involve an unacceptable performance impact) then a negative value
is returned.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.6</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/OperatingSystemMXBean.html?is-external=true#getSystemLoadAverage()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>OperatingSystemMXBean.getSystemLoadAverage()</code></a></dd>
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<h4>getProcessID</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">@Deprecated</a>(<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true#forRemoval()" title="class or interface in java.lang" class="externalLink" target="_blank">forRemoval</a>=true,
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Deprecated.html?is-external=true#since()" title="class or interface in java.lang" class="externalLink" target="_blank">since</a>="10")
long&nbsp;getProcessID()</pre>
<div class="deprecationBlock"><span class="deprecatedLabel">Deprecated, for removal: This API element is subject to removal in a future version.</span>
<div class="deprecationComment">As of Java 10. Use
<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/RuntimeMXBean.html?is-external=true#getPid()" title="class or interface in java.lang.management" class="externalLink" target="_blank"><code>getPid()</code></a> instead.</div>
</div>
<div class="block">Returns the native process identifier that identifies the current
Java process to the operating system. The value is prone to being
recycled over a period of time, as considered suitable by the
operating system.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A long representing the process ID (pid) on the underlying
operating system.</dd>
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<h4>getVMGeneratedCPULoad</h4>
<pre class="methodSignature">double&nbsp;getVMGeneratedCPULoad()</pre>
<div class="block">Returns a system load average calculated over the minute preceding
the call averaged over the number of CPU available to Java virtual
machine process.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A double indicating the average system load per processor.
If the system load average is not available, it returns a negative
value to indicate this.</dd>
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<h4>getVMIdleState</h4>
<pre class="methodSignature"><a href="RuntimeMXBean.VMIdleStates.html" title="enum in com.ibm.lang.management">RuntimeMXBean.VMIdleStates</a>&nbsp;getVMIdleState()</pre>
<div class="block">Returns current JVM Idle state.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>JVM idle state value - i.e active / idle</dd>
</dl>
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<h4>isVMIdle</h4>
<pre class="methodSignature">boolean&nbsp;isVMIdle()</pre>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if JVM state is idle. Otherwise returns false</dd>
</dl>
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<h4>isAttachApiInitialized</h4>
<pre class="methodSignature">boolean&nbsp;isAttachApiInitialized()</pre>
<div class="block">Query the state of the Attach API. Return false if the Attach API is:
- still initializing
- disabled
- terminated by VM shutdown</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if Attach API is initialized</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.8</dd>
</dl>
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<h4>isAttachApiTerminated</h4>
<pre class="methodSignature">boolean&nbsp;isAttachApiTerminated()</pre>
<div class="block">Query the state of the Attach API. Return true if the Attach API is:
- disabled
- terminated by VM shutdown
and false if it is
- still initializing
- initialized and running</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if Attach API is terminated</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.8</dd>
</dl>
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<h4>getVmId</h4>
<pre class="methodSignature"><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a>&nbsp;getVmId()</pre>
<div class="block">This is provided for the benefit of applications which use attach API to load JVMTI agents
into their own JVMs.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Attach API Virtual Machine ID of this VM</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.8</dd>
</dl>
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