api/jdk8/jre/management/extension/openj9/lang/management/OpenJ9DiagnosticsMXBean.html - gerrit/www.eclipse.org/openj9/docs - Git at Google

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 <div class="subTitle">openj9.lang.management</div>
 <h2 title="Interface OpenJ9DiagnosticsMXBean" class="title">Interface OpenJ9DiagnosticsMXBean</h2>
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 <pre>public interface <span class="typeNameLabel">OpenJ9DiagnosticsMXBean</span>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/management/PlatformManagedObject.html?is-external=true" target="_blank" title="class or interface in java.lang.management">PlatformManagedObject</a></pre>
 <div class="block"><p>
  This interface provides APIs to dynamically trigger dump agents. APIs are also available to
  configure dump options.
  This MXBean reuses the methods in com.ibm.jvm.Dump API
  <br>
  <table border="1">
  <caption><b>Usage example for the <a href="../../../openj9/lang/management/OpenJ9DiagnosticsMXBean.html" title="interface in openj9.lang.management"><code>OpenJ9DiagnosticsMXBean</code></a></b></caption>
  <tr> <td>
  <pre>
  <code>
    ...
    try {
       mxbeanName = new ObjectName("openj9.lang.management:type=OpenJ9Diagnostics");
    } catch (MalformedObjectNameException e) {
       // Exception Handling
    }
    try {
       MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
       if (false == mbeanServer.isRegistered(mxbeanName)) {
          // OpenJ9DiagnosticsMXBean not registered
       }
       OpenJ9DiagnosticsMXBean diagBean = JMX.newMXBeanProxy(mbeanServer, mxbeanName, OpenJ9DiagnosticsMXBean.class);
    } catch (Exception e) {
       // Exception Handling
    }
  </code>
  </pre></td></tr>
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 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../openj9/lang/management/OpenJ9DiagnosticsMXBean.html#queryDumpOptions--">queryDumpOptions</a></span>()</code>
 <div class="block">Returns the current dump configuration as an array of Strings, or null if an internal error occurs.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../openj9/lang/management/OpenJ9DiagnosticsMXBean.html#resetDumpOptions--">resetDumpOptions</a></span>()</code>
 <div class="block">Reset the JVM dump options to the settings specified when the JVM was started removing any additional
  configuration done since then.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../openj9/lang/management/OpenJ9DiagnosticsMXBean.html#setDumpOptions-java.lang.String-">setDumpOptions</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;dumpOptions)</code>
 <div class="block">This function sets options for the dump subsystem.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../openj9/lang/management/OpenJ9DiagnosticsMXBean.html#triggerClassicHeapDump--">triggerClassicHeapDump</a></span>()</code>
 <div class="block">This function triggers the heap dump agent and requests for a heap dump in CLASSIC format.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../openj9/lang/management/OpenJ9DiagnosticsMXBean.html#triggerDump-java.lang.String-">triggerDump</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;dumpAgent)</code>
 <div class="block">This function triggers the specified dump agent.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../openj9/lang/management/OpenJ9DiagnosticsMXBean.html#triggerDumpToFile-java.lang.String-java.lang.String-">triggerDumpToFile</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;dumpAgent,
                  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;fileNamePattern)</code>
 <div class="block">This function triggers the specified dump agent.</div>
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 <pre>void&nbsp;resetDumpOptions()
                throws <a href="../../../openj9/lang/management/ConfigurationUnavailableException.html" title="class in openj9.lang.management">ConfigurationUnavailableException</a></pre>
 <div class="block">Reset the JVM dump options to the settings specified when the JVM was started removing any additional
  configuration done since then. This method may throw a ConfigurationUnavailableException if the dump
  configuration cannot be altered. If this occurs it will usually be because a dump event is currently being
  handled.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../openj9/lang/management/ConfigurationUnavailableException.html" title="class in openj9.lang.management">ConfigurationUnavailableException</a></code> - if the configuration cannot be changed because a dump is already in progress</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/SecurityException.html?is-external=true" target="_blank" title="class or interface in java.lang">SecurityException</a></code> - if there is a security manager and it doesn't allow the checks required to change the dump settings</dd>
 </dl>
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 <h4>queryDumpOptions</h4>
 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>[]&nbsp;queryDumpOptions()</pre>
 <div class="block">Returns the current dump configuration as an array of Strings, or null if an internal error occurs.
  The syntax of the option Strings is the same as the -Xdump command-line option,
  with the initial -Xdump: omitted. See the -Xdump option section on dump agents in
  the documentation for the OpenJ9 JVM.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/SecurityException.html?is-external=true" target="_blank" title="class or interface in java.lang">SecurityException</a></code> - if there is a security manager and it doesn't allow the checks required to read the dump settings</dd>
 </dl>
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 <h4>setDumpOptions</h4>
 <pre>void&nbsp;setDumpOptions(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;dumpOptions)
              throws <a href="../../../openj9/lang/management/InvalidOptionException.html" title="class in openj9.lang.management">InvalidOptionException</a>,
                     <a href="../../../openj9/lang/management/ConfigurationUnavailableException.html" title="class in openj9.lang.management">ConfigurationUnavailableException</a></pre>
 <div class="block">This function sets options for the dump subsystem.
  The dump option is passed in as a String. Use the same syntax as the -Xdump command-line option, with the
  initial -Xdump: omitted. See the -Xdump option section on dump agents in the
  documentation for the OpenJ9 JVM. This method may throw a ConfigurationUnavailableException if the dump
  configuration cannot be altered.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>dumpOptions</code> - the options string to be set</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../openj9/lang/management/InvalidOptionException.html" title="class in openj9.lang.management">InvalidOptionException</a></code> - if the specified dumpOptions cannot be set or is incorrect</dd>
 <dd><code><a href="../../../openj9/lang/management/ConfigurationUnavailableException.html" title="class in openj9.lang.management">ConfigurationUnavailableException</a></code> - if the configuration cannot be changed because a dump is already in progress</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/SecurityException.html?is-external=true" target="_blank" title="class or interface in java.lang">SecurityException</a></code> - if there is a security manager and it doesn't allow the checks required to change the dump settings</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" target="_blank" title="class or interface in java.lang">NullPointerException</a></code> - if dumpOptions is null</dd>
 </dl>
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 <h4>triggerDump</h4>
 <pre>void&nbsp;triggerDump(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;dumpAgent)
           throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" target="_blank" title="class or interface in java.lang">IllegalArgumentException</a></pre>
 <div class="block">This function triggers the specified dump agent. Dump agents supported - java, snap, system and heap.
  A java dump is in a human-readable format, and summarizes the state of the JVM.
  The default heap dump format (a phd file) is not human-readable.
  A system dump is a platform-specific file that contains information about the active processes, threads, and
  system memory. System dumps are usually large.
  The snap dump format is not human-readable and must be processed using the trace formatting tool supplied  with the OpenJ9 JVM.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>dumpAgent</code> - the dump agent to be triggered</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" target="_blank" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the specified dump agent is invalid or unsupported by this method</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" target="_blank" title="class or interface in java.lang">RuntimeException</a></code> - if the vm does not contain RAS dump support</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/SecurityException.html?is-external=true" target="_blank" title="class or interface in java.lang">SecurityException</a></code> - if there is a security manager and it doesn't allow the checks required to trigger this dump</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" target="_blank" title="class or interface in java.lang">NullPointerException</a></code> - if dumpAgent is null</dd>
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 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;triggerDumpToFile(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;dumpAgent,
                          <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;fileNamePattern)
                   throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" target="_blank" title="class or interface in java.lang">IllegalArgumentException</a>,
                          <a href="../../../openj9/lang/management/InvalidOptionException.html" title="class in openj9.lang.management">InvalidOptionException</a></pre>
 <div class="block">This function triggers the specified dump agent. Dump agents supported - java, snap, system and heap.
  The JVM will attempt to write the file to the specified file name. This may
  include replacement tokens as documented in the section on dump agents
  in the documentation for the OpenJ9 JVM.

  A string containing the actual filename written to is returned. This may not
  be the same as the requested filename for several reasons:
  <ul>
  <li>null or the empty string was specified, this will cause the JVM to write the
   dump to the default location based on the current dump settings and return that
   path.</li>
  <li>Replacement (%) tokens were specified in the file name. These will have been
   expanded.</li>
  <li>The full path is returned, if only a filename with no directory was specified
   the full path with the directory the dump was written to will be returned.</li>
  <li>The JVM couldn't write to the specified location. In this case it will attempt
   to write the dump to another location, unless -Xdump:nofailover was specified on
   the command line.</li>
  </ul>

  If a security manager exists a permission check for com.ibm.jvm.DumpPermission will be
  made, if this fails a SecurityException will be thrown.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>dumpAgent</code> - the dump agent to be triggered</dd>
 <dd><code>fileNamePattern</code> - the filename to write to, which may be null, empty or include replacement tokens</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the file name that the dump was actually written to</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../openj9/lang/management/InvalidOptionException.html" title="class in openj9.lang.management">InvalidOptionException</a></code> - if the fileNamePattern was invalid</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" target="_blank" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the specified dump agent is invalid or unsupported by this method</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/SecurityException.html?is-external=true" target="_blank" title="class or interface in java.lang">SecurityException</a></code> - if there is a security manager and it doesn't allow the checks required to trigger this dump</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" target="_blank" title="class or interface in java.lang">NullPointerException</a></code> - if dumpAgent is null</dd>
 </dl>
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 <h4>triggerClassicHeapDump</h4>
 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" target="_blank" title="class or interface in java.lang">String</a>&nbsp;triggerClassicHeapDump()
                        throws <a href="../../../openj9/lang/management/InvalidOptionException.html" title="class in openj9.lang.management">InvalidOptionException</a></pre>
 <div class="block">This function triggers the heap dump agent and requests for a heap dump in CLASSIC format.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The file name of the dump that was created</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../openj9/lang/management/InvalidOptionException.html" title="class in openj9.lang.management">InvalidOptionException</a></code> - if the dump operation fails</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/RuntimeException.html?is-external=true" target="_blank" title="class or interface in java.lang">RuntimeException</a></code> - if the JVM does not contain RAS dump support</dd>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/SecurityException.html?is-external=true" target="_blank" title="class or interface in java.lang">SecurityException</a></code> - if there is a security manager and it doesn't allow the checks required to trigger this dump</dd>
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