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<a href="../djdknativecrypto/" title="-Djdk.nativeCrypto" class="md-nav__link">
-Djdk.nativeCrypto
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<a href="../djdknativedigest/" title="-Djdk.nativeDigest" class="md-nav__link">
-Djdk.nativeDigest
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<a href="../djdknativegcm/" title="-Djdk.nativeGCM" class="md-nav__link">
-Djdk.nativeGCM
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<a href="../djdknativersa/" title="-Djdk.nativeRSA" class="md-nav__link">
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-Xaggressive
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<a href="../xalwaysclassgc/" title="-Xalwaysclassgc" class="md-nav__link">
-Xalwaysclassgc
</a>
</li>
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<a href="../xaot/" title="-Xaot" class="md-nav__link">
-Xaot
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</li>
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-Xargencoding
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-Xbootclasspath
</a>
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-XCEEHDLR
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<a href="../xcheck/" title="-Xcheck" class="md-nav__link">
-Xcheck
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</li>
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<a href="../xclassgc/" title="-Xclassgc" class="md-nav__link">
-Xclassgc
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-Xcodecache
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</li>
<li class="md-nav__item">
<a href="../xcodecachetotal/" title="-Xcodecachetotal" class="md-nav__link">
-Xcodecachetotal
</a>
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<a href="../xcomp/" title="-Xcomp" class="md-nav__link">
-Xcomp
</a>
</li>
<li class="md-nav__item">
<a href="../xcompactexplicitgc/" title="-Xcompactexplicitgc" class="md-nav__link">
-Xcompactexplicitgc
</a>
</li>
<li class="md-nav__item">
<a href="../xcompactgc/" title="-Xcompactgc" class="md-nav__link">
-Xcompactgc
</a>
</li>
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-XcompilationThreads
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<a href="../xcompressedrefs/" title="-Xcompressedrefs" class="md-nav__link">
-Xcompressedrefs
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<a href="../xconcurrentbackground/" title="-Xconcurrentbackground" class="md-nav__link">
-Xconcurrentbackground
</a>
</li>
<li class="md-nav__item">
<a href="../xconcurrentlevel/" title="-Xconcurrentlevel" class="md-nav__link">
-Xconcurrentlevel
</a>
</li>
<li class="md-nav__item">
<a href="../xconcurrentslack/" title="-Xconcurrentslack" class="md-nav__link">
-Xconcurrentslack
</a>
</li>
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<a href="../xconmeter/" title="-Xconmeter" class="md-nav__link">
-Xconmeter
</a>
</li>
<li class="md-nav__item">
<a href="../xenableexcessivegc/" title="-Xdisableexcessivegc" class="md-nav__link">
-Xdisableexcessivegc
</a>
</li>
<li class="md-nav__item">
<a href="../xenableexplicitgc/" title="-Xdisableexplicitgc" class="md-nav__link">
-Xdisableexplicitgc
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</li>
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<a href="../xdisablejavadump/" title="-Xdisablejavadump" class="md-nav__link">
-Xdisablejavadump
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</li>
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<a href="../xenablestringconstantgc/" title="-Xdisablestringconstantgc" class="md-nav__link">
-Xdisablestringconstantgc
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</li>
<li class="md-nav__item">
<a href="../xdump/" title="-Xdump" class="md-nav__link">
-Xdump
</a>
</li>
<li class="md-nav__item">
<a href="../xenableexcessivegc/" title="-Xenableexcessivegc" class="md-nav__link">
-Xenableexcessivegc
</a>
</li>
<li class="md-nav__item">
<a href="../xenableexplicitgc/" title="-Xenableexplicitgc" class="md-nav__link">
-Xenableexplicitgc
</a>
</li>
<li class="md-nav__item">
<a href="../xenablestringconstantgc/" title="-Xenablestringconstantgc" class="md-nav__link">
-Xenablestringconstantgc
</a>
</li>
<li class="md-nav__item">
<a href="../xfastresolve/" title="-Xfastresolve" class="md-nav__link">
-Xfastresolve
</a>
</li>
<li class="md-nav__item">
<a href="../xfuture/" title="-Xfuture" class="md-nav__link">
-Xfuture
</a>
</li>
<li class="md-nav__item">
<a href="../xgc/" title="-Xgc" class="md-nav__link">
-Xgc
</a>
</li>
<li class="md-nav__item">
<a href="../xgcsplitheap/" title="-Xgc:splitheap" class="md-nav__link">
-Xgc:splitheap
</a>
</li>
<li class="md-nav__item">
<a href="../xgcpolicy/" title="-Xgcpolicy" class="md-nav__link">
-Xgcpolicy
</a>
</li>
<li class="md-nav__item">
<a href="../xgcthreads/" title="-Xgcthreads" class="md-nav__link">
-Xgcthreads
</a>
</li>
<li class="md-nav__item">
<a href="../xgcworkpackets/" title="-Xgcworkpackets" class="md-nav__link">
-Xgcworkpackets
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<a href="../xint/" title="-Xint" class="md-nav__link">
-Xint
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</li>
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<a href="../xss/" title="-Xiss" class="md-nav__link">
-Xiss
</a>
</li>
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<a href="../xjit/" title="-Xjit" class="md-nav__link">
-Xjit
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</li>
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<a href="../xjni/" title="-Xjni" class="md-nav__link">
-Xjni
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</li>
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-Xlinenumbers
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<li class="md-nav__item">
<a href="../xloa/" title="-Xloa" class="md-nav__link">
-Xloa
</a>
</li>
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<a href="../xloaminimum/" title="-Xloainitial" class="md-nav__link">
-Xloainitial
</a>
</li>
<li class="md-nav__item">
<a href="../xloaminimum/" title="-Xloamaximum" class="md-nav__link">
-Xloamaximum
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</li>
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<a href="../xloaminimum/" title="-Xloaminimum" class="md-nav__link">
-Xloaminimum
</a>
</li>
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<a href="../xlockreservation/" title="-XlockReservation" class="md-nav__link">
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</li>
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<a href="../xlockword/" title="-Xlockword" class="md-nav__link">
-Xlockword
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</li>
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<a href="../xlog/" title="-Xlog" class="md-nav__link">
-Xlog
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</li>
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<a href="../xlp/" title="-Xlp" class="md-nav__link">
-Xlp
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<a href="../xlpcodecache/" title="-Xlp:codecache" class="md-nav__link">
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<a href="../xmine/" title="-Xmaxe" class="md-nav__link">
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<a href="../xmca/" title="-Xmco" class="md-nav__link">
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<a href="../xmcrs/" title="-Xmcrs" class="md-nav__link">
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<a href="../xmine/" title="-Xmine" class="md-nav__link">
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</li>
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<a href="../xminf/" title="-Xminf" class="md-nav__link">
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<a href="../xmint/" title="-Xmint" class="md-nav__link">
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</li>
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<a href="../xmn/" title="-Xmn" class="md-nav__link">
-Xmn
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</li>
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<a href="../xmn/" title="-Xmns" class="md-nav__link">
-Xmns
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</li>
<li class="md-nav__item">
<a href="../xmn/" title="-Xmnx" class="md-nav__link">
-Xmnx
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</li>
<li class="md-nav__item">
<a href="../xmo/" title="-Xmo" class="md-nav__link">
-Xmo
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<a href="../xmo/" title="-Xmoi" class="md-nav__link">
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<a href="../xmo/" title="-Xmos" class="md-nav__link">
-Xmos
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</li>
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<a href="../xmo/" title="-Xmox" class="md-nav__link">
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</li>
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<a href="../xmr/" title="-Xmr" class="md-nav__link">
-Xmr
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<a href="../xmr/" title="-Xmrx" class="md-nav__link">
-Xmrx
</a>
</li>
<li class="md-nav__item">
<a href="../xms/" title="-Xms" class="md-nav__link">
-Xms
</a>
</li>
<li class="md-nav__item">
<a href="../xmso/" title="-Xmso" class="md-nav__link">
-Xmso
</a>
</li>
<li class="md-nav__item">
<a href="../xms/" title="-Xmx" class="md-nav__link">
-Xmx
</a>
</li>
<li class="md-nav__item">
<a href="../xaot/" title="-Xnoaot" class="md-nav__link">
-Xnoaot
</a>
</li>
<li class="md-nav__item">
<a href="../xclassgc/" title="-Xnoclassgc" class="md-nav__link">
-Xnoclassgc
</a>
</li>
<li class="md-nav__item">
<a href="../xcompactexplicitgc/" title="-Xnocompactexplicitgc" class="md-nav__link">
-Xnocompactexplicitgc
</a>
</li>
<li class="md-nav__item">
<a href="../xcompactgc/" title="-Xnocompactgc" class="md-nav__link">
-Xnocompactgc
</a>
</li>
<li class="md-nav__item">
<a href="../xcompressedrefs/" title="-Xnocompressedrefs" class="md-nav__link">
-Xnocompressedrefs
</a>
</li>
<li class="md-nav__item">
<a href="../xjit/" title="-Xnojit" class="md-nav__link">
-Xnojit
</a>
</li>
<li class="md-nav__item">
<a href="../xlinenumbers/" title="-Xnolinenumbers" class="md-nav__link">
-Xnolinenumbers
</a>
</li>
<li class="md-nav__item">
<a href="../xloa/" title="-Xnoloa" class="md-nav__link">
-Xnoloa
</a>
</li>
<li class="md-nav__item">
<a href="../xsigcatch/" title="-Xnosigcatch" class="md-nav__link">
-Xnosigcatch
</a>
</li>
<li class="md-nav__item">
<a href="../xsigchain/" title="-Xnosigchain" class="md-nav__link">
-Xnosigchain
</a>
</li>
<li class="md-nav__item">
<a href="../xnumanone/" title="-Xnuma:none" class="md-nav__link">
-Xnuma:none
</a>
</li>
<li class="md-nav__item">
<a href="../xoptionsfile/" title="-Xoptionsfile" class="md-nav__link">
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</a>
</li>
<li class="md-nav__item">
<a href="../xquickstart/" title="-Xquickstart" class="md-nav__link">
-Xquickstart
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</li>
<li class="md-nav__item">
<a href="../xrs/" title="-Xrs" class="md-nav__link">
-Xrs
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</li>
<li class="md-nav__item">
<a href="../xsamplingexpirationtime/" title="-XsamplingExpirationTime" class="md-nav__link">
-XsamplingExpirationTime
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</li>
<li class="md-nav__item">
<a href="../xscdmx/" title="-Xscdmx" class="md-nav__link">
-Xscdmx
</a>
</li>
<li class="md-nav__item">
<a href="../xscminaot/" title="-Xscmaxaot" class="md-nav__link">
-Xscmaxaot
</a>
</li>
<li class="md-nav__item">
<a href="../xscminjitdata/" title="-Xscmaxjitdata" class="md-nav__link">
-Xscmaxjitdata
</a>
</li>
<li class="md-nav__item">
<a href="../xscminaot/" title="-Xscminaot" class="md-nav__link">
-Xscminaot
</a>
</li>
<li class="md-nav__item">
<a href="../xscminjitdata/" title="-Xscminjitdata" class="md-nav__link">
-Xscminjitdata
</a>
</li>
<li class="md-nav__item">
<a href="../xscmx/" title="-Xscmx" class="md-nav__link">
-Xscmx
</a>
</li>
<li class="md-nav__item">
<a href="../xshareclasses/" title="-Xshareclasses" class="md-nav__link">
-Xshareclasses
</a>
</li>
<li class="md-nav__item">
<a href="../xsigcatch/" title="-Xsigcatch" class="md-nav__link">
-Xsigcatch
</a>
</li>
<li class="md-nav__item">
<a href="../xsigchain/" title="-Xsigchain" class="md-nav__link">
-Xsigchain
</a>
</li>
<li class="md-nav__item">
<a href="../xsignal/" title="-Xsignal" class="md-nav__link">
-Xsignal
</a>
</li>
<li class="md-nav__item">
<a href="../xsoftmx/" title="-Xsoftmx" class="md-nav__link">
-Xsoftmx
</a>
</li>
<li class="md-nav__item">
<a href="../xsoftrefthreshold/" title="-Xsoftrefthreshold" class="md-nav__link">
-Xsoftrefthreshold
</a>
</li>
<li class="md-nav__item">
<a href="../xss/" title="-Xss" class="md-nav__link">
-Xss
</a>
</li>
<li class="md-nav__item">
<a href="../xss/" title="-Xssi" class="md-nav__link">
-Xssi
</a>
</li>
<li class="md-nav__item">
<a href="../xsyslog/" title="-Xsyslog" class="md-nav__link">
-Xsyslog
</a>
</li>
<li class="md-nav__item">
<a href="../xtgc/" title="-Xtgc" class="md-nav__link">
-Xtgc
</a>
</li>
<li class="md-nav__item">
<a href="../xthr/" title="-Xthr" class="md-nav__link">
-Xthr
</a>
</li>
<li class="md-nav__item">
<a href="../xtlhprefetch/" title="-XtlhPrefetch" class="md-nav__link">
-XtlhPrefetch
</a>
</li>
<li class="md-nav__item">
<a href="../xtrace/" title="-Xtrace" class="md-nav__link">
-Xtrace
</a>
</li>
<li class="md-nav__item">
<a href="../xtunevirtualized/" title="-Xtune:virtualized" class="md-nav__link">
-Xtune:virtualized
</a>
</li>
<li class="md-nav__item">
<a href="../xverbosegclog/" title="-Xverbosegclog" class="md-nav__link">
-Xverbosegclog
</a>
</li>
<li class="md-nav__item">
<a href="../xverify/" title="-Xverify" class="md-nav__link">
-Xverify
</a>
</li>
<li class="md-nav__item">
<a href="../xzero/" title="-Xzero" class="md-nav__link">
-Xzero
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</li>
</ul>
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<h1 id="-dcomibmtoolsattachenable">-Dcom.ibm.tools.attach.enable</h1>
<p>Enable the Attach API for this application.</p>
<h2 id="syntax">Syntax</h2>
<pre><code> -Dcom.ibm.tools.attach.enable=[yes|no]
</code></pre>
<p>On AIX&reg;, Linux&reg;, macOS&reg;, and Windows&trade; systems, the following default applies:</p>
<table>
<thead>
<tr>
<th>Value</th>
<th>Effect</th>
<th align="center">Default</th>
</tr>
</thead>
<tbody>
<tr>
<td>yes</td>
<td>Enable</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
<tr>
<td>no</td>
<td>Disable</td>
<td align="center"></td>
</tr>
</tbody>
</table>
<p>On z/OS&reg; systems, the following default applies:</p>
<table>
<thead>
<tr>
<th>Value</th>
<th>Effect</th>
<th align="center">Default</th>
</tr>
</thead>
<tbody>
<tr>
<td>yes</td>
<td>Enable</td>
<td align="center"></td>
</tr>
<tr>
<td>no</td>
<td>Disable</td>
<td align="center"><i class="fa fa-check" aria-hidden="true"></i><span class="sr-only">yes</span></td>
</tr>
</tbody>
</table>
<h2 id="explanation">Explanation</h2>
<p>A useful reference for information about the Java&trade; Attach API can be found at <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/attach/index.html">http://docs.oracle.com/javase/8/docs/technotes/guides/attach/index.html</a>. The following extract is taken from the Oracle documentation:</p>
<blockquote>
<p>The Attach API is an extension that provides a mechanism to attach to a Java virtual machine. A tool written in the Java Language, uses this API to attach to a target virtual machine and load its tool agent into that virtual machine.</p>
</blockquote>
<p>A usage example is to late attach the IBM&reg; Health Center agent to a virtual machine (VM) that is already running.</p>
<p>The OpenJ9 implementation of the Attach API is equivalent to the Oracle implementation. However, the OpenJ9 implementation cannot be used to attach to, or accept attach requests from, other VM implementations.</p>
<h2 id="see-also">See also</h2>
<ul>
<li><a href="../attachapi/">Java&trade; Attach API</a></li>
<li><a href="../dcomibmtoolsattachcommand_timeout/">-Dcom.ibm.tools.attach.command_timeout</a></li>
<li><a href="../dcomibmtoolsattachdirectory/">-Dcom.ibm.tools.attach.directory</a></li>
<li><a href="../dcomibmtoolsattachdisplayname/">-Dcom.ibm.tools.attach.displayName</a></li>
<li><a href="../dcomibmtoolsattachid/">-Dcom.ibm.tools.attach.id</a></li>
<li><a href="../dcomibmtoolsattachlogging/">-Dcom.ibm.tools.attach.logging</a></li>
<li><a href="../dcomibmtoolsattachlogname/">-Dcom.ibm.tools.attach.log.name</a></li>
<li><a href="../dcomibmtoolsattachshutdown_timeout/">-Dcom.ibm.tools.attach.shutdown_timeout</a></li>
<li><a href="../dcomibmtoolsattachtimeout/">-Dcom.ibm.tools.attach.timeout</a></li>
</ul>
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