blocks|key|1666054|text|假设您知道pid，您可以使用jmap获取任何正在运行的进程的转储。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1666055|使用任务管理器或资源监视器获取pid。然后|1666056|jmap+-dump:format=b,file=cheap.hprof+<pid>|code-block|syntax|javascript|1666057|来获取该进程的堆。|1666058|entityMap^0|5|3|E|4|0|F|3|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

You can use <code>jmap</code> to get a dump of any process running, assuming you know the <code>pid</code>.

Use Task Manager or Resource Monitor to get the <code>pid</code>. Then

<pre><code>jmap -dump:format=b,file=cheap.hprof &lt;pid&gt;
</code></pre>

to get the heap for that process.

blocks|key|5195098|text|我认为在Linux进程中创建.hprof文件的最好方法是使用jmap命令。例如：jmap+-dump:format=b,file=filename.hprof+{PID}|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|5195099|entityMap^0|U|4|14|19|0^^$0|@$1|2|3|4|5|6|7|I|8|@$9|J|A|K|B|C]|$9|L|A|M|B|D]]|E|@]|F|$]]|$1|G|3|-4|5|6|7|N|8|@]|E|@]|F|$]]]|H|$]]

I think the best way to create .hprof file in Linux process is with jmap command. For example: <code>jmap -dump:format=b,file=filename.hprof {PID}</code>

blocks|key|1666049|text|除了使用前面提到的jconsole/visualvm之外，您还可以在另一个命令行窗口上使用jstack+-l+<vm-id>，并捕获该输出。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1666050|可以使用任务管理器(它是windows和unix上的进程id+)或使用jps找到。|1666051|Sun+JDK版本6和更高版本中都包含jstack和jps。|1666052|entityMap^0|19|H|0|Z|3|0|J|6|Q|3|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|K|$]]

In addition to using the mentioned jconsole/visualvm, you can use <code>jstack -l &lt;vm-id&gt;</code> on another command line window, and capture that output.

The &lt;vm-id&gt; can be found using the task manager (it is the process id on windows and unix), or using <code>jps</code>.

Both <code>jstack</code> and <code>jps</code> are include in the Sun JDK version 6 and higher.

blocks|key|5195008|text|我推荐与VisualVM一起发布的Java+(jvisualvm.exe)。它可以动态连接并访问线程和堆。我发现在一些问题上是无价的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5195009|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I recommend the Java VisualVM distributed with the JDK (jvisualvm.exe). It can connect dynamically and access the threads and heap. I have found in invaluable for some problems.

blocks|key|3777371|text|如果您使用的是server-jre+8或更高版本，则可以使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3777372|jcmd+PID+GC.heap_dump+/tmp/dump|code-block|syntax|javascript|3777373|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you are on server-jre 8 and above you can use this:

<pre><code>jcmd PID GC.heap_dump /tmp/dump
</code></pre>

blocks|key|1456679|text|请尝试以下选项之一。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1456680|32位JVM的|1456681|：|ordered-list-item|1456682|1456683|用于64位JVM的file=+|1456684|的jmap+-dump:format=b+(明确引用)：|unordered-list-item|1456685|1456686|jmap+-J-d64+-dump:format=b，适用于64位JVM的file=+|1456687|，在虚拟机参数中使用G1GC算法(仅使用G1GC算法生成活动对象堆)：|1456688|1456689|jmap+-J-d64+-dump:live，format=b，file=+|1456690|相关SE问题：Java+heap+dump+error+with+jmap+command+:+Premature+EOF|offset|length|1456691|在此article上查看jmap的各种选项|style|CODE|1456692|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/36604102/java-heap-dump-error-with-jmap-command-premature-eof/|1|http://docs.oracle.com/javase/7/docs/technotes/tools/share/jmap.html^0|0|0|0|0|0|0|0|0|0|0|0|7|1I|0|0|C|4|2|7|1|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1E|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1G|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1H|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1J|8|@]|9|@]|A|$]]|$1|P|3|Q|5|L|7|1K|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1M|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1N|8|@]|9|@$W|1O|X|1P|1|1Q]]|A|$]]|$1|Y|3|Z|5|6|7|1R|8|@$W|1S|X|1T|10|11]]|9|@$W|1U|X|1V|1|1W]]|A|$]]|$1|12|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]|1A|$5|15|16|17|A|$18|1B]]]]

Try one of below options.

<ol>
<li>For 32 bit JVM:

<pre><code>jmap -dump:format=b,file=&lt;heap_dump_filename&gt; &lt;pid&gt;
</code></pre></li>
<li>For 64 bit JVM (explicitly quoting):

<pre><code>jmap -J-d64 -dump:format=b,file=&lt;heap_dump_filename&gt; &lt;pid&gt;
</code></pre></li>
<li>For 64 bit JVM with G1GC algorithm in VM parameters (Only live objects heap is generated with G1GC algorithm): 

<pre><code>jmap -J-d64 -dump:live,format=b,file=&lt;heap_dump_filename&gt; &lt;pid&gt;
</code></pre></li>
</ol>

Related SE question: <a href="https://stackoverflow.com/questions/36604102/java-heap-dump-error-with-jmap-command-premature-eof/">Java heap dump error with jmap command : Premature EOF</a> 

Have a look at various options of <code>jmap</code> at this <a href="http://docs.oracle.com/javase/7/docs/technotes/tools/share/jmap.html" rel="noreferrer">article</a>

blocks|key|3777335|text|如果您想在内存不足时使用堆转储，可以使用选项-XX:-HeapDumpOnOutOfMemoryError启动Java|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3777336|c.f.JVM+Options+reference+page|3777337|entityMap|0|LINK|mutability|MUTABLE|url|http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html^0|M|V|0|4|Q|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

If you want a heapdump on out-of-memory, you can start Java with the option <code>-XX:-HeapDumpOnOutOfMemoryError</code> 

c.f. <a href="http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html" rel="noreferrer">JVM Options reference page</a>

blocks|key|3777244|text|你可以从Cygwin发送kill+-3+<pid>。您必须使用Cygwin+ps选项来查找windows进程，然后将信号发送到该进程。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3777245|entityMap^0|C|D|12|2|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

You can send the <code>kill -3 &lt;pid&gt;</code> from Cygwin. You have to use the Cygwin <code>ps</code> options to find windows processes then just send the signal to that process.

blocks|key|3777269|text|您可以运行jconsole+(包含在Java6SDK中)，然后连接到您的Java应用程序。它将显示每个运行的线程及其堆栈跟踪。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3777270|entityMap^0|5|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

You could run <code>jconsole</code> (included with Java 6's SDK) then connect to your Java application. It will show you every Thread running and its stack trace.

blocks|key|1452236|text|您必须将输出从第二个java可执行文件重定向到某个文件。然后，使用SendSignal+send+"-3"到您的第二个进程。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1452237|entityMap|0|LINK|mutability|MUTABLE|url|http://www.viewtier.com/support/technical_notes/SendSignal.exe|1|https://stackoverflow.com/questions/813086/can-i-send-a-ctrl-c-sigint-to-an-application-on-windows^0|X|A|0|18|9|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

You have to redirect output from second java executable to some file.
Then, use <a href="http://www.viewtier.com/support/technical_notes/SendSignal.exe" rel="nofollow noreferrer">SendSignal</a> to <a href="https://stackoverflow.com/questions/813086/can-i-send-a-ctrl-c-sigint-to-an-application-on-windows">send "-3"</a> to your second process.

blocks|key|1456700|text|下面的脚本使用PsExec连接到另一个Windows会话，因此即使通过远程桌面服务连接，它也可以正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1456701|我为Java8(使用PsExec和jcmd)编写了一个名为jvmdump.bat的小批处理脚本，它转储线程、堆、系统属性和JVM。|offset|length|style|CODE|1456702|::+set+the+paths+for+your+environment
set+PsExec=C:\Apps\SysInternals\PsExec.exe
set+JAVA_HOME=C:\Apps\Java\jdk1.8.0_121
set+DUMP_DIR=C:\temp

@echo+off

set+PID=%251

if+"%25PID%25"==""+(
++++echo+usage:+jvmdump.bat+{pid}
++++exit+/b
)

for+/f+"tokens=2,3,4+delims=/+"+%25%25f+in+('date+/t')+do+set+timestamp_d=%25%25h%25%25g%25%25f
for+/f+"tokens=1,2+delims=:+"+%25%25f+in+('time+/t')+do+set+timestamp_t=%25%25f%25%25g
set+timestamp=%25timestamp_d%25%25timestamp_t%25
echo+datetime+is:+%25timestamp%25

echo+###+Version+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
%25PsExec%25+-s+%25JAVA_HOME%25\bin\jcmd.exe+%25PID%25+VM.version+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"

echo.+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
echo+###+Uptime+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
%25PsExec%25+-s+%25JAVA_HOME%25\bin\jcmd.exe+%25PID%25+VM.uptime+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"

echo.+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
echo+###+Command+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
%25PsExec%25+-s+%25JAVA_HOME%25\bin\jcmd.exe+%25PID%25+VM.command_line+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"

echo.+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
echo+###+Flags+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
%25PsExec%25+-s+%25JAVA_HOME%25\bin\jcmd.exe+%25PID%25+VM.flags+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"

echo.+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
echo+###+Properties+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"
%25PsExec%25+-s+%25JAVA_HOME%25\bin\jcmd.exe+%25PID%25+VM.system_properties+>>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-jvm.log"

%25PsExec%25+-s+%25JAVA_HOME%25\bin\jcmd.exe+%25PID%25+Thread.print+-l+>"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-threads.log"

%25PsExec%25+-s+%25JAVA_HOME%25\bin\jcmd.exe+%25PID%25+GC.heap_dump+"%25DUMP_DIR%25\%25PID%25-%25timestamp%25-heap.hprof"

echo+Dumped+to+%25DUMP_DIR%25|code-block|syntax|javascript|1456703|它必须在启动JVM的用户的同一个Windows会话中运行，所以如果您通过远程桌面连接，您可能需要在Session+0中启动命令提示符并从那里运行它。例如：|1456704|%25PsExec%25+-s+-h+-d+-i+0+cmd.exe|1456705|这将提示您(单击底部的任务栏图标)进入交互式会话中的View+the+message，这将把您带到另一个会话中的新控制台，您可以在其中运行jvmdump.bat脚本。|1456706|entityMap|0|LINK|mutability|MUTABLE|url|https://technet.microsoft.com/en-us/sysinternals/bb897553.aspx|1|https://gist.github.com/isapir/e2bf7595b926a94d54516f395f89e1c8^0|0|A|6|H|4|T|B|A|6|0|T|B|1|0|0|1D|9|0|0|Q|G|1X|B|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@$D|14|E|15|F|G]|$D|16|E|17|F|G]|$D|18|E|19|F|G]]|9|@$D|1A|E|1B|1|1C]|$D|1D|E|1E|1|1F]]|A|$]]|$1|H|3|I|5|J|7|1G|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1H|8|@$D|1I|E|1J|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|1K|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1L|8|@$D|1M|E|1N|F|G]|$D|1O|E|1P|F|G]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

The following script uses PsExec to connect to another Windows Session so it works even when connected via Remote Desktop Service.

I wrote a small batch script for Java 8 (using <a href="https://technet.microsoft.com/en-us/sysinternals/bb897553.aspx" rel="nofollow noreferrer"><code>PsExec</code></a> and <code>jcmd</code>) named <a href="https://gist.github.com/isapir/e2bf7595b926a94d54516f395f89e1c8" rel="nofollow noreferrer"><code>jvmdump.bat</code></a>, which dumps the threads, heap, system properties, and JVM args.

<pre><code>:: set the paths for your environment
set PsExec=C:\Apps\SysInternals\PsExec.exe
set JAVA_HOME=C:\Apps\Java\jdk1.8.0_121
set DUMP_DIR=C:\temp

@echo off

set PID=%1

if "%PID%"=="" (
 echo usage: jvmdump.bat {pid}
 exit /b
)

for /f "tokens=2,3,4 delims=/ " %%f in ('date /t') do set timestamp_d=%%h%%g%%f
for /f "tokens=1,2 delims=: " %%f in ('time /t') do set timestamp_t=%%f%%g
set timestamp=%timestamp_d%%timestamp_t%
echo datetime is: %timestamp%

echo ### Version &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
%PsExec% -s %JAVA_HOME%\bin\jcmd.exe %PID% VM.version &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"

echo. &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
echo ### Uptime &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
%PsExec% -s %JAVA_HOME%\bin\jcmd.exe %PID% VM.uptime &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"

echo. &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
echo ### Command &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
%PsExec% -s %JAVA_HOME%\bin\jcmd.exe %PID% VM.command_line &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"

echo. &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
echo ### Flags &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
%PsExec% -s %JAVA_HOME%\bin\jcmd.exe %PID% VM.flags &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"

echo. &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
echo ### Properties &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"
%PsExec% -s %JAVA_HOME%\bin\jcmd.exe %PID% VM.system_properties &gt;&gt;"%DUMP_DIR%\%PID%-%timestamp%-jvm.log"

%PsExec% -s %JAVA_HOME%\bin\jcmd.exe %PID% Thread.print -l &gt;"%DUMP_DIR%\%PID%-%timestamp%-threads.log"

%PsExec% -s %JAVA_HOME%\bin\jcmd.exe %PID% GC.heap_dump "%DUMP_DIR%\%PID%-%timestamp%-heap.hprof"

echo Dumped to %DUMP_DIR%
</code></pre>

It must be run in the same Windows session of the user that started the JVM, so if you connect through Remote Desktop you might need to launch a command prompt in <code>Session 0</code> and run it from there. e.g.

<pre><code>%PsExec% -s -h -d -i 0 cmd.exe
</code></pre>

This will prompt you (click the taskbar icon at the bottom) to <code>View the message</code> in the interactive session, which will take you to the new console in the other session from which you can run the <code>jvmdump.bat</code> script.

blocks|key|1452474|text|如何获取java应用程序的进程id？|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1452475|执行命令'jcmd‘以获取java应用程序的进程id。|1452476|如何获取线程转储？|1452477|thread.dump+PID+Thread.print+>+jcmd|1452478|参考link|1452479|您甚至可以使用jstack来获取线程转储(jstack+PID+>+thread.dump)。参考link|1452480|如何获取堆转储？|1452481|使用jmap工具获取堆转储。jmap+-F+-dump:live，format=b，file=heap.bin+PID|1452482|PID代表应用程序的进程id。参考link|1452483|entityMap|0|LINK|mutability|MUTABLE|url|https://self-learning-java-tutorial.blogspot.com/2018/08/jcmd-threadprint-get-thread-dumps.html|1|https://self-learning-java-tutorial.blogspot.com/2018/08/jstack-get-thread-dump.html|2|https://self-learning-java-tutorial.blogspot.com/2018/08/jmap-force-heap-dump-generation.html^0|0|I|0|0|0|9|0|0|2|4|0|0|1D|4|1|0|0|8|0|0|H|4|2|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1E|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1F|8|@]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|N|3|O|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|P|3|Q|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|R|3|S|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|1R|8|@]|D|@$9|1S|A|1T|1|1U]]|E|$]]|$1|V|3|-4|5|6|7|1V|8|@]|D|@]|E|$]]]|W|$X|$5|Y|Z|10|E|$11|12]]|13|$5|Y|Z|10|E|$11|14]]|15|$5|Y|Z|10|E|$11|16]]]]

How to get process id of java application?

Execute the command 'jcmd' to get the process id of java applications.

How to get Thread dump?

jcmd PID Thread.print > thread.dump

Reference <a href="https://self-learning-java-tutorial.blogspot.com/2018/08/jcmd-threadprint-get-thread-dumps.html" rel="noreferrer">link</a>

You can even use jstack to get thread dump (jstack PID > thread.dump). Reference <a href="https://self-learning-java-tutorial.blogspot.com/2018/08/jstack-get-thread-dump.html" rel="noreferrer">link</a>

How to get heap dump?

Use jmap tool to get heap dump.
jmap -F -dump:live,format=b,file=heap.bin PID

PID stands for process id of the application. Reference <a href="https://self-learning-java-tutorial.blogspot.com/2018/08/jmap-force-heap-dump-generation.html" rel="noreferrer">link</a>

blocks|key|3777362|text|如果您使用的是JDK1.6或更高版本，则可以使用jmap命令获取Java进程的堆转储，条件是您应该知道ProcessID。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3777363|如果您使用的是Windows计算机，则可以使用任务管理器获取PID。对于Linux机器，您可以使用各种命令，如ps+-A+%7C+grep+java、netstat+-tupln+%7C+grep+java或top+%7C+grep+java，具体取决于您的应用程序。|3777364|然后，您可以使用类似jmap+-dump:format=b,file=sample_heap_dump.hprof+1234的命令，其中1234是PID。|3777365|有多种tool+available可以解释hprof文件。我将推荐Oracle的visualvm工具，它使用起来很简单。|3777366|entityMap|0|LINK|mutability|MUTABLE|url|http://www.oracle.com/technetwork/java/javase/tooldescr-136044.html^0|O|4|0|1J|H|21|Q|2S|F|0|A|1G|0|3|E|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|L|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]]]

If you are using JDK 1.6 or above, You can use <code>jmap</code> command to take a heap Dump of a Java process, condition is you should known ProcessID.

If you are on Windows Machine, you can use Task Manager to get PID. For Linux machine you can use varieties of command like <code>ps -A | grep java</code> or <code>netstat -tupln | grep java</code> or <code>top | grep java</code>, depends on your application.

Then you can use the command like <code>jmap -dump:format=b,file=sample_heap_dump.hprof 1234</code> where 1234 is PID.

There are varieties of <a href="http://www.oracle.com/technetwork/java/javase/tooldescr-136044.html" rel="nofollow">tool available</a> to interpret the hprof file. I will recommend Oracle's visualvm tool, which is simple to use.

blocks|key|3777497|text|如果您由于某种原因不能(或不想)使用控制台/终端，还有一种替代解决方案。您可以让Java应用程序为您打印线程转储。收集Stack+Trace的代码相当简单，可以附加到按钮或web界面上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3777498|private+static+String+getThreadDump()+{
++++Map<Thread,+StackTraceElement[]>+allStackTraces+=+Thread.getAllStackTraces();

++++StringBuilder+out+=+new+StringBuilder();
++++for+(Map.Entry<Thread,+StackTraceElement[]>+entry+:+allStackTraces.entrySet())+{
++++++++Thread+thread+=+entry.getKey();
++++++++StackTraceElement[]+elements+=+entry.getValue();
++++++++out.append(String.format("%25s+%7C+prio=%25d+%7C+%25s",+thread.getName(),+thread.getPriority(),+thread.getState()));
++++++++out.append('\n');

++++++++for+(StackTraceElement+element+:+elements)+{
++++++++++++out.append(element.toString()).append('\n');
++++++++}
++++++++out.append('\n');
++++}
++++return+out.toString();
}|code-block|syntax|javascript|3777499|此方法将返回如下所示的字符串：|3777500|main+%7C+prio=5+%7C+RUNNABLE
java.lang.Thread.dumpThreads(Native+Method)
java.lang.Thread.getAllStackTraces(Thread.java:1607)
Main.getThreadDump(Main.java:8)
Main.main(Main.java:36)

Monitor+Ctrl-Break+%7C+prio=5+%7C+RUNNABLE
java.net.PlainSocketImpl.initProto(Native+Method)
java.net.PlainSocketImpl.<clinit>(PlainSocketImpl.java:45)
java.net.Socket.setImpl(Socket.java:503)
java.net.Socket.<init>(Socket.java:424)
java.net.Socket.<init>(Socket.java:211)
com.intellij.rt.execution.application.AppMainV2$1.run(AppMainV2.java:59)

Finalizer+%7C+prio=8+%7C+WAITING
java.lang.Object.wait(Native+Method)
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

Reference+Handler+%7C+prio=10+%7C+WAITING
java.lang.Object.wait(Native+Method)
java.lang.Object.wait(Object.java:502)
java.lang.ref.Reference.tryHandlePending(Reference.java:191)
java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)|3777501|对于那些对带有流的Java+8版本感兴趣的人，代码甚至更紧凑：|3777502|private+static+String+getThreadDump()+{
++++Map<Thread,+StackTraceElement[]>+allStackTraces+=+Thread.getAllStackTraces();
++++StringBuilder+out+=+new+StringBuilder();
++++allStackTraces.forEach((thread,+elements)+->+{
++++++++out.append(String.format("%25s+%7C+prio=%25d+%7C+%25s",+thread.getName(),+thread.getPriority(),+thread.getState()));
++++++++out.append('\n');

++++++++Arrays.stream(elements).forEach(element+->+out.append(element.toString()).append('\n'));
++++++++out.append('\n');
++++});
++++return+out.toString();
}|3777503|您可以使用以下命令轻松测试此代码：|3777504|System.out.print(getThreadDump());|3777505|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

If you can't (or don't want) to use the console/terminal for some reason, there is an alternative solution. You can make the Java application print the thread dump for you. The code that collects the Stack Trace is reasonable simple and can be attached to a button or a web interface.

<pre><code>private static String getThreadDump() {
 Map&lt;Thread, StackTraceElement[]&gt; allStackTraces = Thread.getAllStackTraces();

 StringBuilder out = new StringBuilder();
 for (Map.Entry&lt;Thread, StackTraceElement[]&gt; entry : allStackTraces.entrySet()) {
 Thread thread = entry.getKey();
 StackTraceElement[] elements = entry.getValue();
 out.append(String.format("%s | prio=%d | %s", thread.getName(), thread.getPriority(), thread.getState()));
 out.append('\n');

 for (StackTraceElement element : elements) {
 out.append(element.toString()).append('\n');
 }
 out.append('\n');
 }
 return out.toString();
}
</code></pre>

This method will return a string that looks like this:

<pre><code>main | prio=5 | RUNNABLE
java.lang.Thread.dumpThreads(Native Method)
java.lang.Thread.getAllStackTraces(Thread.java:1607)
Main.getThreadDump(Main.java:8)
Main.main(Main.java:36)

Monitor Ctrl-Break | prio=5 | RUNNABLE
java.net.PlainSocketImpl.initProto(Native Method)
java.net.PlainSocketImpl.&lt;clinit&gt;(PlainSocketImpl.java:45)
java.net.Socket.setImpl(Socket.java:503)
java.net.Socket.&lt;init&gt;(Socket.java:424)
java.net.Socket.&lt;init&gt;(Socket.java:211)
com.intellij.rt.execution.application.AppMainV2$1.run(AppMainV2.java:59)

Finalizer | prio=8 | WAITING
java.lang.Object.wait(Native Method)
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)

Reference Handler | prio=10 | WAITING
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:502)
java.lang.ref.Reference.tryHandlePending(Reference.java:191)
java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
</code></pre>

For those interested in a Java 8 version with streams, the code is even more compact:

<pre><code>private static String getThreadDump() {
 Map&lt;Thread, StackTraceElement[]&gt; allStackTraces = Thread.getAllStackTraces();
 StringBuilder out = new StringBuilder();
 allStackTraces.forEach((thread, elements) -&gt; {
 out.append(String.format("%s | prio=%d | %s", thread.getName(), thread.getPriority(), thread.getState()));
 out.append('\n');

 Arrays.stream(elements).forEach(element -&gt; out.append(element.toString()).append('\n'));
 out.append('\n');
 });
 return out.toString();
}
</code></pre>

You can easily test this code with:

<pre><code>System.out.print(getThreadDump());
</code></pre>

blocks|key|1452425|text|也许是jcmd|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1452426|Jcmd实用程序用于向发送诊断命令请求，这些请求对于控制飞行记录、故障排除和诊断JVM和Java应用程序非常有用。|style|BOLD|1452427|jcmd工具是在Oracle的Java+7中引入的，通过使用它来识别Java进程的in+(类似于jps)、获取堆转储(类似于jmap)、获取线程转储(类似于jstack)、查看虚拟机特征(例如系统属性和命令行标志(类似于jinfo)+)以及获取垃圾收集统计信息(类似于jstat)，jcmd工具在解决JVM应用程序问题时特别有用。jcmd工具被称为“调查和解决JVM应用程序问题的瑞士军刀”和“隐藏的宝石”。|1452428|下面是在调用jcmd时需要使用的过程|CODE|1452429|1452430|转到jcmd+<pid>+GC.heap_dump+<file-path>+|ordered-list-item|1452431|，其中|1452432|pid:是将捕获堆转储的Java进程Id，|1452433|是打印堆转储的文件路径。|1452434|有关使用Java+heap+dump的更多信息，请查看此链接。|1452435|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/8/docs/technotes/tools/windows/jcmd.html|1|https://javatutorial.net/capture-java-heap-dump^0|3|4|0|0|B|H|0|0|6|4|0|0|2|Z|0|0|0|0|4|E|1|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|D|3|E|5|6|7|1C|8|@$A|1D|B|1E|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|1F|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1G|8|@$A|1H|B|1I|F|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1J|8|@]|9|@]|C|$]]|$1|N|3|O|5|P|7|1K|8|@$A|1L|B|1M|F|L]]|9|@]|C|$]]|$1|Q|3|R|5|P|7|1N|8|@]|9|@]|C|$]]|$1|S|3|T|5|P|7|1O|8|@]|9|@]|C|$]]|$1|U|3|V|5|6|7|1P|8|@]|9|@]|C|$]]|$1|W|3|X|5|6|7|1Q|8|@]|9|@$A|1R|B|1S|1|1T]]|C|$]]|$1|Y|3|-4|5|6|7|1U|8|@]|9|@]|C|$]]]|Z|$10|$5|11|12|13|C|$14|15]]|16|$5|11|12|13|C|$14|17]]]]

Maybe <a href="https://docs.oracle.com/javase/8/docs/technotes/tools/windows/jcmd.html" rel="nofollow noreferrer">jcmd</a>?

Jcmd utility is used to send diagnostic command requests to the JVM, where these requests are useful for controlling Java Flight Recordings, troubleshoot, and diagnose JVM and Java Applications.

The jcmd tool was introduced with Oracle's Java 7 and is particularly useful in troubleshooting issues with JVM applications by using it to identify Java processes' IDs (akin to jps), acquiring heap dumps (akin to jmap), acquiring thread dumps (akin to jstack), viewing virtual machine characteristics such as system properties and command-line flags (akin to jinfo), and acquiring garbage collection statistics (akin to jstat). The jcmd tool has been called "a swiss-army knife for investigating and resolving issues with your JVM application" and a "hidden gem."

Here’s the process you’ll need to use in invoking the <code>jcmd</code>:

<ol>
<li>Go to <code>jcmd &lt;pid&gt; GC.heap_dump &lt;file-path&gt;</code> </li>
<li>In which </li>
<li>pid: is a Java Process Id, for which the heap dump will be captured Also, the</li>
<li>file-path: is a file path in which the heap dump is be printed.</li>
</ol>

Check it out for more information about taking <a href="https://javatutorial.net/capture-java-heap-dump" rel="nofollow noreferrer">Java heap dump</a>.

blocks|key|3777675|text|为了在windows中从子java进程中获取线程转储/堆转储，您需要在第一步中标识子进程Id。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3777676|通过发出命令:+java+jps，您将能够获得在您的机器上运行的所有java进程Ids。从该列表中，您需要选择子进程Id。一旦有了子进程Id，就可以使用各种选项来捕获线程转储和堆转储。|offset|length|style|BOLD|3777677|捕获线程转储：|3777678|有8个选项可以捕获线程转储：|3777679|Ctrl键(+|3777680|jstack|ordered-list-item|3777681|kill+-3|3777682|jvisualVM|3777683|JMC|3777684|Windows+%2B+Break)|3777685|ThreadMXBean|3777686|APM+Tools|3777687|jcmd|3777688|3777689|有关每个选项的详细信息，请访问in+this+article。一旦你捕获了线程转储，你就可以使用像fastThread，Samuraito+analyze线程转储这样的工具。|3777690|捕获堆转储：|3777691|有7个选项可以捕获堆转储：|3777692|3777693|jmap|3777694|3777695|3777696|-XX:%2BHeapDumpOnOutOfMemoryError|3777697|3777698|3777699|3777700|3777701|3777702|JVisualVM|3777703|3777704|3777705|JMX|3777706|3777707|3777708|Programmatic+Approach|3777709|3777710|3777711|Administrative+consoles|3777712|3777713|有关每个选项的详细信息，请访问in+this+article。一旦捕获了堆转储，就可以使用Eclipse+Memory+Analysis+tool、HeapHero等工具来分析捕获的堆转储。|3777714|entityMap|0|LINK|mutability|MUTABLE|url|https://www.eclipse.org/|1|https://heaphero.io/|2|https://github.com/yusuke/samurai|3|4|5^0|0|Q|1U|0|0|7|0|0|E|0|0|7|0|0|6|0|0|7|0|0|9|0|0|3|0|0|G|0|0|C|0|0|9|0|0|4|0|0|0|2F|F|F|0|1D|A|1|1O|9|2|0|0|6|0|0|D|0|0|0|4|0|0|0|0|V|0|0|0|0|4|0|0|0|0|9|0|0|0|0|3|0|0|0|0|L|0|0|0|0|N|0|0|0|2N|F|F|3|19|S|4|22|8|5|0^^$0|@$1|2|3|4|5|6|7|2J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|2K|8|@$D|2L|E|2M|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|2N|8|@$D|2O|E|2P|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|2Q|8|@$D|2R|E|2S|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|2T|8|@$D|2U|E|2V|F|G]]|9|@]|A|$]]|$1|N|3|O|5|P|7|2W|8|@$D|2X|E|2Y|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|P|7|2Z|8|@$D|30|E|31|F|G]]|9|@]|A|$]]|$1|S|3|T|5|P|7|32|8|@$D|33|E|34|F|G]]|9|@]|A|$]]|$1|U|3|V|5|P|7|35|8|@$D|36|E|37|F|G]]|9|@]|A|$]]|$1|W|3|X|5|P|7|38|8|@$D|39|E|3A|F|G]]|9|@]|A|$]]|$1|Y|3|Z|5|P|7|3B|8|@$D|3C|E|3D|F|G]]|9|@]|A|$]]|$1|10|3|11|5|P|7|3E|8|@$D|3F|E|3G|F|G]]|9|@]|A|$]]|$1|12|3|13|5|P|7|3H|8|@$D|3I|E|3J|F|G]]|9|@]|A|$]]|$1|14|3|-4|5|6|7|3K|8|@]|9|@]|A|$]]|$1|15|3|16|5|6|7|3L|8|@$D|3M|E|3N|F|G]]|9|@$D|3O|E|3P|1|3Q]|$D|3R|E|3S|1|3T]|$D|3U|E|3V|1|3W]]|A|$]]|$1|17|3|18|5|6|7|3X|8|@$D|3Y|E|3Z|F|G]]|9|@]|A|$]]|$1|19|3|1A|5|6|7|40|8|@$D|41|E|42|F|G]]|9|@]|A|$]]|$1|1B|3|-4|5|6|7|43|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|P|7|44|8|@$D|45|E|46|F|G]]|9|@]|A|$]]|$1|1E|3|-4|5|6|7|47|8|@]|9|@]|A|$]]|$1|1F|3|-4|5|6|7|48|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|P|7|49|8|@$D|4A|E|4B|F|G]]|9|@]|A|$]]|$1|1I|3|-4|5|6|7|4C|8|@]|9|@]|A|$]]|$1|1J|3|-4|5|6|7|4D|8|@]|9|@]|A|$]]|$1|1K|3|13|5|P|7|4E|8|@$D|4F|E|4G|F|G]]|9|@]|A|$]]|$1|1L|3|-4|5|6|7|4H|8|@]|9|@]|A|$]]|$1|1M|3|-4|5|6|7|4I|8|@]|9|@]|A|$]]|$1|1N|3|1O|5|P|7|4J|8|@$D|4K|E|4L|F|G]]|9|@]|A|$]]|$1|1P|3|-4|5|6|7|4M|8|@]|9|@]|A|$]]|$1|1Q|3|-4|5|6|7|4N|8|@]|9|@]|A|$]]|$1|1R|3|1S|5|P|7|4O|8|@$D|4P|E|4Q|F|G]]|9|@]|A|$]]|$1|1T|3|-4|5|6|7|4R|8|@]|9|@]|A|$]]|$1|1U|3|-4|5|6|7|4S|8|@]|9|@]|A|$]]|$1|1V|3|1W|5|P|7|4T|8|@$D|4U|E|4V|F|G]]|9|@]|A|$]]|$1|1X|3|-4|5|6|7|4W|8|@]|9|@]|A|$]]|$1|1Y|3|-4|5|6|7|4X|8|@]|9|@]|A|$]]|$1|1Z|3|20|5|P|7|4Y|8|@$D|4Z|E|50|F|G]]|9|@]|A|$]]|$1|21|3|-4|5|6|7|51|8|@]|9|@]|A|$]]|$1|22|3|23|5|6|7|52|8|@$D|53|E|54|F|G]]|9|@$D|55|E|56|1|57]|$D|58|E|59|1|5A]|$D|5B|E|5C|1|5D]]|A|$]]|$1|24|3|-4|5|6|7|5E|8|@]|9|@]|A|$]]]|25|$26|$5|27|28|29|A|$2A|2B]]|2C|$5|27|28|29|A|$2A|2D]]|2E|$5|27|28|29|A|$2A|2F]]|2G|$5|27|28|29|A|$2A|2B]]|2H|$5|27|28|29|A|$2A|2B]]|2I|$5|27|28|29|A|$2A|2D]]]]

Inorder to take thread dump/heap dump from a child java process in windows, you need to identify the child process Id as first step.
By issuing the command: jps you will be able get all java process Ids that are running on your windows machine. From this list you need to select child process Id. Once you have child process Id, there are various options to capture thread dump and heap dumps.
Capturing Thread Dumps:
There are 8 options to capture thread dumps:
<ol>
<li>jstack</li>
<li>kill -3</li>
<li>jvisualVM</li>
<li>JMC</li>
<li>Windows (Ctrl + Break)</li>
<li>ThreadMXBean</li>
<li>APM Tools</li>
<li>jcmd</li>
</ol>
Details about each option can be found <a href="https://www.eclipse.org/" rel="nofollow noreferrer">in this article</a>. Once you have capture thread dumps, you can use tools like <a href="https://heaphero.io/" rel="nofollow noreferrer">fastThread</a>, <a href="https://github.com/yusuke/samurai" rel="nofollow noreferrer">Samuraito</a> analyze thread dumps.
Capturing Heap Dumps:
There are 7 options to capture heap dumps: 
<ol>
<li>jmap 
</li>
<li>-XX:+HeapDumpOnOutOfMemoryError 
</li>
<li>jcmd 
</li>
<li>JVisualVM 
</li>
<li>JMX 
</li>
<li>Programmatic Approach 
</li>
<li>Administrative consoles 
</li>
</ol>
Details about each option can be found <a href="https://www.eclipse.org/" rel="nofollow noreferrer">in this article</a>. Once you have captured heap dump, you may use tools like <a href="https://www.eclipse.org/" rel="nofollow noreferrer">Eclipse Memory Analysis tool</a>, <a href="https://heaphero.io/" rel="nofollow noreferrer">HeapHero</a> to analyze the captured heap dumps.

blocks|key|5195285|text|Visualvm后续内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5195286|如果你因为没有使用正确的JVM参数启动JVM而“无法连接”到正在运行的JVM(它在远程机器上)，那么在远程机器上运行jstatd，然后，假设你有一个直接连接，将它添加到visualvm中作为“远程主机”，双击主机名，然后那个机器上的所有其他JVM都会神奇地出现在visualvm中。|offset|length|style|CODE|5195287|如果你没有“直接连接”到机器上的端口，你也可以通过一个proxy来实现。|5195288|一旦你可以看到你想要的进程，在jvisualvm中钻取它并使用监视器选项卡->+"heapdump“按钮。|5195289|entityMap|0|LINK|mutability|MUTABLE|url|https://dzone.com/articles/visualvm-monitoring-remote-jvm^0|0|1M|6|0|R|5|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

Visualvm followup:

If you "can't connect" to your running JVM from jvisualvm because you didn't start it with the right JVM arguments (and it's on remote box), run <code>jstatd</code> on the remote box, then, assuming you have a direct connection, add it as a "remote host" in visualvm, double click the host name, and all other JVM's on that box will magically show up in visualvm.

If you don't have "direct connection" to ports on that box, you can also do this through a <a href="https://dzone.com/articles/visualvm-monitoring-remote-jvm" rel="nofollow noreferrer">proxy</a>. 

Once you can see the process you want, drill into it in jvisualvm and use monitor tab -> "heapdump" button.

blocks|key|3777582|text|下面的java代码用于通过提供PID来获取Java进程的堆转储。该程序使用远程JMX连接转储堆。这可能会对某些人有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3777583|import+java.lang.management.ManagementFactory;
import+javax.management.MBeanServerConnection;
import+javax.management.remote.JMXConnector;
import+javax.management.remote.JMXConnectorFactory;
import+javax.management.remote.JMXServiceURL;
import+java.lang.reflect.Method;

public+class+HeapDumper+{

public+static+final+String+HOST+=+"192.168.11.177";
public+static+final+String+PORT+=+"1600";
public+static+final+String+FILE_NAME+=+"heapDump.hprof";
public+static+final+String+FOLDER_PATH+=+"C:/";
private+static+final+String+HOTSPOT_BEAN_NAME+="com.sun.management:type=HotSpotDiagnostic";

public+static+void+main(String[]+args)+{
++++if(args.length+==+0)+{
++++++++System.out.println("Enter+PID+of+the+Java+Process+!!!");
++++++++return;
++++}

++++String+pidString+=+args[0];
++++int+pid+=+-1;
++++if(pidString!=null+&&+pidString.length()+>+0)+{
++++++++try+{
++++++++++++pid+=+Integer.parseInt(pidString);
++++++++}
++++++++catch(Exception+e)+{
++++++++++++System.out.println("PID+is+not+Valid+!!!");
++++++++++++return;
++++++++}
++++}
++++boolean+isHeapDumpSuccess+=+false;
++++boolean+live+=+true;
++++if(pid+>+0)+{
++++++++MBeanServerConnection+beanServerConn+=+getJMXConnection();

++++++++if(beanServerConn!=null)+{
++++++++++++Class+clazz+=+null;
++++++++++++String+dumpFile+=+FOLDER_PATH%2B"/"%2BFILE_NAME;
++++++++++++try{
++++++++++++++++clazz+=+Class.forName("com.sun.management.HotSpotDiagnosticMXBean");
++++++++++++++++Object+hotspotMBean+=+ManagementFactory.newPlatformMXBeanProxy(beanServerConn,+HOTSPOT_BEAN_NAME,+clazz);
++++++++++++++++Method+method+=+clazz.getMethod("dumpHeap",+new+Class[]{String.class+,+boolean.class});
++++++++++++++++method.setAccessible(true);
++++++++++++++++method.invoke(hotspotMBean+,+new+Object[]+{dumpFile,+new+Boolean(live)});
++++++++++++++++isHeapDumpSuccess+=+true;
++++++++++++}
++++++++++++catch(Exception+e){
++++++++++++++++e.printStackTrace();
++++++++++++++++isHeapDumpSuccess+=+false;
++++++++++++}
++++++++++++finally{
++++++++++++++++clazz+=+null;
++++++++++++}
++++++++}
++++}

++++if(isHeapDumpSuccess){
++++++++System.out.println("HeapDump+is+Success+!!!");
++++}
++++else{
++++++++System.out.println("HeapDump+is+not+Success+!!!");
++++}
}

private+static+MBeanServerConnection+getJMXConnection()+{
++++MBeanServerConnection+mbeanServerConnection+=+null;
++++String+urlString+=+"service:jmx:rmi:///jndi/rmi://"+%2B+HOST+%2B+":"+%2B+PORT+%2B+"/jmxrmi";
++++try+{
++++++++JMXServiceURL+url+=+new+JMXServiceURL(urlString);
++++++++JMXConnector+jmxConnector+=+JMXConnectorFactory.connect(url);
++++++++mbeanServerConnection+=+jmxConnector.getMBeanServerConnection();
++++++++System.out.println("JMX+Connection+is+Success+for+the+URL+:"%2BurlString);
++++}
++++catch(Exception+e)+{
++++++++System.out.println("JMX+Connection+Failed+!!!");
++++}
++++return+mbeanServerConnection;
}|code-block|syntax|javascript|3777584|}|3777585|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Below java code is used to get the Heap Dump of a Java Process by providing PID. The Program uses Remote JMX connection to dump heap. It may be helpful for some one.

<pre><code>import java.lang.management.ManagementFactory;
import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.lang.reflect.Method;

public class HeapDumper {

public static final String HOST = "192.168.11.177";
public static final String PORT = "1600";
public static final String FILE_NAME = "heapDump.hprof";
public static final String FOLDER_PATH = "C:/";
private static final String HOTSPOT_BEAN_NAME ="com.sun.management:type=HotSpotDiagnostic";

public static void main(String[] args) {
 if(args.length == 0) {
 System.out.println("Enter PID of the Java Process !!!");
 return;
 }

 String pidString = args[0];
 int pid = -1;
 if(pidString!=null &amp;&amp; pidString.length() &gt; 0) {
 try {
 pid = Integer.parseInt(pidString);
 }
 catch(Exception e) {
 System.out.println("PID is not Valid !!!");
 return;
 }
 }
 boolean isHeapDumpSuccess = false;
 boolean live = true;
 if(pid &gt; 0) {
 MBeanServerConnection beanServerConn = getJMXConnection();

 if(beanServerConn!=null) {
 Class clazz = null;
 String dumpFile = FOLDER_PATH+"/"+FILE_NAME;
 try{
 clazz = Class.forName("com.sun.management.HotSpotDiagnosticMXBean");
 Object hotspotMBean = ManagementFactory.newPlatformMXBeanProxy(beanServerConn, HOTSPOT_BEAN_NAME, clazz);
 Method method = clazz.getMethod("dumpHeap", new Class[]{String.class , boolean.class});
 method.setAccessible(true);
 method.invoke(hotspotMBean , new Object[] {dumpFile, new Boolean(live)});
 isHeapDumpSuccess = true;
 }
 catch(Exception e){
 e.printStackTrace();
 isHeapDumpSuccess = false;
 }
 finally{
 clazz = null;
 }
 }
 }

 if(isHeapDumpSuccess){
 System.out.println("HeapDump is Success !!!");
 }
 else{
 System.out.println("HeapDump is not Success !!!");
 }
}

private static MBeanServerConnection getJMXConnection() {
 MBeanServerConnection mbeanServerConnection = null;
 String urlString = "service:jmx:rmi:///jndi/rmi://" + HOST + ":" + PORT + "/jmxrmi";
 try {
 JMXServiceURL url = new JMXServiceURL(urlString);
 JMXConnector jmxConnector = JMXConnectorFactory.connect(url);
 mbeanServerConnection = jmxConnector.getMBeanServerConnection();
 System.out.println("JMX Connection is Success for the URL :"+urlString);
 }
 catch(Exception e) {
 System.out.println("JMX Connection Failed !!!");
 }
 return mbeanServerConnection;
}
</code></pre>

}

blocks|key|1456712|text|在Oracle+JDK上，我们有一个名为jmap的命令(位于Java+Home的bin文件夹中)。该命令的用法如下|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1456713|1456714|+jmap+(选项)+(pid)|blockquote|1456715|1456716|1456717|示例:+jmap+-dump:live，format=b，file=heap.bin+(pid)|1456718|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|M|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|N|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|K|$]]

On a Oracle JDK, we have a command called jmap (available in the bin folder of Java Home).
usage of the command comes as follows

<blockquote>
 jmap (option) (pid)
</blockquote>

Example: jmap -dump:live,format=b,file=heap.bin (pid)

I have a Java application that I run from a console which in turn executes an another Java process. I want to get a thread/heap dump of that child process.

On Unix, I could do a <code>kill -3 &lt;pid&gt;</code> but on Windows AFAIK the only way to get a thread dump is Ctrl-Break in the console. But that only gives me the dump of the parent process, not the child.

Is there another way to get that heap dump?

How to get a thread and heap dump of a Java process on Windows that's not running in a console

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个从控制台运行的Java应用程序，该控制台又执行另一个Java进程。我想获取该子进程的线程/堆转储。在Unix上，我可以执行kill -3 <pid>，但在Windows AFAIK上，获取线程转储的唯一方法是在控制台中按Ctrl-Break。但这只给了我父进程的转储，而不是子进程。有没有其他方法可以获得堆转储？

问如何获取Windows上未在控制台中运行的Java进程的线程和堆转储
EN

回答 19

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