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

Question

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 kill -3  lt pid gt  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

User · Answer

You have to redirect output from second java executable to some file  Then  use SendSignal to send  -3  to your second process

User · Answer

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   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        This method will return a string that looks like this   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    For those interested in a Java 8 version with streams  the code is even more compact   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        You can easily test this code with   System out print getThreadDump

User · Answer

You have to redirect output from second java executable to some file  Then  use SendSignal to send  -3  to your second process

User · Answer

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   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        This method will return a string that looks like this   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    For those interested in a Java 8 version with streams  the code is even more compact   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        You can easily test this code with   System out print getThreadDump

User · Answer

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

User · Answer

If you are on server-jre 8 and above you can use this   jcmd PID GC heap dump  tmp dump

User · Answer

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 link  You can even use jstack to get thread dump  jstack PID   thread dump   Reference link  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 link

User · Answer

If you are using JDK 1 6 or above  You can use jmap 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 ps -A   grep java or  netstat -tupln   grep java or top   grep java  depends on your application   Then you can use the command like jmap -dump format b file sample heap dump hprof 1234 where 1234 is PID   There are varieties of tool available to interpret the hprof file  I will recommend Oracle s visualvm tool  which is simple to use

User · Answer

You can send the kill -3  lt pid gt  from Cygwin  You have to use the Cygwin ps options to find windows processes then just send the signal to that process

User · Answer

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 PsExec and jcmd  named jvmdump bat  which dumps the threads  heap  system properties  and JVM args      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    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 Session 0 and run it from there   e g    PsExec  -s -h -d -i 0 cmd exe   This will prompt you  click the taskbar icon at the bottom  to View the message in the interactive session  which will take you to the new console in the other session from which you can run the jvmdump bat script

User · Answer

Try one of below options    For 32 bit JVM   jmap -dump format b file  lt heap dump filename gt   lt pid gt   For 64 bit JVM  explicitly quoting    jmap -J-d64 -dump format b file  lt heap dump filename gt   lt pid gt   For 64 bit JVM with G1GC algorithm in VM parameters  Only live objects heap is generated with G1GC algorithm     jmap -J-d64 -dump live format b file  lt heap dump filename gt   lt pid gt     Related SE question  Java heap dump error with jmap command   Premature EOF   Have a look at various options of jmap at this article

User · Answer

You could run jconsole  included with Java 6 s SDK  then connect to your Java application  It will show you every Thread running and its stack trace

User · Answer

Maybe jcmd   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 jcmd    Go to jcmd  lt pid gt  GC heap dump  lt file-path gt   In which  pid  is a Java Process Id  for which the heap dump will be captured Also  the file-path  is a file path in which the heap dump is be printed    Check it out for more information about taking Java heap dump

User · Answer

In addition to using the mentioned jconsole visualvm  you can use jstack -l  lt vm-id gt  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 jps   Both jstack and jps are include in the Sun JDK version 6 and higher

User · Answer

You can send the kill -3  lt pid gt  from Cygwin  You have to use the Cygwin ps options to find windows processes then just send the signal to that process

User · Answer

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 PsExec and jcmd  named jvmdump bat  which dumps the threads  heap  system properties  and JVM args      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    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 Session 0 and run it from there   e g    PsExec  -s -h -d -i 0 cmd exe   This will prompt you  click the taskbar icon at the bottom  to View the message in the interactive session  which will take you to the new console in the other session from which you can run the jvmdump bat script

User · Answer

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   jstack kill -3 jvisualVM JMC Windows  Ctrl   Break  ThreadMXBean APM Tools jcmd  Details about each option can be found in this article  Once you have capture thread dumps  you can use tools like fastThread  Samuraito analyze thread dumps  Capturing Heap Dumps  There are 7 options to capture heap dumps   jmap  -XX  HeapDumpOnOutOfMemoryError  jcmd  JVisualVM  JMX  Programmatic Approach  Administrative consoles   Details about each option can be found in this article  Once you have captured heap dump  you may use tools like Eclipse Memory Analysis tool  HeapHero to analyze the captured heap dumps

User · Answer

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

User · Answer

If you want a heapdump on out-of-memory  you can start Java with the option -XX -HeapDumpOnOutOfMemoryError   c f  JVM Options reference page

User · Answer

If you want a heapdump on out-of-memory  you can start Java with the option -XX -HeapDumpOnOutOfMemoryError   c f  JVM Options reference page

User · Answer

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

User · Answer

You are confusing two different java dumps   kill -3 generates a thread dump  not a heap dump   Thread dump   stack traces for each thread in the JVM output to stdout as text  Heap dump   memory contents for the JVM process output to a binary file   To take a thread dump on Windows  CTRL BREAK if your JVM is the foreground process is the simplest way   If you have a unix-like shell on Windows like Cygwin or MobaXterm  you can use kill -3  pid  like you can in Unix  To take a thread dump in Unix  CTRL C if your JVM is the foreground process or kill -3  pid  will work as long as you get the right PID for the JVM  With either platform  Java comes with several utilities that can help   For thread dumps  jstack  pid  is your best bet  http   docs oracle com javase 1 5 0 docs tooldocs share jstack html Just to finish the dump question out  Heap dumps are not commonly used because they are difficult to interpret   But  they have a lot of useful information in them if you know where how to look at them   The most common usage is to locate memory leaks   It is a good practice to set the -D on the java command-line so that the heap dump is generated automatically upon an OutOfMemoryError  -XX  HeapDumpOnOutOfMemoryError  But  you can manually trigger a heap dump  also   The most common way is to use the java utility jmap  NOTE  this utility is not available on all platforms   As of JDK 1 6  jmap is available on Windows  An example command-line would look something like jmap -dump file myheap bin  pid of the JVM   The output  quot myheap bin quot  is not human readable  for most of us   and you will need a tool to analyze it   My preference is MAT   http   www eclipse org mat

User · Answer

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

User · Answer

I think the best way to create  hprof file in Linux process is with jmap command  For example  jmap -dump format b file filename hprof  PID

User · Answer

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 link  You can even use jstack to get thread dump  jstack PID   thread dump   Reference link  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 link

User · Answer

In addition to using the mentioned jconsole visualvm  you can use jstack -l  lt vm-id gt  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 jps   Both jstack and jps are include in the Sun JDK version 6 and higher

User · Answer

You can send the kill -3  lt pid gt  from Cygwin  You have to use the Cygwin ps options to find windows processes then just send the signal to that process

User · Answer

You can use jmap to get a dump of any process running  assuming you know the pid   Use Task Manager or Resource Monitor to get the pid  Then  jmap -dump format b file cheap hprof  lt pid gt    to get the heap for that process

User · Answer

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   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

User · Answer

You could run jconsole  included with Java 6 s SDK  then connect to your Java application  It will show you every Thread running and its stack trace

User · Answer

You could run jconsole  included with Java 6 s SDK  then connect to your Java application  It will show you every Thread running and its stack trace

User · Answer

You could run jconsole  included with Java 6 s SDK  then connect to your Java application  It will show you every Thread running and its stack trace

User · Answer

You have to redirect output from second java executable to some file  Then  use SendSignal to send  -3  to your second process

User · Answer

I think the best way to create  hprof file in Linux process is with jmap command  For example  jmap -dump format b file filename hprof  PID

User · Answer

Maybe jcmd   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 jcmd    Go to jcmd  lt pid gt  GC heap dump  lt file-path gt   In which  pid  is a Java Process Id  for which the heap dump will be captured Also  the file-path  is a file path in which the heap dump is be printed    Check it out for more information about taking Java heap dump

User · Answer

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 jstatd 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 proxy     Once you can see the process you want  drill into it in jvisualvm and use monitor tab -   heapdump  button

User · Answer

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     jmap  option   pid    Example  jmap -dump live format b file heap bin  pid

User · Answer

You are confusing two different java dumps   kill -3 generates a thread dump  not a heap dump   Thread dump   stack traces for each thread in the JVM output to stdout as text  Heap dump   memory contents for the JVM process output to a binary file   To take a thread dump on Windows  CTRL BREAK if your JVM is the foreground process is the simplest way   If you have a unix-like shell on Windows like Cygwin or MobaXterm  you can use kill -3  pid  like you can in Unix  To take a thread dump in Unix  CTRL C if your JVM is the foreground process or kill -3  pid  will work as long as you get the right PID for the JVM  With either platform  Java comes with several utilities that can help   For thread dumps  jstack  pid  is your best bet  http   docs oracle com javase 1 5 0 docs tooldocs share jstack html Just to finish the dump question out  Heap dumps are not commonly used because they are difficult to interpret   But  they have a lot of useful information in them if you know where how to look at them   The most common usage is to locate memory leaks   It is a good practice to set the -D on the java command-line so that the heap dump is generated automatically upon an OutOfMemoryError  -XX  HeapDumpOnOutOfMemoryError  But  you can manually trigger a heap dump  also   The most common way is to use the java utility jmap  NOTE  this utility is not available on all platforms   As of JDK 1 6  jmap is available on Windows  An example command-line would look something like jmap -dump file myheap bin  pid of the JVM   The output  quot myheap bin quot  is not human readable  for most of us   and you will need a tool to analyze it   My preference is MAT   http   www eclipse org mat

User · Answer

You can use jmap to get a dump of any process running  assuming you know the pid   Use Task Manager or Resource Monitor to get the pid  Then  jmap -dump format b file cheap hprof  lt pid gt    to get the heap for that process

User · Answer

You have to redirect output from second java executable to some file  Then  use SendSignal to send  -3  to your second process

User · Answer

If you are using JDK 1 6 or above  You can use jmap 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 ps -A   grep java or  netstat -tupln   grep java or top   grep java  depends on your application   Then you can use the command like jmap -dump format b file sample heap dump hprof 1234 where 1234 is PID   There are varieties of tool available to interpret the hprof file  I will recommend Oracle s visualvm tool  which is simple to use

User · Answer

You can send the kill -3  lt pid gt  from Cygwin  You have to use the Cygwin ps options to find windows processes then just send the signal to that process

User · Answer

If you are on server-jre 8 and above you can use this   jcmd PID GC heap dump  tmp dump

User · Answer

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     jmap  option   pid    Example  jmap -dump live format b file heap bin  pid

User · Answer

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 jstatd 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 proxy     Once you can see the process you want  drill into it in jvisualvm and use monitor tab -   heapdump  button

User · Answer

Try one of below options    For 32 bit JVM   jmap -dump format b file  lt heap dump filename gt   lt pid gt   For 64 bit JVM  explicitly quoting    jmap -J-d64 -dump format b file  lt heap dump filename gt   lt pid gt   For 64 bit JVM with G1GC algorithm in VM parameters  Only live objects heap is generated with G1GC algorithm     jmap -J-d64 -dump live format b file  lt heap dump filename gt   lt pid gt     Related SE question  Java heap dump error with jmap command   Premature EOF   Have a look at various options of jmap at this article

User · Answer

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   jstack kill -3 jvisualVM JMC Windows  Ctrl   Break  ThreadMXBean APM Tools jcmd  Details about each option can be found in this article  Once you have capture thread dumps  you can use tools like fastThread  Samuraito analyze thread dumps  Capturing Heap Dumps  There are 7 options to capture heap dumps   jmap  -XX  HeapDumpOnOutOfMemoryError  jcmd  JVisualVM  JMX  Programmatic Approach  Administrative consoles   Details about each option can be found in this article  Once you have captured heap dump  you may use tools like Eclipse Memory Analysis tool  HeapHero to analyze the captured heap dumps

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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   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

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

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