List of Java processes

Question

How can I list all Java processes in bash  I need an command line  I know there is command ps but I don t know what parameters I need to use

User · Answer

ps aux   grep java  or    ps -fea grep -i java

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When I want to know if a certain Java class is getting executed  I use the following command line   ps ww -f -C java   grep  fully qualified name of class    From the OS side view  the process s command name is  java   The  ww  option widens the colum s maximum characters  so it s possible to grep the FQN of the related class

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There s a lot of ways of doing this  You can use java lang ProcessBuilder and  pgrep  to get the process id  PID  with something like  pgrep -fl java   awk   print  1    Or  if you are running under Linux  you can query the  proc directory   I know  this seems horrible  and non portable  and even poorly implemented  I agree  But because Java actually runs in a VM  for some absurd reason that I can t really figure out after more then 15 years working the JDK  is why it isn t possible to see things outside the JVM space  it s really ridiculous with you think about it  You can do everything else  even fork and join child processes  those were an horrible way of multitasking when the world didn t know about threads or pthreads  what a hell  what s going in on with Java         This will give an immense discussion I know  but anyways  there s a very good API that I already used in my projects and it s stable enough  it s OSS so you still need to stress test every version you use before really trusting the API   https   github com jezhumble javasysmon  JavaDoc  http   jezhumble github io javasysmon   search for the class com jezhumble javasysmon OsProcess  she will do the trick  Hope it helped  best of luck

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This will return all the running java processes in linux environment  Then you can kill the process using the process ID   ps -e grep java

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If I want simply list java processes  use    ps -A   grep java

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ps -eaf   grep  j ava   It s better since it will only show you the active processes not including this command that also got java string the    does the trick

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ps axuwww   grep java   grep -v grep   The above will   show you all processes with long lines  arg  www  filter  grep  only lines what contain the word java  and filter out the line  grep java        btw  this example is not the effective one  but simple to remember      you can pipe the above to another commands  for example   ps axuwww   grep java   grep -v grep   sed            while read something do     something another  something done   etc

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You can use single command pgrep as well  doesn t require you to use pipes and multiple commands    pgrep -fl java

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The following commands will return only Java ProcessIDs  These commands are very useful especially whenever you want to feed another process by these return values  java PIDs   sudo netstat -nlpt   awk   java   print  7     tr   java      sudo netstat -nlpt   awk   java   print  7     sed  s   java   g  But if you remove the latest pipe  you will be noticed these are java process sudo netstat -nlpt   awk   java   print  7   sudo netstat -nlpt   awk   java   print  7

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For better output format check this command   ps -fC java

User · Answer

try   ps aux   grep java   and see how you get on

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I use this  good on Debian 8    alias psj  ps --no-headers -ww -C java -o pid user start time command

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jps -lV   is most useful  Prints just pid and qualified main class name   2472 com intellij idea Main 11111 sun tools jps Jps 9030 play server Server 2752 org jetbrains idea maven server RemoteMavenServer

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pgrep -l java ps -ef   grep java

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Recent Java comes with Java Virtual Machine Process Status Tool  jps   http   download oracle com javase 1 5 0 docs tooldocs share jps html  For example    nsushkin fulton support   jps -m 2120 Main --userdir  home nsushkin  netbeans 7 0 --branding nb 26546 charles jar 17600 Jps -m

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jps  amp  jcmd wasn t showing me any results when I tried it using using openjdk-1 8 on redhat linux  But even if it did it only shows processes under the current user which doesn t work in my case  Using the ps grep is what I ended up doing but the class path for some java apps can be extremely long which makes results illegible so I used sed to remove it  This is a bit rough still but removes everything except  PID  User  java-class jar  args   ps -o pid user cmd -C java   sed -e  s    0-9                                1  2   -e  s -c              -        g    Results look something like     PID USER     CMD 11251 userb org apache zookeeper server quorum QuorumPeerMain    config zookeeper properties 19574 userb com intellij idea Main 28807 root org apache nifi bootstrap RunNiFi run 28829 root org apache nifi NiFi   An alternative on windows to list all processes is   WMIC path win32 process where  Caption  java exe   get ProcessId Commandline   But that is going to need some parsing to make it more legible

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Starting from Java 7  the simplest way and less error prone is to simply use the command jcmd that is part of the JDK such that it will work the same way on all OS   Example    gt  jcmd 5485 sun tools jcmd JCmd 2125 MyProgram      jcmd allows to send diagnostic command requests to a running Java   Virtual Machine  JVM     More details about how to use jcmd   See also the jcmd Utility

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To know the list of java running on the linux machine  ps -e   grep java

[linux] List of Java processes

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