Attach IntelliJ IDEA debugger to a running Java process

Question

Is it possible to attach the IntelliJ IDEA debugger to a running Java process  If yes  how

User · Answer

It s possible  but you have to add some JVM flags when you start your application    You have to add remote debug configuration  Edit configuration -  Remote   Then you lll find in displayed dialog window parametrs that you have to add to program execution  like   -agentlib jdwp transport dt socket server y suspend n address 5005   Then when your application is launched you can attach your debugger  If you want your application to wait until debugger is connected just change suspend flag to y  suspend y

User · Answer

Yes  Here is how you set it up   Run Configuration  Create a Remote run configuration    Run -  Edit Configurations    Click the     in the  upper left Select the  Remote  option in the left-most pane Choose a name  I named mine  remote-debugging   Click  OK  to save      JVM Options  The configuration above provides three read-only fields  These are options that tell the JVM to open up port 5005 for remote debugging when running your application  Add the appropriate one to the JVM options of the application you are debugging  One way you might do this would be like so   export JAVA OPTS  -agentlib jdwp transport dt socket server y suspend n address 5005    But it depends on how your run your application  If you re not sure which of the three applies to you  start with the first and go down the list until you find the one that works   You can change suspend n to suspend y to force your application to wait until you connect with IntelliJ before it starts up  This is helpful if the breakpoint you want to hit occurs on application startup   Debug  Start your application as you would normally  then in IntelliJ select the new configuration and hit  Debug      IntelliJ will connect to the JVM and initiate remote debugging   You can now debug the application by adding breakpoints to your code where desired  The output of the application will still appear wherever it did before  but your breakpoints will hit in IntelliJ

User · Answer

Also  don t forget you need to add  -Xdebug  flag in app JAVA OPTS if you want connect in debug mode

User · Answer

in AndroidStudio or idea   Config the application will be debug  open Edit Configurations   add  VM Options  Config     -agentlib jdwp transport dt socket server y suspend n address 5005     remember  address      Config Remote Debugger if not exits  Click   to add   specify   Port  same as in Step 1  address

User · Answer

Also I use Tomcat GUI app  in my case  C  tomcat bin Tomcat9w bin     Go to Java tab    Set your Java properties  for example   Java virtual machine      C  Program Files Java jre-10 0 2 bin server jvm dll   Java virtual machine      C  tomcat bin bootstrap jar C  tomcat bin tomcat-juli jar   Java Options       -Dcatalina home C  tomcat      -Dcatalina base C  tomcat      -Djava io tmpdir C  tomcat temp      -Djava util logging config file C  tomcat conf logging properties      -agentlib jdwp transport dt socket server y suspend n address   8000   Java 9 options      --add-opens java base java lang ALL-UNNAMED      --add-opens java base java io ALL-UNNAMED      --add-opens java rmi sun rmi transport ALL-UNNAMED

[debugging] Attach IntelliJ IDEA debugger to a running Java process

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