Remote debugging Tomcat with Eclipse

Question

I can t seem to debug the tomcat application through Eclipse   I ve set   CATALINA OPTS -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n  and then I run bin catalina sh  where I see output saying it s listening for dt socket on port 8000   But whenever I try to connect to port 8000 in Eclipse  by adding an entry in the remote java application menu   it complains about a refused connect   Any ideas

User · Answer

Modify catalina bat to add   set JPDA OPTS  -agentlib jdwp transport dt socket address 8000 server y suspend n     and  CATALINA OPTS -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n   Optional  Add below line to run the debug mode by default when you run startup bat  call   EXECUTABLE   jpda start  CMD LINE ARGS    Eclipse or STS select debug configuration right click -  new  connection type - gt  Standard socket Attach Port - gt  8000  as given in the CATALINA OPTS  Host - gt  localhost or IP address

User · Answer

Just run   catalina sh jpda start  forks  or   catalina sh jpda run  does not fork  not mentioned in help   All options mentioned here default to sane values

User · Answer

Can you check if this works   JPDA OPTS  -agentlib jdwp transport dt socket address 8000 server y suspend n   catalina sh jpda start

User · Answer

Let me share the simple way to enable the remote debugging mode in tomcat7 with eclipse  Windows      Step 1  open bin startup bat file Step 2  add the below lines for debugging with JDPA option  it should starting line of the file         set JPDA ADDRESS 8000       set JPDA TRANSPORT dt socket     Step 3  in the same file    go to end of the file modify this line -       call   EXECUTABLE   jpda start  CMD LINE ARGS        instead of line       call   EXECUTABLE   start  CMD LINE ARGS      step 4  then just run bin startup bat   so now your tomcat server ran in remote mode with port 8000      step 5  after that lets connect your source project by eclipse IDE with remote client     step6  In the Eclipse IDE go to  debug Configuration     step7 click  remote java application  and on that click  New     step8  in the  connect  tab set the parameter value       project  your source project      connection Type  standard  socket attached        host  localhost      port 8000     step9  click apply and debug     so finally your eclipse remote client is connected with the running tomcat server  debug mode      Hope this approach might be help you     Regards

User · Answer

See this answer for issues I had with Java 8 and Tomcat 9   Java remote debugging  JPDA  not working for me in Tomcat 9  This is similar to  DAB s warning  and his solution is likely more secure

User · Answer

For apache-tomcat-8 5 28 version just do this   catalina bat jpda start   As the default settings already configured for us in catalina bat as     if not   JPDA OPTS         goto gotJpdaOpts set   JPDA OPTS -agentlib jdwp transport  JPDA TRANSPORT  address  JPDA ADDRESS  server y suspend  JPDA SUSPEND    So no need of any other config  And when you execute command   catalina bat jpda start  you can see debug port 8000 is opened

User · Answer

For apache-tomcat-8 5 28  modify JDPA OPTS like the below then run like catalina bat jpda start  JPDA OPTS  -agentlib jdwp transport  JPDA TRANSPORT address  JPDA ADDRESS server y suspend  JPDA SUSPEND  JPDA OPTS  -agentlib jdwp transport  JPDA TRANSPORT address 8000 server y suspend  JPDA SUSPEND

User · Answer

I was hitting this issue while running Tomcat inside of a Docker container   To fix this make sure you add the  -p 8000 8000  argument in your docker run command to expose this port to your local machine   You will of course need the setenv sh file in your   CATALINA HOME  bin  within your container as well

User · Answer

In tomcat 7  catalina sh has this code   if     1     jpda      then   if   -z   JPDA TRANSPORT     then     JPDA TRANSPORT  dt socket    fi   if   -z   JPDA ADDRESS     then     JPDA ADDRESS  8000    fi   if   -z   JPDA SUSPEND     then     JPDA SUSPEND  n    fi   if   -z   JPDA OPTS     then     JPDA OPTS  -agentlib jdwp transport  JPDA TRANSPORT address  JPDA ADDRESS server y suspend  JPDA SUSPEND    fi   CATALINA OPTS   CATALINA OPTS  JPDA OPTS    shift fi   Ii implies that you can setup JPDA with   export JPDA TRANSPORT dt socket export JPDA ADDRESS 8000 export JPDA SUSPEND n   Or with   JPDA OPTS  -agentlib jdwp transport dt socket address 8000 server y suspend n    And finally use   catalina sh jpda start  Regards

User · Answer

If still all the above doen t work you can always add to the script      set  JAVA OPTS -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n

User · Answer

Modifying the startup bat with the CATALINA OPTS AND JPDA OPTS didn t work for me but adding them to catalina bat did   Modify catalina bat   CATALINA OPTS  -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n   JPDA OPTS  -agentlib jdwp transport dt socket address 8000 server y suspend n    Modify startup bat to include jpda   change call   EXECUTABLE   start  CMD LINE ARGS  to  call   EXECUTABLE   jpda start  CMD LINE ARGS   Then configure remote java application in your debug configurations in Eclipse

User · Answer

In the tomcat bin directory wherecatalina bat or  sh is found  aka  CATALINA BASE  bin   edit  create if not there    setenv bat  sh   Add the following line   CATALINA OPTS  -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n    That s all you need to do  you don t need to edit the catalina bat  or  sh  file   See the comments in catalina bator catalina sh   You may have to adjust the syntax for your particular environment situation   For example  if you already have CATALINA OPTS defined  you might do something like this  in a windows environment    set CATALINA OPTS  CATALINA OPTS  -Xdebug -Xrunjdwp transport dt socket address 8088 server y suspend n   To debug from Eclipse   run- Debug configurations   - Remote Java Application- New  and specify a name  the project you are debugging  and the tomcat host and debug port specified above

User · Answer

Many of the above answers are correct  but remember that by default the debugger will listen on localhost  which means you can debug only if you re running the debugging client  for example  the IDE  on the same machine  If you are debugging a remote server you will need to specify the correct IP address on that server to listen on  for example  JPDA OPTS  quot -agentlib jdwp transport dt socket address 10 1 1 33 8000 server y suspend n quot  catalina sh jpda start  Note that the address is now 10 1 1 33 8000 Of course  you can also check which IP is actually being used  by running  netstat -an  This command is valid on both windows and Linux - you just need to filter out the port with find  Windows  or grep  Linux

User · Answer

First of all  if you open catalina bat with text editor  you see that   Do not set the variables in this script       So never change it in that script  instead you can do below steps    It advices you to create a new bat file with name  setenv bat    Then set 2 variables in that bat file such as   set CATALINA OPTS  -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n   set JPDA OPTS  -agentlib jdwp transport dt socket address 8000 server y suspend n  Lastly run that at cmd that   catalina bat jpda start  In IDE  create remote debug configuration and set host to related server ip and port to 8000

User · Answer

I spent some time on this to get the right information   So here is the detailed information step by step   Environment   Windows 7  TomCat version   7 0  IDE   Eclipse  Configurations to be added for enabling remote debugging with in tomcat is  -Xdebug -agentlib jdwp transport dt socket address 8000 server y suspend n   I don t recommend above configuration fro non windows environment  To add the above configuration double click on tomcat server which will be available in server view  Find the below screen shot    Now add the above runtime environment configuration to tomcat  For this check below screenshot     Now got to Arugments tab in Edit launch configuration properties as show in below screen shot     GoTo VM arguments section add these lines      -Xdebug      -agentlib jdwp transport dt socket address 8000 server y suspend n     Now got to debug button available on eclipse toolbar     In Debug configurations find  Remote Java Application  and double click on it   In Name field enter any name which you like to   From project field using browse button select the project which you want to perform remote debug   The hostname is nothing but the host address  Here i m working locally so it is  localhost    Last the Port column the value should be 8000  Apart from Name and Project text fields other two columns Host and port will be filled by eclipse itself if not make you have same values as mentioned  Check Screen shot for info   Now right click on TomcatServer in server console select Add and Remove from context menu  From this dialog you can add the project to server   Now run the Tomcat sever     Now run the TomCatDebugConfiguration from Debug Tool   Last open internal or external browser and run your project  If the execution control reached the break points then the eclipse will prompt for debug perspective

User · Answer

In catalina bat file please modify the below    Step 1  CATALINA OPTS  -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n  Step 2  JPDA OPTS  -agentlib jdwp transport dt socket address 8000 server y suspend n  Step 3  Run Tomcat from command prompt like below  catalina sh jpda start Step 4  Then in the eclipse create a debug configuration   Give any name for configuration  Give the project name  Give the connection type as Standard Socket Attach  host as localhost port as 8000  or any port number   but that should be same in other places also

[eclipse] Remote debugging Tomcat with Eclipse

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