Remote Debugging in IntelliJ Tomcat

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How to enable remote debugging from IntelliJ with Tomcat?

intellij-idea
9 Answers

TOMCAT Configuration Instructions

The process of getting remote debugging working involves two steps.

 1. Starting Tomcat with remote debugging enabled
 2. Having your IDE, in my case IntelliJ IDEA, to be able to debug the remote tomcat application.

There are couple of ways to get the first part done and it slightly differs depending on which OS environment your Tomcat instance is running on. But, regardless of the method used, the main idea behind the configuration remains the same; which is: pass specific start up options to the JVM that would enable remote debugging.

If you have Tomcat running as a windows service, then configuring Tomcat to start up with ability to be debugged remotely is done by simply specifying the start up arguments in the run properties.

Open up the Apache Tomcat properties dialog box :

Apache Tomcat/bin/tomcat9w.exe

and under the Java tab add the required start up option:

-agentlib:jdwp=transport=dt_socket,address=1043,server=y,suspend=n

enter image description here

Restart your server now.    
Close and go to your IDE.

Configuring IntelliJ IDEA

With the remote JVM running the Tomcat started with the required start up arguments, the next thing to do is to configure the debugger in IntelliJ IDEA.

Open the Edit Configuration settings and select the Remote option:

The Remote settings dialog box appears where you can specify the required configuration; remote host, port, project, etc...

enter image description here

Specify the required settings, click Ok to save changes, and start the debugging session. You should also see the notice that IntelliJ has successfully connected to the remote VM.

Once this is done, you should then open the source code of the application you have running on the remote Tomcat, put a breakpoint where required and you can go ahead and start debugging as if the application is running on your local machine.

user_92573550

In Intellij Idea:

  1. Click on Run -> Edit Configurations -> Add New Configurations ("+" icon)

  2. Click on Remote

  3. Set Host and Port

  4. Copy content of Command line arguments for running remote JVM, for example:

    -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8000

enter image description here

If you use Tomcat Service (for Tomcat 9):

  1. Go to %TOMCAT_INSTALL_DIR%/bin

  2. Run tomcat9w.exe

  3. Click on Java tab

  4. In Java Options Paste the copied text:

    -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8000

  5. Apply.

enter image description here

user_48137770

Step1 (How to start tomcat):

cd /C/SOFTWARE/apache-tomcat-8.5.38/bin 
JAVA_OPTS='-agentlib:jdwp=transport=dt_socket,address=54470,suspend=n,server=y' sh catalina.sh start
ps aux | grep java

Step 2 ( Attach Intellij with remote port ): 

Run/Debug Configurations
    Tab: Server:
       Application Server: Type "Tomcat 8.5.38"
       Open browser -> URL -> http://localhost:8080/
       Tomcat Server Settings -> Type -> Same File System
                              -> Host -> Same File System

       Remote Connection Settings
                           -> Host -> localhost
                           -> Port -> 8080

Startup/Connection Tab
       Run -> No specific parameters needed.
       Debug -> -agentlib:jdwp=transport=dt_socket,address=54470,suspend=n,server=y
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