Unable to open debugger port in IntelliJ

Question

Unable to open debugger port in intellij. The port number 9009 matches the one which has been set in the configuration file for the application.

<java-config debug-options="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=9009" system-classpath="" native-library-path-prefix="D:\Project\lib\windows\64bit" classpath-suffix="">
    <jvm-options>-XX:MaxPermSize=192m</jvm-options>
    <jvm-options>-client</jvm-options>
    <jvm-options>-XX:+UnlockDiagnosticVMOptions</jvm-options>
    <jvm-options>-XX:+LogVMOutput</jvm-options>
    <jvm-options>-XX:LogFile=${com.sun.aas.instanceRoot}/logs/jvm.log</jvm-options>
    <jvm-options>-Djava.endorsed.dirs=${com.sun.aas.installRoot}/modules/endorsed${path.separator}${com.sun.aas.installRoot}/lib/endorsed</jvm-options>
    <jvm-options>-Djava.security.policy=${com.sun.aas.instanceRoot}/config/server.policy</jvm-options>
    <jvm-options>-Djava.security.auth.login.config=${com.sun.aas.instanceRoot}/config/login.conf</jvm-options>
    <jvm-options>-Dcom.sun.enterprise.security.httpsOutboundKeyAlias=s1as</jvm-options>
    <jvm-options>-Djavax.net.ssl.keyStore=${com.sun.aas.instanceRoot}/config/keystore.jks</jvm-options>
    <jvm-options>-Djavax.net.ssl.trustStore=${com.sun.aas.instanceRoot}/config/cacerts.jks</jvm-options>
    <jvm-options>-Djava.ext.dirs=${com.sun.aas.javaRoot}/lib/ext${path.separator}${com.sun.aas.javaRoot}/jre/lib/ext${path.separator}${com.sun.aas.instanceRoot}/lib/ext</jvm-options>
    <jvm-options>-Djdbc.drivers=org.apache.derby.jdbc.ClientDriver</jvm-options>
    <jvm-options>-DANTLR_USE_DIRECT_CLASS_LOADING=true</jvm-options>
    <jvm-options>-Dcom.sun.enterprise.config.config_environment_factory_class=com.sun.enterprise.config.serverbeans.AppserverConfigEnvironmentFactory</jvm-options>
    <jvm-options>-Dosgi.shell.telnet.port=4766</jvm-options>
    <jvm-options>-Dosgi.shell.telnet.maxconn=1</jvm-options>
    <jvm-options>-Dosgi.shell.telnet.ip=127.0.0.1</jvm-options>
    <jvm-options>-Dfelix.fileinstall.dir=${com.sun.aas.installRoot}/modules/autostart/</jvm-options>
    <jvm-options>-Dfelix.fileinstall.poll=5000</jvm-options>
    <jvm-options>-Dfelix.fileinstall.debug=1</jvm-options>
    <jvm-options>-Dfelix.fileinstall.bundles.new.start=true</jvm-options>
    <jvm-options>-Dorg.glassfish.web.rfc2109_cookie_names_enforced=false</jvm-options>
    <jvm-options>-XX:NewRatio=2</jvm-options>
    <jvm-options>-Xmx2048m</jvm-options>
  </java-config>

Configuration in IntelliJ:

When I try and enable the remote debugging in for this application it comes up with the following error:

Answer 1

Changing the debugger port works for me. screenshot of tomcat config

Answer 2

I know its an old thread but I am using tomcat with spring boot and none of above worked for me. As of Oct, 2023, Intellij Community Edition suggests following command line arguments for JVM

-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005

However, when I run my application with following command:

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005 -jar myApp.jar --spring.profiles.active=local

I didn't get the following line

Listening for transport dt_socket at address: 5005

With help of this answer https://stackoverflow.com/a/43800535/3369001, I changed it to

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005 -jar myApp.jar --spring.profiles.active=local

Instead of address=*:5005, use address=5005.

That's it!

Answer 3

I change the port from 6xxxxx to 2xxxxx and it works now.

Answer 4

In my case, I was not setting the debug port while starting the application. I am using tomcat to deploy 3 war files, and I forgot to configure the debug port.

Tomcat allows us to configure this via setenv.sh.

Here are the commands to create setenv.sh file in the bin directory of my tomcat installation and provide the debug arguments/port.

tee /usr/share/tomcat9/bin/setenv.sh << EOF
export CATALINA_OPTS="$CATALINA_OPTS -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005"
EOF

service tomcat9 restart

Answer 5

1. In glassfish\domains\domain1\config\domain.xml set before start server

<java-config classpath-suffix="" debug-options="-agentlib:jdwp=transport=dt_socket,address=9009,server=y,suspend=n" java-home="C:\Program Files\Java\jdk1.8.0_162" debug-enabled="true" system-classpath="">

or set debug-enabled="true" server=y,suspend=n in http://localhost:4848/common/index.jsf

2. In current Idea 2018 - Server Run Configuration - Debug - Port - address

Answer 6

Make sure to specify an SDK and Project SDK for your app under File --> Project Structure (Project | SDKs)

Answer 7

You may have to change the debugger port if your port is already used by another program. To do so:

• Run
• Edit Configurations
• Startup/Connection tab
• Debug
• Change the port here

---

Or, maybe in other versions:

• Run
• Edit Configurations
• Remote > Remote debug in the list on the left
• Configuration tab, Settings section
• Port: change the port here

Answer 8

Merely hitting the debug icon again fixed my problem in a few seconds.

Answer 9

I once have this problem too. My solution is to work around this problem by kill the application which is using the port. Here is a article to teach us how to check which application is using which port, find it and kill/close it.

Answer 10

I had the same issue, I just have to remove the HTTP protocol from the URL. That's it.

I hope it works for you.

Answer 11

Your Service/ Application might already be running. In Search enter Services and you will get list of services. Stop yours and then try again.

Answer 12

You must set CHMOD +x (execute for *.sh or *.bat files). For example, I am using macOS

cd /Users/donhuvy/Documents/tools/apache-tomcat-9.0.12/bin
sudo chmod +x *.sh

Then IntelliJ IDEA, and Apache Tomcat running or debugging just good.

Answer 13

This error can happen Tomcat is already running. So make sure Tomcat isn't running in the background if you've asked Intellij to start it up ( default ).

Also, check the full output window for more errors. As a more useful error may have preceded this one ( as was the case with my configuration just now )

Answer 14

Run your Spring Boot application with the given command to enable debugging on port 6006 while the server is up on port 8090:

mvn spring-boot:run -Drun.jvmArguments='-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=6006' -Dserver.port=8090

Answer 15

Set the MAVEN_OPTS. It should work !!

export MAVEN_OPTS="-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=4000,server=y,suspend=n"

mvn spring-boot:run -Dserver.port=8090

Answer 16

For me, the problem was that catalina.sh didnt have execute permissions. The "Unable to open debugger port in intellij" message appeared in Intellij, but it sort of masked the 'could not execute catalina.sh' error that appeared in the logs immediately prior.

Answer 17

Try to connect with telnet , if it connects then it shows below:

$telnet 10.238.136.165 9999 Trying 10.238.136.165... Connected to 10.238.136.165. Escape character is '^]'. Connection closed by foreign host.

If port is not available (either because someone else is already connected to it or the port is not open etc) then it shows something like it shows like below:

$telnet 10.238.136.165 9999 Trying 10.238.136.165... telnet: connect to address 10.238.136.165: Connection refused telnet: Unable to connect to remote host

So I think one needs to see whether:

• the application is property listening to port or not

• or someone else has already connected to it

Also try to connect on that m/c itself first like $telnet localhost 9999

Answer 18

Answer is pretty simple, I also faced the problem finally I got perfect solution. Create Debug Create Remote debug with following configuration Firstly run by debug. It gives you waitng for socket 5005 then run with remote debug

Answer 19

I had the same problem and this solution also did the trick for me: Provide the IP 127.0.0.1 in the Intellij Debug configuration instead of the host name "localhost", in case you're using this hostname.

Answer 20

This one worked for me-- If the issue still persists (in case you are not using a glassFish server), then close your JIdea and stop the server. This will disable the ports connectivity. Then start your server and JIdea, this will start fresh connectivity with the ports, resolving the issue.

Answer 21

I'm hoping your problem has been solved by now. If not, try this... It looks like you have server=y for both your app and IDEA. IDEA should probably be server=n. Also, the (IDEA) client should have an address that includes both the host name and the port, e.g., address=127.0.0.1:9009.

Answer 22

Add the following parameter debug-enabled="true" to this line in the glassfish configuration. Example:

<java-config  debug-options="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=9009" debug-enabled="true"
  system-classpath="" native-library-path-prefix="D:\Project\lib\windows\64bit" classpath-suffix="">

Start and stop the glassfish domain or service which was using this configuration.