8080 port already taken issue when trying to redeploy project from Spring Tool Suite IDE

Question

I have strange thing when I try to modify Spring project inside my Spring Tool Suite  On the first load  deploy  everything is fine  application compiles and runs on localhost 8080   When I change something inside code and try to redeploy it  Run it again - Run As Spring Boot App  I get error message                                 APPLICATION FAILED TO START            Description       The Tomcat connector configured to listen on port 8080 failed to   start  The port may already be in use or the connector may be   misconfigured       Action       Verify the connector s configuration  identify and stop any process   that s listening on port 8080  or configure this application to listen   on another port       2016-10-19 00 01 22 615  INFO 10988 ---             main    ationConfigEmbeddedWebApplicationContext   Closing   org springframework boot context embedded AnnotationConfigEmbeddedWebApplicationContext 3023df74    startup date  Wed Oct 19 00 01 19 CEST 2016   root of context   hierarchy 2016-10-19 00 01 22 616  INFO 10988 ---             main    o s j e a AnnotationMBeanExporter          Unregistering JMX-exposed   beans on shutdown   If I shutdown process on that port manually everything works fine again  but this can t be right way of redeploying Spring app  Am I doing something wrong here   I m using    Spring Boot     v1 4 1 RELEASE   P S  I m aware that I can setup some kind of hot-swap mechanism to have automatic reload of page after I change code  but for now I would like to resolve this issue first   Thanks for any kind of help or info

User · Answer

In Spring Boot Application  Using Spring Starter Project  We Have Update Port in Server xml using Tomcat server and Add this port in application property  insrc main resources  the code is  server port 8085  And update Maven Project then run application

User · Answer

There are two ways to resolve this issue Try option 1 first  if it doesn t work try option 2  and your problem is solved   1  On the top right corner of your console  there is a red button  to stop the spring boot application which is already running on this port just click on the red button to terminate   2  If the red button is not activated you need to right click on the console and select terminate disconnect all  Hope this helps   Bonus tip - If you want to run your server on a different port of your choice  create a file named application properties in resource folder of your maven project and write server port 3000 to run your application on port 3000

User · Answer

No Need to  manually start  an application every time at time of development to implements changes use  spring-boot-devtool  maven dependency      Automatic Restart      To use the module you simply need to add it as a dependency in your Maven POM     lt dependency gt           lt groupId gt org springframework boot lt  groupId gt           lt artifactId gt spring-boot-devtools lt  artifactId gt       lt  dependency gt    When you have the spring-boot-devtools module included  any classpath file changes will automatically trigger an application restart  We do some tricks to try and keep restarts fast  so for many microservice style applications this technique might be good enough

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On Linux Machine  save the bash script and execute it  If you want to free port 8080  Input 8080 when prompted   echo  Enter port number to be closed      read port sudo kill   sudo lsof -t -i  port

User · Answer

Create application properties file under src main resources folder and write content as      server port 8084   Its runs fine  But every time before run need to stop application first by click on red button upper on the IDE   or try      RightClick on console click terminate Disconnect All

User · Answer

There are some processes left in the background on that port  several reasons can cause this problem  but you can solve easily if you end process which is related to 8080 or Spring   If you are using Linux there is steps how to end process    Open terminal and type command  htop  press key F3 it will allow you to search  Type  8080  if there was no result on 8080 after that try  spring  Then Press F9 KILL  And press  9  SIGKILL    this will kill process which is left on 8080 port and let you run application

User · Answer

If you are using linux system  use the below command   fuser -k some port number tcp  - that will kill that process   Sample -  fuser -k 8080 tcp  Second Option  Configure the tomcat to use a new port

User · Answer

You have to stop the current process and run your new one  In Eclipse  you can press this button to ReLaunch your application

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Goto Window- gt Preferences  search for Launching  Select the  quot Terminate and Relaunch while launching quot  option  Press Apply

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Print the list of running processes and try to find the one that says spring in it  Once you find the appropriate process ID  PID   stop the given process   ps aux   grep spring kill -9 INSERT PID HERE   After that  try and run the application again  If you killed the correct process your port should be freed up and you can start the server again

User · Answer

One simple solution for me that worked was to   - Restart the IDE  since the stop Button was no longer visible

User · Answer

hi creating a simple line in application properties as SERVER PORT 8090 solved the issue

User · Answer

Am I doing something wrong here    Yes  you are  One servlet container is already running on port 8080 and you are trying to run another one on port 8080 again   Either restart the server  If there is button for that in STS  or stop and start it

User · Answer

In my case  the error occurred as the application was unable to access the keystore for ssl   Starting the application as root user fixed the issue

User · Answer

Open  localhost 8080  on your browser and see what is running on this port  I did it and I just found Oracle 10g XE running on background  so I went to start- Services and stopped all oracle services  Then I redo mvnw spring-boot run on IntelliJ and it runs like magic

User · Answer

For Mac users OS X El Capitan   You need to kill the port that localhost 8080 is running on  To do this  you need to do two commands in the terminal  N sudo lsof -i tcp 8080  kill -15 PID   NB  PID IS A NUMBER PROVIDED BY THE FIRST COMMAND  The first command gives you the PID for the localhost 8080  Replace the PID in the second command with the PID that the first command gives you to kill the process running on localhost 8080

User · Answer

It sometimes happen even when we stop running processes in IDE with help of Red button   we continue to get same error   It was resolved with following steps    Check what processes are running at available ports  netstat -ao  find  i  listening   We get following  TCP    0 0 0 0 7981           machinename 0        LISTENING       2428 TCP    0 0 0 0 7982           machinename 0        LISTENING       2428 TCP    0 0 0 0 8080           machinename 0        LISTENING       12704 TCP    0 0 0 0 8500           machinename 0        LISTENING       2428  i e  Port Numbers and what Process Id  they are listening to Stop process running at your port number In this case it is 8080  amp  Process Id is 12704   Taskkill  F  IM 12704  Note  Mention correct Process Id    For more information follow these links Link1 and Link2   My Issue was resolved with this  Hope this helps

User · Answer

The reason is one servlet container is already running on port 8080 and you are trying to run another one on port 8080     Check what processes are running at available ports    For Windows   netstat -ao  find  i  listening     OR   netstat -ano   find  8080   Note  8080 is port fail to start      Now try to reLaunch or stop your application    To relaunch  you can press this button       To stop in windows    Taskkill  F  IM 6592 Note  Mention correct Process Id    right click on the console and select terminate disconnect all   Go to Task Manager and end Java tm  platform se binary     What is java tm  platform se binary Search in google   Another option is    Go to application properties file set server port 0  This will cause Spring Boot to use a random free port every time it starts

User · Answer

If you got any error on your console by saying     Embedded servlet container failed to start  Port 8080 was already in use     Then go to application properties file and add this property    server port   8090      Actually the default port for spring boot is 8080  if you have something else on that port  the above error will occur  So we are asking spring boot to run on other port by adding    server port   8090    in application properties file

User · Answer

Just click red button to stop all services on eclipse than re- run application as Spring Boot Application - This worked for me

User · Answer

This is a typical startup failure due to the embedded servlet container   s port being in use    Your embedded tomcat container failed to start because Port 8080 was already in use   Just Identify and stop the process that s listening on port 8080 or configure  in you application properties file  this application to listen on another port

User · Answer

You can use list open file command and then kill the process like below  sudo lsof -t -i tcp 8181   xargs kill -9  or sudo lsof -i tcp 8181  kill -9 PID

[java] 8080 port already taken issue when trying to redeploy project from Spring Tool Suite IDE

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