Tomcat Server Error - Port 8080 already in use

Question

I received the following error while attempting to execute a Servlet program in Eclipse Mars EE        Starting Tomcat v8 0 Sever at localhost  has encountered a problem       Port 8080 required by Tomcat v8 0 Server at localhost is already in   use  There may already be running in another process  or a system   process may be using the port  To start this server you will need to   stop the other process or change the port number s     What should I do to stop the process  I m assuming that Tomcat 7 server must be stopped  How shall I do it if my operating system is Windows 8   Error Screenshot

User · Answer

You can solve this in two steps   STEP 1  Open the Command prompt and type netstat -a -o -f and press enter  the above command will show all the processes running on your machine  https   i stack imgur com m66JN png  STEP 2  Type TASKILL  F  PID 4036  where F stands for force and PID stands for parent Id and 4036 stands for process id of 8080  here I am using some random number  https   i stack imgur com Co5Tg png  Few times when you are trying to kill process it will throw an exception telling that access is denied as shown in the above screenshot  at that point of time you are supposed to open command prompt as run as administrator  https   i stack imgur com JwZTv png  Then come back to eclipse clean the project and then try to run the project

User · Answer

To get rid of this error just click on server tab on eclipse   You will get list of servers as below image  In my case it was tomcat 8 only     Double click on the respective server  You will get screen as shown below  -    Now change Conflicting port number  In my case I changed 8080 to 8081  highlighted portion   Save it  ctrl s  and hence you can start your server now

User · Answer

netstat -ano   findstr 8080 taskkill  pid 21424  F   execute the above command in command prompt first command will find the pid of the processes which are using port 8080 or any other port you are using  And in second command write the pid of instead of 21424

User · Answer

I have encountered this issue many times  If port 8080 is already in use that means there is any Process   or it child process  which is using this port Two Way to Solve this issue   Change the Port number and this issue will be solved   We will find the PID i e Process Id and then we will kill the process of child process which is using this Port    Find PID Process ID  every process has unique PID  c user gt user name gt netstat -o -n -a   findstr 0 0 8080  Now we need to kill this process cmd - gt Run as Admin C  Windows system32 gt taskkill  F  T  PID 2160  quot taskkill  F  T  PID 2160 quot    - gt   quot 2160 quot  is the process ID Now your server can use this port 8080

User · Answer

Open below application  C  Users  username  AppData Roaming Microsoft Windows Start Menu Programs Apache Tomcat 8 5 Tomcat8  right click on Apache tomcat in system tray and click on stop services  Run your application from eclipse   http   siddartech com apache apachi-tomcat-server-already-in-use

User · Answer

Since it is easy to tackle with Command Prompt  Open the CMD and type following   netstat -aon   find  8080    If a process uses above port  it should return something output like this   TCP    xxx xx xx xx 8080      xx xx xx xxx 443      ESTABLISHED     2222   The last column value  2222  is referred to the Process ID  PID    Just KILL it as follows   taskkill  F  PID 2222   Now you can start your server

User · Answer

you can stop using the shutdown bat inside tomcat installation directory  Or you may click  stop  button at the servers view of eclipse  To get to the view select Window - Show View - Servers

User · Answer

You ve another instance of Tomcat already running  You can confirm this by going to http   localhost 8080 in your webbrowser and check if you get the Tomcat default home page or a Tomcat-specific 404 error page  Both are equally valid evidence that Tomcat runs fine  if it didn t  then you would have gotten a browser specific HTTP connection timeout error message   You need to shutdown it  Go to  bin subfolder of the Tomcat installation folder and execute the shutdown bat  Windows  or shutdown sh  Unix  script   for more help please chech this answer

User · Answer

If you want to regain the 8080 port number you do so by opening the task manager and then process tab  right click java exe process and click on end process as shown in image attached

User · Answer

For Ubuntu Linux  Step 1  Find the process id that is using the port 8080  netstat -lnp   grep 8080 or ps -aef   grep tomcat   Step 2  Kill the process using process id in above result  kill -9 process id   For Windows  Step 1  Find the process id  netstat -ano   findstr 8080   Step 2  Open command prompt as administrator and kill the process  taskkill  F  pid 1088   In my case port 8005 was already in use so I used the same above steps

User · Answer

Open CMD or Powershell in Administrator mode  then run     netstat -ab   The output should be able to point you in the direction of which process is holding port 8080  Entry may likely be 127 0 0 1 8080 You may still have a running instance of Tomcat at port 8080   You can either use Stop-Process in PowerShell or taskKill in CMD to stop that process and should be able to execute the program at that point

User · Answer

In case of MAC users  go to Terminal and do the following  lsof -i  8080   returns the PID  process id  that runs on port 8080 kill 1234   kill the process using PID  used dummy PID here  lsof -i  8443 kill 4321   8080 is HTTP port and 8443 is HTTPS port  by default

User · Answer

Solution You can use the troubleshooting tips below  Troubleshooting Tip  1  Exit Eclipse  Open a web browser and visit  http   localhost 8080  If you see a  quot Tomcat quot  web page then that means Tomcat is running as a Windows service  To stop Tomcat running as a Windows services  open your Windows Control Panel  Find the service  quot Apache Tomcat quot  and stop it   If you don t see a  quot Tomcat quot  web page  then stop the appropriate process displayed    -- Troubleshooting Tip  2 - GUI Option Steps to free port which is already used to run Tomcat server in Eclipse  On MS Windows  select Start  gt  All Programs   gt  Accessories  gt  System Tools  gt Resource Monitor  Expand the Network Tab  Move to the section for Listening Ports  Look in the Port column and scroll to find entry for port 8080  Select the given process and delete kill the process  Return back to Eclipse and start the Tomcat Server  it should start up now     Troubleshooting Tip  3 - Command-Line Option Steps to free port which is already used to run Tomcat server in Eclipse For example   suppose 8080 port is used   we need to make free 8080 to run tomcat Step 1   open the CMD command  C  Users username gt netstat -o -n -a   findstr 0 0 8080 TCP    0 0 0 0 3000      0 0 0 0 0              LISTENING       3116 Now   we can see that LISTENING port is 3116 for 8080   We need to kill 3116 now Step 2  C  Users username gt taskkill  F  PID 3116 Step 3   Return back to Eclipse and start the Tomcat Server  it should start up now       Mac Linux SOLUTION Step 0  Exit Eclipse Step 1  Open a terminal window Step 2  Enter the following command to find the process id lsof -i  8080 This will give output of the application that is running on port 8080 Step 3  Enter the following command to kill the process kill   lsof -t -i  8080  Step 4   Return back to Eclipse and start the Tomcat Server  it should start up now

User · Answer

I would suggest to end java exe or javaw exe process from task manager and try again  This will not end the entire eclipse application but will free the port

User · Answer

The thing here is - You have already another tomcat running on port 8080  you need to shut it down  You can do it in several ways  let me tell you 2 simplest ways   Either go to the location where tomcat is installed  go to din directory and execute the shutdown bat or shutdown sh   OR   if you are in windows  go to bottom right notification panel of your screen  click on up arrow to see more running services  you will find tomcat here  right click on it and select shutdown    that it

User · Answer

The Way I solved this problem is   Install TCPview go to TCP view and check what ports is Tomcat utilizing there will be few other ports other than 8005 8009 8080 now go to Servers tab in eclipse double click on Tomcatv9 0 server and change port numbers there  This will solve the problem

User · Answer

All I had to do was to change the port numbers      Open Eclipse Go to Servers panel Right click on Tomcat Server select Open  Overview window will appear  Open the Portstab  You will get the following    Tomcat adminport HTTP 1 1 AJP 1 3  I changed the port number of HTTP 1 1  i e  to 8081  You might have to also change the port of Tomcat adminport  i e  to 8006  and of AJP 1 3  i e  to 8010   Access your app in the browser at http   localhost 8081

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For Ubuntu users with the same problem  e g  Eclipse crash during debug  do a netstat -a -p   grep 8095  or any other port number if the Tomcat server   then kill -9 that process

User · Answer

You can stop the running tomcat server by doing the following steps   Step 1  go to your tomcat installation path   bin  in your Windows system   Step 2  open cmd for that bin directory  you can easily do this by typing  cmd  at that directory    Step 3  Run  Tomcat7 exe stop   This will stop all running instances of tomcat server and now you can start server from your eclipse IDE

[java] Tomcat Server Error - Port 8080 already in use

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