I supply my customers with my Tomcat webapp, which is configured to listen on port 80 and runs on their Windows PCs.
In some of their deployments, Microsoft's World Wide Web Publishing Service is already running unintentionally, which also listens on port 80. Thus when Tomcat and my webapp is launched, an Address already in use: JVM_Bind exception message is logged to the console, however it is scrolled off the screen by later startup messages and is thus unnoticed.
My Question: Is there some way to either
Configure the Tomcat server to stop under such circumstances, or
Code my webapp to detect this and stop? If my webapp could detect this, I would then log a message about what steps the user should take to kill the other program. Hopefully the message would remain visible on the console and not scroll off the screen.
netstat -a -o -n | findstr 0.0:80
taskkill /F /PID *pid*
While I have user documentation describing the problem and remedy, it's not usually handy. My thinking is that if this were the last message on the console, it may reduce the support call time.
Your application will start to be deployed into servlet container after IO (Http/Ajp connectors) is already started, so there is no way how you can do this from web application.
You can however wrap Tomcat startup script with batch file which will do that for you (and print meaningful error message, then wait for user to press enter).
Related
I'm looking for a way to deploy my Play-Framework-1.0 application on the port 80.
So first I made the zip file with 'dist' command, then I unzipped it.
When I run the command to lauch the application (play-java-1.0-SNAPSHOT/bin/play-java -Dhttp.port=80 -Dhttp.adresse=127.0.0.1), I get this error :
[error] p.c.s.NettyServer - Failed to listen for HTTP on /0.0.0.0:80!
Oops, cannot start the server.
play.core.server.ServerListenException: Failed to listen for HTTP on /0.0.0.0:80!
at play.core.server.NettyServer.play$core$server$NettyServer$$bindChannel(NettyServer.scala:215)
at play.core.server.NettyServer$$anonfun$1.apply(NettyServer.scala:203)
at play.core.server.NettyServer$$anonfun$1.apply(NettyServer.scala:203)
at scala.Option.map(Option.scala:146)
at play.core.server.NettyServer.<init>(NettyServer.scala:203)
at play.core.server.NettyServerProvider.createServer(NettyServer.scala:266)
at play.core.server.NettyServerProvider.createServer(NettyServer.scala:265)
at play.core.server.ServerProvider$class.createServer(ServerProvider.scala:25)
at play.core.server.NettyServerProvider.createServer(NettyServer.scala:265)
at play.core.server.ProdServerStart$.start(ProdServerStart.scala:53)
at play.core.server.ProdServerStart$.main(ProdServerStart.scala:22)
at play.core.server.ProdServerStart.main(ProdServerStart.scala)
Moreover, in the real server, Apache has been installed. So I wonder, whether that will be a problem.
Thanks!
Optionally, also remember that on most systems, running processes on ports lower than 8000 is disabled in default, in such case you need to allow it, i.e. on Unix servers, just using sudo command(prefix).
If you are using a Linux server, you can try 'fuser 80/tcp' to see whether another process is already running on that port (80). If so (there's showing a process-id, when you enter the command), you cannot use the same port for 2 processes.
Either, you have to start the Play-app in a different port or you can kill the already running process by 'sudo fuser -k 80/tcp' and start the Play-app on the same port (80).
It's not possible to have two processes running on the same host listening on the same port.
However, you could run you Play application on different port, e.g. 8080 and set up Apache as a reverse proxy (Nginx would do too, but you mentioned that you already have Apache running on the server) to forward requests to your Play application.
Example guide how to do that:
https://www.digitalocean.com/community/tutorials/how-to-use-apache-http-server-as-reverse-proxy-using-mod_proxy-extension
We have implemented embedded tomcat model java application. and running war file from java -jar command. the problem is how can i stop the server. and before server getting stopped, already fired requests to the server should get processed. then only i have to stop server. how can i implement this. thanks in advance.
Make your application when it is finished write to file /somedir/yoursecretfile
If using linux, make a cron job which check periodically if file /somedir/yoursecretfile exist and if the file exists, stops a web server (maybe with ps | grep | xargs or something like that).
If using other OS, use replacement for cron for that OS and script which stops a webserver.
I am trying to start Tomcat from Eclipse, but a problem occured:
Port 8080 required by Tomcat v6.0 Server at localhost is already in use. The server 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).
I tried to list processes connected to this port using command on Windows:
netstat -aon
But on the listing there is no process with PID = 8080. I also tried:
netstat -aon | find "8080"
But it also didn't find anything. Can anyone help me?
PID is the process ID - not the port number. You need to look for an entry with ":8080" at the end of the address/port part (the second column). Then you can look at the PID and use Task Manager to work out which process is involved... or run netstat -abn which will show the process names (but must be run under an administrator account).
Having said that, I would expect the find "8080" to find it...
Another thing to do is just visit http://localhost:8080 - on that port, chances are it's a web server of some description.
Open eclipse go to Servers panel, right click or press F3 to open Overview window and go to Ports (Modify the server ports). You will get the following:
tomcat adminport
HTTP/1.1
AJP/1.3
You can change the port numbers (e.g. HTTP/1.1 port number 8080 to 8082).
In windows " wmic process where processid="pid of the process running" get commandline " worked for me. The
culprit was wrapper.exe process of webhuddle jboss soft.
If no other process is using the port 8080, Eventhough eclipse shows the port 8080 is used while starting the server in eclipse, first you have to stop the server by hitting the stop button in "Configure Tomcat"(which you can find in your start menu under tomcat folder), then try to start the server in eclipse then it will be started.
If any other process is using the port 8080 and as well as you no need to disturb it. then you can change the port.
In my case, there was a conflict with the virtualization function of Windows 10. This problem occurred after installing Hyper-V, virtual machine platform, and hypervisor platform to use hyper-v, docker, and bluestack together.
Even if I check with netstat, it is not a port in use, and even if I restart Windows and change the port, it does not start up saying that it is in use for all ports.
So, by changing the following services to Disabled in Windows Services, the Tomcat problem was solved, but bluestack, docker, etc. execution became impossible.
After starting Tomcat, when I manually changed the services again, bluestack was executed.
Hyper-V Host Compute Service
HV Host Service
Host network service
Network virtualization service
I need to debug a web application for Tomcat6 in IntelliJ IDEA.
When I try to run my web application, I get two errors:
Address localhost:1099 is already in use
Unable to open debugger port: java.net.SocketException
Launching the Apache Tomcat 6 service manually works fine.
What should I do in order to be able to debug web applications in Apache Tomcat 6 from Intellij IDEA?
Following the below steps work:-
Open command prompt and type the command netstat -ano
You will see a list of active TCP connections with PID as the last column
See the second column listing the local addresses and find the one using port 1099 from it and you'll get its PID
Now open your Task Manager, click the Process tab and get the PID column to display [either by right clicking on the heading row and selecting PID OR click View, and then click Select Columns and select PID.]
Now find the PID we got from Step3 and end the process.
Now you are good to go :)
I face this issue all the time. Here's how to fix it
LINUX
Open a terminal instance.
fuser 1099/tcp
This should return you a process ID.
1099/tcp: 31596
where 31596 is the process ID. Now you can either use the process ID to kill it or just bash the following -
fuser -k 1099/tcp
WINDOWS
Open a command prompt instance.
netstat -aon | find "1099"
This will return you an instance of the process.
output:
TCP 0.0.0.0:1099 0.0.0.0:0 LISTENING 15776
Here 15776 is the process ID. To kill this, enter -
taskkill /F /PID 15776
Cheers!
You can change the JMX port (1099 per default) in the Run/Debug Configuration dialog. Just try a different port number (i.e. 9099).
If you had the web application up and running before, there may be an old debug server that did not close down properly running in the background. See this post about how to find what process that uses port 1099. If it proves to be a java process, kill it.
How can you find out which process is listening on a port on Windows?
(If you use the GUI sw suggested in the link above, you may kill the process(es) by marking all java processes that uses port 1099, right click and press "End Process...")
As said before, there's an old debug server running in the background.
My solution was to close the Java process that was left open from the Windows Task Manager.
Please verify that you can close this process before doing so!
Change your http port to 8080(default for tomcat) and debug port to something that is not being used currently by any processes. You can use anything that is upwards of 1024, but since you are getting an error on 1099, try something that is greater that 6000.
Debugger setting can be found here
There might be other program or server running at the background. First close other server running in the background and then restart your server.
I found this answer helpful:
How can you find out which process is listening on a port on Windows?
I opened the resource monitor and looked for what was using the ports. Then opened task manager and ended those processes
What worked for me was. I assumed I would need to have the "Apache Tomcat" service running under "Services" [Windows + R >> services.msc]
I went and stopped the Tomcat service here. Then I came to my Java application and ran it in Intellij, which allowed me to run it.
Hope this helps!
Just close all other unnecessary servers while using InteliJ.
I stopped my WAMP in order to remove this error "Port is already in use".
I use eclipse for java EE as my IDE and tomcat as my server. Here's the problem:
Several ports (8080, 8009) required by Tomcat v5.5 Server at localhost are already in use. The server 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.
It is as the exception says - you have a running instance of Tomcat (or, less likely, something else), that's taking ports 8080 and/or 8009. What to do:
if you've started tomcat, find it and stop it: using /etc/init.d/tomcat stop, or administrative tools > services > apache tomcat > stop, or shutdown.sh / shutdown.bat
if it is not you, find the process of tomcat and kill it (task manager on windows, and something like ps ux on nix)
if you don't find it, reboot
It looks like you have a Tomcat running already. It is possible that Eclipse couldn't stop Tomcat and now that it tries to run it again, it can't. Find and kill the existing process or reboot.
Issue the tasklist command in command prompt.
It should display tomcat as one of the processes. You can kill it by issuing either taskkill /IM "image_name" or taskkill /PID "process_id"
Others have mentioned that you could try and track down what's using those ports (perhaps another instance of Tomcat?), and kill it. However it might be that Windows itself is using them.
Killing the rogue program, or rebooting, might cure the problem for now, but to prevent this happening again, you need to reserve the ports you need. KB812873 explains how to do this.
Disclaimer: This KB article is for Windows Server 2003 and Windows 2000, and it's a while since I had to do this (for a few Windows Server 2003 installations). However I imagine it's the same for Windows 7. If not, someone will correct me :-)
Several ports (8080, 8009) required by Tomcat v5.5 Server at localhost are already in use.
You are not required to run Tomcat on 8080 or 8009. I am using Eclipse 8.6. I have set my Tomcat port to 8086 for eg.
Here are the steps to do it:
Stop Tomcat.
Click on the Run/Stop/Restart dropdown button
Select MyEclipse Tomcat
Click Configure Connector
Change port to whichever one you think is free.
To make sure you see these options make sure you have the latest version of MyEclipse.