I am very new to programming and setting up Java Servers. Actually its my first time to try it but not successful. I am about to test my first web app in Java but whenever I click the "Start server in debug mode" button in Eclipse I am always having error about my Tomcat server saying that port 8080 is being used. I wanna know how am I gonna check it in the console and close it if possible. Do you know other ways on dealing with this??? I also tried netstat but can't find the port 8080 among the list. Please help me out because I am really getting frustrated. I a tried whatever solution I find in google but still having the same problem. If you can explain to me what's going on that would be very helpful. Thanks in advance.
Use the following command:
netstat -an | find ":8080"
to check whether the port 8080 is open.
try using the following command: \> netstat -a
Related
I'm getting this error : Error running 'Tomcat': Address localhost:1099 is already in use
Screenshot from Intellj IDEA :
I tried to solve it by looking at the postings people posted in the face of a problem similar to mine, but I think it's a different matter from mine.
Once in my situation, there is no 'process using 1099 port'.
There is no return value when I type netstat -aon | find "1099" on cmd.
I've shut down the whole IntelliJ process and rebooted PC. I don't seem to use port 1099 at all, but there's an error like that.
Change the current port number to some other port in server.xml of tomcat.
For example : change it to 1100.
<Connector port="1100" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
Restart the server.
Hi I'm not good at English, but I'll do my best to translate at google
I was meet that problem and I was solve that problem at 2021-01-10.
U use netstat command in window OS right?? If you are having this problem on Windows OS
Find the Hyper-V program and disable it. because Port 1099 is referred to as a program reserved for MS Hyper-V. So, if you use the hyper-v program let's find hyper-v program and make shut off. It will be a tomcat start
if u don't know how to disable hyper-v program i give MS link for u
https://learn.microsoft.com/en-us/virtualization/hyper-v-on-windows/quick-start/enable-hyper-v#enable-the-hyper-v-role-through-settings
have a nice study?? or Develope
Something is using that port and you need to kill the process that's using that port. You can try to go to your Task Manager and find the process that runs TomcatServer and kill it and as far as I know, there should also be a Tomcat Manager that let's you kill the current process.
So I've got an application I'm going to be building onto but I can't get it working because Tomcat won't start (error message below). I've found the property file where I can adjust the values listed in the error message, but nothing I try works.
Connection Error: Connection refused: connect (Address=127.0.0.1, Port=1412)
broadcast error message CONNECTION Properties: {PORT=1412, USER=Mark, IP=127.0.0.1, AM=ALL, GATEWAY=http://192.168.0.4:80/gateway-web/gatewayService}
reconnecting...
I've pretty much ruled out another program using the same port, and I've adjusted the user value as well... Is there any way to troubleshoot connecting to localhost? Maybe via the command line?
Any help would be hugely appreciated!
Check your firewall rules, your firewall could still prevent non well-known ports or some form of that.
Have you also verified your app is listening on that port via netstat command on localhost? See here if you don't know how: Command line for looking at specific port
The only other thing I could think of is SELinux (only applies if you are running on Linux) could be doing some mischief here, try turning it off, if it's not already disabled, command would be:
setenforce 0
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 am trying to connect serial port on ubuntu. However, It doesn't work for me. I succesfully run the same project on Windows just with different drivers. The problem is that I can't load any ports while I am using this:
CommPortIdentifier.getPortIdentifiers(); // i am using rxtx 2.1.7
It always return zero ports. I would like to use port ttyS0 whichworks great with minicon so i am sure that port is not blocked and the machine is not broken.
Anyone has a reason for this ?
It was just becouse low priviligies. I had to add myself to a group which is supposed to work with ttyS0.
I used this command
sudo chmod 666 /dev/ttyUSB0
I had the same problem and it worked the moment after I used this command. Like Smolda said, it is a permission problem.
if nothing helps, you should consider to add this line to your java code:
System.setProperty("gnu.io.rxtx.SerialPorts", "/dev/yourtty");
did it for me. (Only if you work with the RXTX library)