Re: locating blocked port
On Tue, Jan 31, 2023 at 10:05:12AM -0500, Haines Brown wrote:
> I have an application that refuses to start because its port is
> blocked. But I have difficulty knowing what port it is
>
> $ java -jar /usr/local/share/JabRef/JabRef-3.2.jar &
> [1] 4831
> haines@lenin:~$ Jan 31, 2023 8:36:39 AM net.sf.jabref.logic.remote.server.Remote
> ListenerServerLifecycle open
> WARNING: Port is blocked
> java.net.BindException: Address already in use
> at java.base/sun.nio.ch.Net.bind0(Native Method)
> at java.base/sun.nio.ch.Net.bind(Net.java:555)
> at java.base/sun.nio.ch.Net.bind(Net.java:544)
> at java.base/sun.nio.ch.NioSocketImpl.bind(NioSocketImpl.java:643)
> at java.base/java.net.ServerSocket.bind(ServerSocket.java:388)
> at java.base/java.net.ServerSocket.<init>(ServerSocket.java:274)
> at net.sf.jabref.logic.remote.server.RemoteListenerServer.<init>(RemoteListenerServer.java:40)
> at net.sf.jabref.logic.remote.server.RemoteListenerServerThread.<init>(RemoteListenerServerThread.java:33)
> at net.sf.jabref.logic.remote.server.RemoteListenerServerLifecycle.open(RemoteListenerServerLifecycle.java:41)
> at net.sf.jabref.JabRef.start(JabRef.java:137)
> at net.sf.jabref.JabRefMain.main(JabRefMain.java:8)
>
> Arguments passed on to running JabRef instance. Shutting down.
>
> How do I know from this what port the java application tried to use?
>
> I try:
>
> $ strings $(which jabref) | wc -l
> 56
Oh boy,
why would the number of strings in that binary ever relate to the port
being used?
How about looking at the documentation instead?
https://docs.jabref.org
>
> So I try:
>
> $ sudo ss -pt state listening 'sport = :56'
> Recv-Q Send-Q Local Address:Port Peer Address:Port Process
>
> This seems a null return. Dores this mean jabref is not using port
> 56?
>
>
NC
-H
--
Henning Follmann | hfollmann@itcfollmann.com
Reply to: