[greg@wooledge.org: Re: Fw: locating blocked port]

[Haines Brown <haines@histomat.net>]

----- Forwarded message from Greg Wooledge <greg@wooledge.org> -----

Date: Thu, 2 Feb 2023 08:57:30 -0500
From: Greg Wooledge <greg@wooledge.org>
To: debian-user@lists.debian.org
Subject: Re: Fw: locating blocked port

I finally managed to get jabref to run. 

I looked at waht aprocess was using the PIS as you suggest.

  $ ps -fp 1675
  UID        PID  PPID  C STIME TTY          TIME CMD
  haines    1675  1559  0 Feb01 tty1     00:04:36 java -jar 
    /usr/local/share/JabRef/JabRef-3.2.jar

I thn kill the process and verify that port 6050 is not being used. 	

I then try to start by old version (3.2) of jabref:

  $ java -jar /usr/local/share/JabRef/JabRef-3.2.jar &
  [1] 1867
  haines@lenin:~$ Feb 04, 2023 6:58:02 AM net.sf.jabref.JabRef 
  openBibFile
  INFO: Opening: /home/haines/bibtex/historiography.bib
  Feb 04, 2023 6:58:02 AM net.sf.jabref.importer.OpenDatabaseAction 
    loadDatabase
  INFO: Synchronized special fields based on keywords
  Feb 04, 2023 6:58:02 AM net.sf.jabref.JabRef openBibFile
  INFO: Opening: /home/haines/bibtex/history.bib
  Feb 04, 2023 6:58:02 AM net.sf.jabref.importer.OpenDatabaseAction 
    loadDatabase
  INFO: Synchronized special fields based on keywords
  Exception in thread "AWT-EventQueue-0" java.lang.Error: Unable to 
  make void java.awt.EventDispatchThread.pumpEvents(>
        at spin.off.AWTReflectDispatcherFactory.<clinit>(AWTReflectDispatcherFactory.java:139)
        at spin.off.SpinOffEvaluator.<clinit>(SpinOffEvaluator.java:38)
        at spin.Spin.<clinit>(Spin.java:67)
  ...
 
It seems javref is trying to load two databases but it but it does 
not display. I suspect that is because my jabef is too old.
Neverthesless java owns port 6050 and so I kill the process. I next
load the up to date version of jabref

  $ jabref
  07:06:01.125 [AWT-EventQueue-0] WARN  net.sf.jabref.JabRefGUI - 
    There seem to be problems
    with OpenJDK and the default GTK Look&Feel. Using Metal L&F 
    instead. Change to another
    L&F with caution.
  07:06:44.206 [AWT-EventQueue-0] INFO  
    net.sf.jabref.logic.importer.OpenDatabase - Opening:
    /home/haines/bibtex/historiography.bib
  07:06:47.708 [AWT-EventQueue-0] INFO  
    net.sf.jabref.logic.importer.OpenDatabase - Opening:
      /home/haines/bibtex/history.bib

This this time jabref started. I opened three databaes it didn't open 
automatically. Another database it did see. I pyt thst issue aside.

While writing this message jabref crashed and no longer claims 
port 6060. I restarted it and so far it has no crashed.		



On Thu, Feb 02, 2023 at 08:48:43AM -0500, Haines Brown wrote:
> > Now the quetion is, what process is using that port?
> > 
> >    $ sudo ss -pt state listening 'sport = :6050'
> >    Recv-Q  Send-Q  Local Address:Port       Peer Address:Port  
> >    Process
> >    0       1       [::ffff:127.0.0.1]:6050  *:*                
> >    users:(("java",pid=1675,fd=14))
> > 
> > Is java holding that port? Is jabref then trying to use the port 
> > for itself? If so, is this a bug? (I run testing)

> You've got a PID, so the next thing *I* would do is ps -fp 1675



-- 

     Haines Brown 
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