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From "Srijith Kochunni" <>
Subject Re: exception with ports < 80.
Date Thu, 11 Dec 2008 06:14:44 GMT


            Just to narrow down on things, I wrote a simple Daemon class as follows 
                 public class MyDaemon implements Daemon  

ServerSocket socket; 
private String[] args; 
public void destroy()  
System.out.println("In destroy"); 


public void init(DaemonContext arg0) throws Exception  
// TODO Auto-generated method stub 
args = arg0.getArguments(); 
socket = new ServerSocket(); 
System.out.println("In init"); 


public void start() throws Exception  
SocketAddress endpoint; 
int port = Integer.parseInt(args[0]); 
endpoint = new InetSocketAddress(port); 
// TODO Auto-generated method stub 
catch(Exception e) 
System.out.println("Cannot bind on port " + port); 
System.out.println("In start"); 


public void stop() throws Exception  
// TODO Auto-generated method stub 
System.out.println("In stop"); 


          and I run the same class using jsvc as ./jsvc -debug -verbose -cp commons-daemon.jar:testj1.jar
com.test.MyDaemon 125 

          I always get a BindException saying Permission denied. What am I doing wrong. I
am running as root and also the port is very much available. Have herewith attached the jsvc

          Any help / suggestions would be highly valued. 


>>> "Srijith Kochunni" <> 12/10/2008 7:16 PM >>>

Hi All,

          I am using jsvc to daemonize my java application, which runs on a Linux box. I get
an error Permission denied. I get this only for ports < 1024 and
I understand on linux to bind to any ports which are below 1024, you require root permission.
Therefore I am launching my application as root. However I still am not able to get the privileges
required. My JSVC arguments are as follows.

   jsvc.exec -debug -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8008
-jvm server -user root -home $JAVA_HOME
  -outfile /var/opt/myfile.out -pidfile /var/run/ -errfile '&1'  

          I am launching as root user and also in jsvc arguments I have specified "-user root",
but am at a loss as to why I am still getting this exception, when I launch my jetty server.
When I tried to launch it normally outside jsvc, it works fine. I have searched on the net,
and also came across this message thread
where it suggested, that some system call had been modified and it worked thereafter, but
did not find the details. 

         Have run strace, but could not find any errors.
On starting in debug mode,  I see the following messages,
10/12/2008 18:55:30 6349 jsvc debug: user changed to 'root'
10/12/2008 18:55:30 6348 jsvc debug: User 'root' validated
and I also don't see any errors.

      Any help / suggestions in this regard would be greatly appreciated.


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