From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gustavo Guillermo =?iso-8859-1?q?P=E9rez?= 
	<gustavo@compunauta.com>
Subject: Re: launching a java application in background
Date: Thu, 3 Feb 2005 15:16:09 +0000
Message-ID: <200502031516.09482.gustavo@compunauta.com>
References: <4200FED4.20007@tid.es>
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To: mgc@tid.es, linux-admin@vger.kernel.org

El Mi=E9rcoles, 2 de Febrero de 2005 16:24, escribi=F3:
> Dear all,
>
> I need to launch a java proccess as a daemon, in background.
>
> It would be like the following:
>
>
> java bin/aplicacion.jar
>
> In interactive mode works fine. We have tried to launch it in backgro=
und
> using nohup.
>
> If I send everything (all redirections <> ) to /dev/null it works, bu=
t I
> do not get the logs
>
> We have tried:
>
> java bin/aplication.jar < /dev/null  > output.log 2>&1 &
>
> But I get in the output file carachters like "->"
>
> Any time of getting those logs?
>
> I hope I have explained myself fine
>
> Regards
>
> Miguel
To deal with this I change on my Java applications, the System.out.* By=
 calls=20
to other kind of OUT, then you can make a simple pointer by default fro=
m=20
System.out, System.err, or substitute this by file output, then you can=
 pass=20
an extra argumento to your software to log by default on a file, and us=
e the=20
same object (could be static code).
Java have a mechanism to put a thread on a background, in daemon mode, =
you=20
should find more about. Here is an example how I use an objet to have=20
properties, like out, and err, you can establish a socket, or open a fi=
le for=20
writing and you can set the new output calling setOut or setErr.

------------------
package com.compunauta.util;

/**
 * Title:        RUNTimeManager
 * Description:  OUT, ERR, PROPERTIES, handler for threads.
 * for html parser.
 * Copyright:    Copyright (c) 2001
 * Company:      www.compunauta.com
 * @author Gustavo Guillermo P=E9rez
 * @version 1.0
 */
import java.io.PrintStream;
import java.io.BufferedReader;
import java.util.Properties;
import java.util.Hashtable;
public class RunTimeManager {
public int EXIT_CODE=3D0;
public boolean BIGFAILURE=3Dfalse;
public boolean DEBUG=3Dfalse;
public boolean CHILDREN_MODE=3Dfalse;
public boolean STOP=3Dfalse;
public PrintStream out=3DSystem.out;
public PrintStream err=3DSystem.err;
public static String WORK_DIR=3D"./";
public Properties p=3D(Properties)null;
public static Properties sp=3Dnew Properties();
public static Hashtable h=3Dnew Hashtable(10);
public BufferedReader in=3Dnew BufferedReader(new=20
java.io.InputStreamReader(System.in));
  public RunTimeManager(){}
  public RunTimeManager(boolean debug){this.DEBUG=3Ddebug;}
  public RunTimeManager(boolean debug,boolean standalone)
{this.DEBUG=3Ddebug;this.CHILDREN_MODE=3D!standalone;}

  public void setChildren(boolean value){CHILDREN_MODE=3Dvalue;}
  public void setStandAlone(boolean value){CHILDREN_MODE=3D!value;}
  public void setChildren(){CHILDREN_MODE=3Dtrue;}
  public void setStandAlone(){CHILDREN_MODE=3Dfalse;}
  public boolean VERVOSE=3Dtrue;
  public boolean exit(int EXIT_CODE){
  this.EXIT_CODE=3DEXIT_CODE;
  this.STOP=3Dtrue;
    if (EXIT_CODE!=3D0){BIGFAILURE=3Dtrue;}
    if (CHILDREN_MODE) return true;
    else System.exit(EXIT_CODE);
    return false;
  }//end exit

  public void reset(){
    this.BIGFAILURE=3Dfalse;
    this.EXIT_CODE=3D0;
    this.STOP=3Dfalse;
  }//end reset

  public void setOut(PrintStream out){
    this.out=3Dout;
  }//end out

  public void setErr(PrintStream err){
    this.err=3Derr;
  }//end err

  public void setIn(BufferedReader in){
    this.in=3Din;
  }//end err
  public void setPropertiesFromHash(String Key){
    Object ob=3Dh.get(Key);
    Properties p;
    if (ob=3D=3Dnull) {p=3Dnew Properties();h.put(Key,p);}
    else {p=3D(Properties)ob;}
  }//end setpropfromhash
  public void setDebugOn(){this.DEBUG=3Dtrue;}
  public void setDebugOff(){this.DEBUG=3Dfalse;}

public void setProperty(String Key, String Value){
  if (this.p=3D=3Dnull){sp.setProperty(Key,Value); return;}
  this.p.setProperty(Key,Value);
}//end setproperty


public String getProperty(String Key, String Default){
  if (this.p=3D=3Dnull){return sp.getProperty(Key,Default);}
  else {String ob=3Dp.getProperty(Key,Default);
    if (ob=3D=3Dnull){
      return sp.getProperty(Key,Default);
    }else return ob;
  }

}//end getProperty

public String getProperty(String Key){
  return getProperty(Key,null);
}//end getProp
public static String getEnvironOs(){
//REQManipulation env=3Dnew REQManipulation(System.getProperty("os.name=
"));
  String env=3DSystem.getProperty("os.name");
//  System.out.println(System.getProperties());
if (env.toLowerCase().indexOf("linux")!=3D-1) return "l";
if (env.toLowerCase().indexOf("windows")!=3D-1) return "w";
if (env.toLowerCase().indexOf("sol")!=3D-1) return "s";
  return "w";
}//end getEnvironOs

}//end class



--=20
Gustavo Guillermo P=E9rez
Compunauta uLinux
www.ulinux.tk
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