Java Program destroys Linux Server Display or Server logs out Automatically

Question

hi,
i am facing problem when my servlet program is running.
my servlet starts a process at server which is a simple java program which publishes PDF,
XML, RTF files and lates long to run for about 45 minutes.
i give a call to a shell file on the server (Red Hat Linux 9.0) which in turns calls a java
program that runs on gnome-terminal.
i have started Tomcat from SSh for that i have exported DISPLAY (Environment variable) from
.bash_profile. i need to do this because i need graphics environment (X11 Windows) for jfor
which is used print jpeg images in PDF and RTF reports.
PROBLEM
Some time my server display gets destroyed or the server gets Logout automatically, when my
process is running.
following is sode to start a gnome-terminal
strCommand="gnome-terminal -x /root/PWAppSh/StartPartialRunOff.sh PartialRunOffApp "+
strpubType + " "  +  strGroupNumber +" "+ id + " " + Cur_Time+" "+ strPubDate +" "+
strFromDate +" "+ strToDate ;
p = rt.getRuntime().exec(strCommand);
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(strRootPath
+ "/pw/WEB-INF/classes/pid.txt")));
                         pid= "";
                         while((pid = br.readLine()) != null)
                              getPid=pid;
                         ses.setAttribute("process",getPid);
                         ses.setAttribute("RunType",strrunType);
                         System.out.println("#Get Process ID:"+getPid);
                         FileOutputStream fos = new
FileOutputStream(strRootPath+"/pw/System/Mgmt/Sessions/RunoffOutput.txt");
                         Stdout_Stderr errorGobbler = new
                              Stdout_Stderr(p.getErrorStream(), "ERROR");
                         // any output?
                         Stdout_Stderr outputGobbler = new
                              Stdout_Stderr(p.getInputStream(), "OUTPUT",
fos);
                         // kick them off
                         errorGobbler.start();
                         outputGobbler.start();
                         // any error???
                         int exitVal = p.waitFor();
                         System.out.println("StartRunoff ExitValue: " +
exitVal);shell script that get executed from servlet is as followes
cd /
cd /share/Tomcat-4/jakarta-tomcat-4.1.31/webapps/pw/WEB-INF/classes
     echo $$ > pid.txt
     echo "Path: `pwd`"
     echo "Process ID:" $$
     chmod 777 pid.txt
     echo Redirecting ProcessID
     echo "Current shell : " $SHELL   
     export
PATH=$PATH:$HOME/bin:/usr/java/j2sdk1.4.2_08/bin:/usr/java/j2sdk1.4.2_08/lib:.:/share/amol/l
ib/.:
     export
CLASSPATH=.:/share/amol/lib/activation-1.0.1.jar:/share/amol/lib/ant.jar:/share/amol/lib/ava
lon-framework-cvs-20020806.jar:/share/amol/lib/batik.jar:/share/amol/lib/fop.jar:/share/amol
/lib/jfor-0.7.2rc1.jar:/share/amol/lib/xalan-2.4.1.jar:/share/amol/lib/mail-1.2.jar:/share/a
mol/lib/xerces-1.2.3.jar:/share/amol/lib/jimi-1.0.jar:/share/amol/lib/logkit-1.0.1.jar:/shar
e/amol/lib/firebirdsql-full.jar:/share/amol/lib/xercesImpl-2.2.1.jar
     exec java -server -Xmx256m -Xoss200M PW/Runoff/$1 $2 $3 $4 $5 $6 $7setting that i have done in .bash_profile file
DISPLAY=$HOST:0
export DISPLAY HOSTcan any one suggest or any solution to problem why my linux server Logsout ar display gets
destroyed when my Program is runnig on Gnome terminal.
kindly help me,
Thanks in advance for ur most important suggestion or solution.

Answer 1

Sounds a lot like a bug in some of the native libraries you use (or even in AWT). Try looking into your log files (especially for X and for your tomcat) to find out if any error messages are printed.
Additionally there are X servers out there that don't need any concrete display hardware to run (Xvfb comes to my mind, but IIRC there are more modern alternatives available). Usign that might or might not solve your problem, but would be a good idea either way.