A problem in executing exp.exe through Java

while implementing oracle schema export I am facing problem in executing the exp.exe from JAVA. Please see sample code below.
Process p=null;
ProcessBuilder pb = new ProcessBuilder ("exp.exe","username/password@dbinstance", "owner=pr01",
"file=e:/temp/pr98.dmp","log=e:/temp/pr98.log","compress=y","grants=n","STATISTICS=COMPUTE");
try{
p = pb.start();
catch(Exception e){
System.out.println("Error="+e.getMessage());
where pr01 - name of schema to export.
With this code, the actual export of the project starts only after Java application is closed and not immediately on the click of a button.
I have used Runtime.exec() tooo...The same problem is there..
Any solution?

HI
Did you fix this problem with svrmgr. I have exactly the same problem and I am runing redhat 7.2 and oracle 8.1.6
Thanks, Jason

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What part of
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