how to overcome the nullpointer exception

Hi friends while I try a sample code I found some difficulties.

The sample code is

public class CrystalClient {
private static final String CONNECT_STRING = "DSN=abp";
private static final String REPORT_FILE_NAME = "d:\\arp\\Report1.rpt";
private static final String SQL_QUERY = "select * from student";
private static final String PRINT_FILE = "d:\\arp\\YourNewReport.doc";


public static void main(String args[]) throws Exception{
try {
crystal.CrystalReport report = new crystal.CrystalReport();

//report.aboutBox(); // Lets see if it was loaded properly



report.setConnect(CONNECT_STRING);

report.setReportFileName(REPORT_FILE_NAME);

report.setSQLQuery(SQL_QUERY);

report.setPrinterCopies((short) 1);
report.setPrinterCollation(crystal.PrinterCollatio nConstants.crptDefault);

report.setDestination(crystal.DestinationConstants .crptToFile);
report.setPrintFileName(PRINT_FILE);
report.setPrintFileType(crystal.PrintFileTypeConst ants.crptWinWord); // Change output type if necessary

report.printReport();

}
catch(Exception e)
{
System.out.println(e);
e.printStackTrace();
}
finally {
com.linar.jintegra.Cleaner.releaseAll();
}
}
}

The output of the execution is ....

java.lang.NullPointerException
at crystal.CrystalReport.printReport(CrystalReport.ja va:4482)
java.lang.NullPointerException
at javaapplication10.CrystalClient.main(CrystalClient .java:42)
BUILD SUCCESSFUL (total time: 0 seconds)

How can I overcome this.

arputharaj