Call Crystal Reports from Java

[jeremia tirta]

can someone help me please....
iam first time to call Crystalreports from JAVA
this is part of code:

private static final String REPORT_NAME = "jeremia.rpt";

public static void launchApplication() {

try {

//Open report.
ReportClientDocument reportClientDoc = new ReportClientDocument();
if (reportClientDoc.isOpen()){
System.out.println("Sudah terbuka");
}else{
reportClientDoc.open(REPORT_NAME, 1);
}

i try to debuging this code, but until code "reportClientDoc.open(REPORT_NAME, 1); "
i get that error :

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at com.businessobjects.reports.sdk.JRCCommunicationAdapter.<clinit>(Unknown Source)
at java.lang.Class.forName0(Native Method)

Iam using NETBEANS IDE to compile it.
What does it means, of that error?
Thanks

[Bear Bibeault]

Please KeepItDown.