NullPointer exception while calling PrintOutputController.export()

Hi Ted,
I have a Web application running on tomcat 6.0.18. We use jrc 12.2.200 to call JAVA API for generating reports in PDF format and Cystal Report 2008 for report design.
I am getting following exception intermittently.
2009-05-01 16:47:45.859 GMT+05:30 ERROR ReportJob.java:137 Scheduler_Worker-10(34)] - [ Could not generate the Report.
java.lang.NullPointerException
at com.crystaldecisions.sdk.occa.report.application.ds.a(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.ReportSource.a(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.ReportSource.a(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.PrintOutputController.if(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.PrintOutputController.export(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.PrintOutputController.export(Unknown Source)
at test.report.ReportJob.createPDFReport(ReportJob.java:123)
at test.report.ReportJob.execute(ReportJob.java:75)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
2009-05-01 16:47:45.859 GMT+05:30 ERROR JobRunShell.java:211 Scheduler_Worker-10 - Job reportJobGroup.reportJob threw an unhandled Exception:
java.lang.NullPointerException
at com.crystaldecisions.sdk.occa.report.application.ReportClientDocument.if(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.ReportClientDocument.case(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.ClientDocument.close(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.ReportClientDocument.close(Unknown Source)
at test.report.ReportJob.createPDFReport(ReportJob.java:155)
at com.solidcore.as.report.ReportJob.execute(ReportJob.java:75)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)
There are two use cases for generating PDF reports our application:
1. A user clicks on a link on web, and the report is generated in PDF format and sent via http.
At present we are creating a new
ReportClientDocument for every request and using ExportControl.processHttpRequest() API
the report in PDF format is sent user through response.
2. Quartz schuduler trigger a job, whose work is to generate Report in PDF format into a file, and the
generated pdf file is sent to users via mail.
Here I use PrintOutputController.export() API to get the InputStream and use the input stream
to create PDF file. The call PrintOutputController.export() is syncronized, so there will be only one call to export at a time.
It is possible that a user is requesting a report on Web Page and the same report is being generated by Scheduler at the same time. A separate instance of ReportClientDocument is being used in each case. Since Report containse a huge data, and it takes time to generate PDF file so, it is possible that a given RPT file is opened by two spearate ReportClientDocuemnt (one via web user and other via Scheduler) at the same time.
Please give idea about why the exception is comming.
Thank you,
Deepak

Hi,
Did you figure out the root cause?
I am having the same issue.
Could you please help?
Thanks
Arun

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