Thread safety issue.

[2002 JI Open Discussion]

By: Dmitriy Brovarnik - dbrovarnik

Thread safety issue.

2003-10-21 07:46

Hi,

I have bumped into a problem with Jasper Reports when I had tried to use it in multithreaded environment.

My prototype does the following:

1. Loads XML design

2. Compiles it.

3. Fills the report

4. Exports it to PDF.

 

When I run this in a single thread it works fine.

As soon as I do it in multithreaded environment I am getting the exception below:

Note: If I set a certain delay between the two concurrent threads it works sometimes. Each tread is using a separate output file for filling.

 

 

 

Caused by: java.lang.NullPointerException

at dori.jasper.engine.fill.JRVerticalFiller.addPage(JRVerticalFiller.java:987)

at dori.jasper.engine.fill.JRVerticalFiller.fillPageBreak(JRVerticalFiller.java:1042)

at dori.jasper.engine.fill.JRVerticalFiller.fillColumnBreak(JRVerticalFiller.java:1064)

at dori.jasper.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:631)

at dori.jasper.engine.fill.JRVerticalFiller.fillReportContent(JRVerticalFiller.java:295)

at dori.jasper.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:186)

at dori.jasper.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:524)

at dori.jasper.engine.fill.JRFiller.fillReport(JRFiller.java:159)

at dori.jasper.engine.JasperFillManager.fillReport(JasperFillManager.java:350)

at dori.jasper.engine.JasperFillManager.fillReportToFile(JasperFillManager.java:271)

 

 

 

I?d appreciate any help.

 

Dmitriy.