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DISPLAY variable needed for Filling a report?


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Hello out there,


I generated a nice report with iReport and now

I want to use a litte java program to generate reports in "batch" on a linux server. I

coded this little piece of snippet:


import net.sf.jasperreports.engine.*;

import java.util.HashMap;

public class runReport


public static void main(String[] args)


JasperReport jasperReport;

JasperPrint jasperPrint;



jasperReport = JasperCompileManager.compileReport(


jasperPrint = JasperFillManager.fillReport(

jasperReport, new HashMap(), new JREmptyDataSource());


jasperPrint, "../hrmodul/simple_report.pdf");


catch (JRException e)







And there is the problem, it throws me an exception in line with the FillManager:

Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.

at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)

at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:175)

at java.lang.Class.forName1(Native Method)

at java.lang.Class.forName(Class.java:180)

at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:91)

at net.sf.jasperreports.engine.util.JRGraphEnvInitializer.initializeGraphEnv(JRGraphEnvInitializer.java:58)


and so on...


What is this? I don't want to SHOW the report.


Many thanks.


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Even if you are not showing the report, JR would still use AWT to do the layout and calculations and needs fonts metrics and staff.

So you either install and X-server or use JDK with the -Djava.awt.headless=true option (requires JDK > 1.4) or use other solutions such as Xvfb or PJA.


I hope this helps.


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The -djava.awt.headless=true option still uses the X11 libraries, it just doesn't require a running X server. The end results are the same


No bad effects that I have encountered. I imagine it uses a bit more memory, since the font metrics, etc are loaded into it via the Xlib instead of being retained on the X server. Just a guess though.



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