BIRT is generating reports without BIRT report runtime

Hi,
 
I am a newbie to BIRT and wrote a simple java class to generate pdf report from my sql db. I have installed report designer in my eclipse IDE. I haven't install any BIRT runtime on my machine. What I did was designing report from eclipse and then just execute my java class. That code generated the PDF file as expected getting data from the DB. So, should I install and run BIRT report generating runtime explicitly ? Can you explain how BIRT is working here ?
 
 
Following is the main method of the java class
 
Regards,
Malintha
 
public static void main(String[] args) { 
EngineConfig conf = null; 
ReportEngine eng = null; 
IReportRunnable design = null; 
IRunAndRenderTask task = null; 
HTMLRenderContext renderContext = null; 
HashMap contextMap = null; 
PDFRenderOption options = null; 
conf = new EngineConfig(); 
eng = new ReportEngine( conf ); try 
{ 
design = eng.openReportDesign("/home/malintha/projects/Reporting/pc_test_report.rptdesign"); 
} catch (Exception e) 
{ 
e.printStackTrace(); 
System.exit(-1); 
} 
task = eng.createRunAndRenderTask(design); 
renderContext = new HTMLRenderContext(); 
renderContext.setImageDirectory("image"); 
contextMap = new HashMap(); 
contextMap.put( EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT, renderContext ); 
task.setAppContext( contextMap ); 
options = new PDFRenderOption(); 
options.setOutputFileName("/home/malintha/output.pdf"); 
options.setOutputFormat("pdf"); 
task.setRenderOption(options); try 
{ 
task.run(); 
} catch (Exception e) 
{ 
e.printStackTrace(); 
System.exit(-1); 
}
eng.destroy(); 
} 
}

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