private ByteArrayOutputStream generateOutput(int report)
			throws EngineException {
...
task.run();
...
}

05.10.2009 14:55:42 org.eclipse.birt.report.engine.api.impl.RunAndRenderTask doRun
SCHWERWIEGEND: An error happened while running the report. Cause:
java.lang.NullPointerException
	at org.eclipse.birt.report.engine.executor.ReportExecutor.execute(ReportExecutor.java:123)
	at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportExecutor.execute(WrappedReportExecutor.java:60)
	at org.eclipse.birt.report.engine.internal.executor.dup.SuppressDuplciateReportExecutor.execute(SuppressDuplciateReportExecutor.java:42)
	at org.eclipse.birt.report.engine.internal.executor.wrap.WrappedReportExecutor.execute(WrappedReportExecutor.java:60)
	at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.doRun(RunAndRenderTask.java:168)
	at org.eclipse.birt.report.engine.api.impl.RunAndRenderTask.run(RunAndRenderTask.java:75)
	at de.itrn.svp.printing.PrintingEngine.generateOutput(PrintingEngine.java:298)
	at de.itrn.svp.printing.PrintingEngine.<init>(PrintingEngine.java:114)
	at de.itrn.sv.finance.views.InvoiceView$4.widgetSelected(InvoiceView.java:165)
	...

public class PrintingEngine {

	private IReportRunnable design;
	private int dialogResult;
	private ReportEngine engine;
	private EngineConfig engineConfig;

	private final Object model;
	private ByteArrayOutputStream outputStream;
	private final Integer outputType;

	private IRunAndRenderTask task;
	ElementFactory designFactory = null;
	ReportDesignHandle designHandle = null;
	StructureFactory structFactory = null;


public PrintingEngine(Object model, Integer outputType, Boolean print,
			int report) {

	this.model = model;
	this.outputType = outputType;

	try {
		initEngine(report);
		loadReportDesign(report);
		task = engine.createRunAndRenderTask(design);
		setConnectionParameters();
		generateOutput(report);
	} catch (EngineException e) {
		e.printStackTrace();
	}

	if (print) {
		print(outputStream);
	}

	closeEngine();
}

private ByteArrayOutputStream generateOutput(int report)
			throws EngineException {

	IRenderOption options = new RenderOption();
	options.setOutputStream(outputStream);

	switch (outputType) {
	case PT_PDF:
		RenderContext pdfCtx = new RenderContext(new ExecutionContext());
		HashMap<String, RenderContext> pdfContextMap = new HashMap<String, RenderContext>();
		pdfContextMap.put(EngineConstants.APPCONTEXT_PDF_RENDER_CONTEXT,
				pdfCtx);
		task.setAppContext(pdfContextMap);
		options.setOutputFormat("pdf");
		break;
			
		...
			
	default:
		break;
	}

	// Set PrintDate
	task.setParameterValue("printDate", DisplayFormat.shortDate(new Date()));

	// Fill by ReportType
	switch (report) {
	case RPT_INVOICE:
		task.setParameterValue("id_invoice",
				((Invoice) model).getIdInvoice());
		task.setParameterValue("ust", 19);
		break;
			
		...
		
	case RPT_REMINDER1:
		Invoice invoice = (Invoice) model;
		task.setParameterValue("id_invoice", invoice.getIdInvoice());
		task.setParameterValue("dialogResult", dialogResult);
		break;
	default:
		break;
	}
	outputStream = new ByteArrayOutputStream();
	options.setOutputStream(outputStream);

	task.setRenderOption(options);
	task.run();

	return outputStream;
}

private void initEngine(int report) throws EngineException {

	// create instance of EngineConfig
	engineConfig = new EngineConfig();
	engineConfig.setLogConfig(LOGDIR, Level.ALL);

	engine = new ReportEngine(engineConfig);
	engine.changeLogLevel(Level.FINE);

}
private void setConnectionParameters() {
	task.setParameterValue("jdbc_driver_class", "org.postgresql.Driver");

	task.setParameterValue("db_user",
			de.itrn.sv.database.Activator.getDefault()
					.getPreferenceStore()
					.getString(DatabasePreferenceConstants.P_DBUSER));

	task.setParameterValue("jdbc_driver_url", "jdbc:postgresql://"
			+ de.itrn.sv.database.Activator.getDefault()
					.getPreferenceStore()
					.getString(DatabasePreferenceConstants.P_DBHOST) + "/"
			+ de.itrn.sv.database.Activator.getDefault()
					.getPreferenceStore()
					.getString(DatabasePreferenceConstants.P_DBNAME));

	task.setParameterValue("db_password",
			de.itrn.sv.database.Activator.getDefault()
					.getPreferenceStore()
					.getString(DatabasePreferenceConstants.P_DBPASSWD));
}
	
private void closeEngine() {
	task.close();
	engine.destroy();
}

private void loadReportDesign(int report) throws EngineException {
	String reportFile = Activator.getDefault()
			.getPreferenceStore()
			.getString(PrintingPreferenceConstants.TPL_PATH);

	switch (report) {
	case RPT_INVOICE:
		reportFile += "invoice.rptdesign";
		design = engine.openReportDesign(reportFile);
		break;

		...

	case RPT_REMINDER1:
		reportFile += "reminder1.rptdesign";
		design = engine.openReportDesign(reportFile);
		break;
	default:
		break;
	}
}

public String save(ByteArrayOutputStream bos, String fileName) {
	try {
		// Redirect to File
		String path = Activator.getDefault()
				.getPreferenceStore()
				.getString(PrintingPreferenceConstants.PDF_OUTPUT);
		if (fileName == null) {
			fileName = path + "/tmpPrint.pdf";
		} else {
			fileName = path + fileName + ".pdf";
		}
		OutputStream out = new FileOutputStream(fileName);
			bos.writeTo(out);
		out.close();
	} catch (Exception e) {
		e.printStackTrace();
	}
	return fileName;
}
	
}