null pointer exception while starting the engine

vineethakp

This is my code for combining two reports.


=============================================================================================================

package com.report.test;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.core.framework.Platform;
import org.eclipse.birt.report.engine.api.EngineConfig;
import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.engine.api.IReportEngineFactory;
import org.eclipse.birt.report.engine.api.IReportRunnable;
import org.eclipse.birt.report.engine.api.IRunAndRenderTask;
import org.eclipse.birt.report.engine.api.PDFRenderOption;

public class Combine {

public void runReport() throws BirtException, IOException
{
IReportEngine iReportEngine =null;
EngineConfig engineConfig = null;
try
{
engineConfig = new EngineConfig();
engineConfig.setEngineHome("C:\\birt-runtime-2_6_2\\birt-runtime-2_6_2\\ReportEngine");
System.out.println("Setting Engine Home");
engineConfig.setLogConfig(null, Level.OFF);

Platform.startup(engineConfig);
System.out.println("Platform Started");

IReportEngineFactory iReportEngineFactory = (IReportEngineFactory) Platform.createFactoryObject(IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
iReportEngine = iReportEngineFactory.createReportEngine(engineConfig);
System.out.println("Report Engine Created");
}
catch (Exception e) {
e.printStackTrace();
}

IReportRunnable design1 = iReportEngine.openReportDesign("F:\\MyWorkSpace\\Merging\\WebRoot\\reports\\Report_A.rptdesign");
IReportRunnable design2 = iReportEngine.openReportDesign("F:\\MyWorkSpace\\Merging\\WebRoot\\reports\\Report_B.rptdesign");

IRunAndRenderTask iRunAndRenderTask = iReportEngine.createRunAndRenderTask(design1);


FileOutputStream fileOutputStream1 = new FileOutputStream("C/output/combined.pdf", true);
PDFRenderOption pdfRenderOption = new PDFRenderOption();
pdfRenderOption.setOutputStream(fileOutputStream1);
pdfRenderOption.setOutputFormat("PDF");
iRunAndRenderTask.setRenderOption(pdfRenderOption);
iRunAndRenderTask.run();

iRunAndRenderTask = iReportEngine.createRunAndRenderTask(design2);
FileOutputStream fileOutputStream2 = new FileOutputStream("C/output/combined.pdf", true);
pdfRenderOption.setOutputStream(fileOutputStream2);
iRunAndRenderTask.setRenderOption(pdfRenderOption);
iRunAndRenderTask.run();

fileOutputStream1.flush();
fileOutputStream2.flush();
fileOutputStream1.close();
fileOutputStream2.close();

iRunAndRenderTask.close();
iReportEngine.destroy();
Platform.shutdown();
System.out.println("Finished");
}

public static void main(String args[]) throws FileNotFoundException, BirtException
{
try {
Combine combine = new Combine();
combine.runReport();
}
catch (Exception e)
{
e.printStackTrace();
}

}

}
=============================================================================================================
But i am getting this Exception.

java.lang.NullPointerException
at org.eclipse.birt.report.engine.api.impl.ReportEngine$EngineExtensionManager.<init>(ReportEngine.java:784)
at org.eclipse.birt.report.engine.api.impl.ReportEngine.<init>(ReportEngine.java:109)
at org.eclipse.birt.report.engine.api.impl.ReportEngineFactory$1.run(ReportEngineFactory.java:18)
at org.eclipse.birt.report.engine.api.impl.ReportEngineFactory$1.run(ReportEngineFactory.java:1)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.birt.report.engine.api.impl.ReportEngineFactory.createReportEngine(ReportEngineFactory.java:14)
at com.report.test.Combine.runReport(Combine.java:33)
at com.report.test.Combine.main(Combine.java:74)
java.lang.NullPointerException
at com.report.test.Combine.runReport(Combine.java:40)
at com.report.test.Combine.main(Combine.java:74)


If my code is perfect. Please tell me in detail what jars should be copied to my workspace lib from birt-runtime.

JasonW

Try something like the following:
package REAPI;



import java.util.logging.Level;

import org.eclipse.birt.core.framework.Platform;
import org.eclipse.birt.report.engine.api.EngineConfig;
import org.eclipse.birt.report.engine.api.EngineException;
import org.eclipse.birt.report.engine.api.PDFRenderOption;

import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.engine.api.IReportEngineFactory;
import org.eclipse.birt.report.engine.api.IReportRunnable;
import org.eclipse.birt.report.engine.api.IRunAndRenderTask;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;



import com.lowagie.text.pdf.PdfAction;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.PdfCopyFields;
import com.lowagie.text.Document;
import com.lowagie.text.Paragraph;




public class CombineReportsPDF {

public void concat(byte[] ba1, byte[] ba2, String outpath){

try{

//Document document = new Document();
//ByteArrayOutputStream baos = new ByteArrayOutputStream();
//PdfWriter writer = PdfWriter.getInstance(document, baos);

//PdfAction pdfAction = new PdfAction(PdfAction.PRINTDIALOG);
//writer.setOpenAction(pdfAction);
//document.open();
//writer.addJavaScript(
// "this.print({bUI: true,bSilent: false,bShrinkToFit: true});" +
//"\r\n" +
//"this.closeDoc();"
//);
//document.add(new Paragraph("What is this doing"));


//PdfReader js1 = new PdfReader(baos.toByteArray());
PdfReader rd1 = new PdfReader( ba1 );
PdfReader rd2 = new PdfReader( ba2 );
PdfCopyFields cpy = new PdfCopyFields( new FileOutputStream( outpath ));
//cpy.addDocument(js1);
cpy.addDocument(rd1);
cpy.addDocument(rd2);
//cpy.addJavaScript( "this.print({bUI: true,bSilent: false,bShrinkToFit: true});" +
// "\r\n" +
// "this.closeDoc();"
// );
//document.close();
cpy.close();

}catch(Exception e){
e.printStackTrace();
}

}

public void runReport() throws EngineException
{

IReportEngine engine=null;
EngineConfig config = null;

try{

config = new EngineConfig( );
config.setBIRTHome("C:\\birt\\birt-runtime-2_6_1\\birt-runtime-2_6_1\\ReportEngine");
config.setLogConfig(null, Level.OFF);
Platform.startup( config );
IReportEngineFactory factory = (IReportEngineFactory) Platform
.createFactoryObject( IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY );
engine = factory.createReportEngine( config );
}catch( Exception ex){
ex.printStackTrace();
}

IReportRunnable design, design2 = null;
//Open the report design
design = engine.openReportDesign("Reports/TopNPercent.rptdesign");
design2 = engine.openReportDesign("Reports/TopSellingProducts.rptdesign");



//Create task to run and render the report,
IRunAndRenderTask task = engine.createRunAndRenderTask(design);
task.setParameterValue("Top Percentage", (new Integer(3)));
task.setParameterValue("Top Count", (new Integer(5)));
task.validateParameters();

PDFRenderOption options = new PDFRenderOption();
ByteArrayOutputStream fso= new ByteArrayOutputStream();

ByteArrayOutputStream fso2= new ByteArrayOutputStream();
options.setOutputStream(fso);
options.setOutputFormat("pdf");

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

//Create task to run and render the report,
task = engine.createRunAndRenderTask(design2);


options.setOutputStream(fso2);
options.setOutputFormat("pdf");

task.setRenderOption(options);


task.run();
task.close();

concat( fso.toByteArray(), fso2.toByteArray(), "output/resample/Combined.pdf");

engine.destroy();
Platform.shutdown();
System.out.println("Finished");
}


/**
* @param args
*/
public static void main(String[] args) {
try
{

CombineReportsPDF ex = new CombineReportsPDF( );
ex.runReport();

}
catch ( Exception e )
{
e.printStackTrace();
}
}


}

Put the jars in the report engine download birt-runtime-version\ReportEngine\lib
in your buildpath if you are using eclipse. Also add com.lowagie.text_version.jar from the plugins directory
birt-runtime-version\ReportEngine\plugins to your build path.

Jason