java.lang.NullPointerException - Trace in Java Mapping

[Former Member]

Hi,

How to resolve this error ????

I am executing below code in Eclipse.

package com.sap.integration.sfsf;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.util.HashMap;

import java.util.Map;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import com.sap.aii.mapping.api.AbstractTrace;

import com.sap.aii.mapping.api.AbstractTrace;

import com.sap.aii.mapping.api.StreamTransformation;

import com.sap.aii.mapping.api.StreamTransformationConstants;

import com.sap.aii.mapping.api.StreamTransformationException;

public class PassThrough implements StreamTransformation

{

                    //private Map param = null;

    private AbstractTrace trace = null;

              public void setParameter(Map param)

              {

               this.trace = (AbstractTrace) param.get(StreamTransformationConstants.MAPPING_TRACE);

              }

          public void execute(InputStream arg0, OutputStream arg1) throws StreamTransformationException

      {    

                       //AbstractTrace trace = (AbstractTrace)params.get(StreamTransformationConstants.MAPPING_TRACE);

               //trace = (AbstractTrace)param.get(StreamTransformationConstants.MAPPING_TRACE);

               trace.addInfo("Processing message Starts. Execute Method.");

                 System.out.println("Processing message Starts. Execute Method.");

      }

      public static void main(String[] args)

      {

          try

          {       

           InputStream in = new FileInputStream(new File("K:/QueryOperation.xml"));     

           OutputStream out = new FileOutputStream(new File("K:/Output.xml"));      

           PassThrough myMapping = new PassThrough();

           myMapping.execute(in, out);

          }          

          catch (Exception e)

          {     

             e.printStackTrace();   

          }

      }

}

[Former Member]

Hi Prabhat,

Hope the below code will solve your problem. I have done some modifications to your code!

Reward points if it solves your problem.

public class PassThrough implements StreamTransformation
{
    private Map param = null;
    private AbstractTrace trace = null;
   
public void setParameter(Map objparam)
    {
  this.param = objparam;
  if(objparam == null)
  {
   this.param = new HashMap();
   //this.trace = (AbstractTrace) param.get(StreamTransformationConstants.MAPPING_TRACE);

        }

    public void execute(InputStream arg0, OutputStream arg1) throws StreamTransformationException
    {    
  trace = (AbstractTrace)objMap.get(StreamTransformationConstants.MAPPING_TRACE );
  trace.addWarning("Processing message Starts. Execute Method.");
 
  BufferedReader br = new BufferedReader(new InputStreamReader(arg0));
  BufferedWriter bw = new BufferedWriter (new OutputStreamWriter(arg1));
 
  try
  {
  // use br to read the file content
  {
  catch()
  {
  }
  finally
  {
   try
   {
   // close all steam and buffers
   }
   catch()
  }
}

    public static void main(String[] args) throws FileNotFoundException, StreamTransformationException
    {
        FileInputStream in = new FileInputStream("K:\\QueryOperation.xml");     
        FileOutputStream out = new FileOutputStream("K:\\Output.xml");      
        PassThrough myMapping = new PassThrough();
        myMapping.execute(in, out);
  System.out.println("Executed Successfully");
}          
}

Regards,

Stephen Rouvier

[Former Member]

Hi,

Still not working.

Error : -

java.lang.NullPointerException at com.sap.integration.sfsf.PassThrough.execute(

PassThrough.java:44)

at com.sap.integration.sfsf.PassThrough.main(

PassThrough.java:76)

I have executed following code line by line ..

package com.sap.integration.sfsf;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.HashMap;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.sap.aii.mapping.api.AbstractTrace;
import com.sap.aii.mapping.api.AbstractTrace;
import com.sap.aii.mapping.api.StreamTransformation;
import com.sap.aii.mapping.api.StreamTransformationConstants;
import com.sap.aii.mapping.api.StreamTransformationException;

public class PassThrough implements StreamTransformation
{
private Map param = null;
    private AbstractTrace trace = null;
   
    public void setParameter(Map objparam)
    {
     this.param = objparam;
     if(objparam == null)
     {
      this.param = new HashMap();
     }
    }

public void execute(InputStream arg0, OutputStream arg1) throws StreamTransformationException
      {    
               trace = (AbstractTrace)param.get(StreamTransformationConstants.MAPPING_TRACE );
               trace.addWarning("Processing message Starts. Execute Method.");
               System.out.println("Processing message Starts. Execute Method.");
                 try
                 {
                 System.out.println("Processing message Starts. Execute Method.");
                 BufferedReader reader = new BufferedReader(new InputStreamReader(arg0));
                 StringBuilder sb = new StringBuilder();
                 String line = null;
                 while ((line = reader.readLine()) != null)
                  {    
                  arg1.write(line.getBytes());
                 arg1.write("\n".getBytes());
                 }
                 }
                 catch (Exception ex)
                  {
                   trace.addWarning("Could not process source message");
                   System.out.println("Could not process source message");
                   throw new RuntimeException(ex.getMessage());
                 }
          System.out.println("Processing completed successfully");
            
      }

      public static void main(String[] args)
      {
          try
          {       
           InputStream in = new FileInputStream(new File("K:/QueryOperation.xml"));     
           OutputStream out = new FileOutputStream(new File("K:/Output.xml"));      
           PassThrough myMapping = new PassThrough();
           myMapping.execute(in, out);
          }          
          catch (Exception e)
          {     
             e.printStackTrace();   
          }
      }

}

Regards

PS.

[markangelo_dihiansan]

Hello,

You need to read the input stream and write to output stream inside the execute method (not from the main) if you are testing inside XI. The main method is only used if you are testing your java mapping externally.

      public static void main(String[] args)
      {
          try
          {        
           InputStream in = new FileInputStream(new File("K:/QueryOperation.xml"));      
           OutputStream out = new FileOutputStream(new File("K:/Output.xml"));       
           PassThrough myMapping = new PassThrough();
           myMapping.execute(in, out);
          }           
          catch (Exception e)
          {      
             e.printStackTrace();    
          }
      }

Hope this helps,

Mark

[Former Member]

I am testing my code in external tool .

Eclipse .

[allamudi_loordh]

Hope you have added PI mapping jar files.

Regards,

Loordh

[Former Member]

Yes Added .

[Bhargavakrishna]

Hi Parabhat,

Refer below link

http://scn.sap.com/thread/1392993

http://scn.sap.com/thread/2037583

Regards

Bhargava krishna