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java.lang.NullPointerException returned from webservice

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John McCosker

Posts: 1
Nickname: jpmac
Registered: Aug, 2004

java.lang.NullPointerException returned from webservice

Posted: Aug 5, 2004 2:23 AM

Hi I have an axis client which sends an image attachment to an axis webservice, however I am returned with a null pointer exception,

this is my client,

package chapter5;

import java.net.URL;

import org.apache.axis.client.Service;
import org.apache.axis.client.Call;
import org.apache.axis.encoding.XMLType;
import org.apache.axis.encoding.ser.JAFDataHandlerSerializerFactory;
import org.apache.axis.encoding.ser.JAFDataHandlerDeserializerFactory;

import javax.xml.rpc.ParameterMode;
import javax.xml.rpc.namespace.QName;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;

public class AttachmentServiceClient{

public AttachmentServiceClient(){}

public static void main(String args[]){
try{
String filename = "D:\\images\\products\\r.jpg";
//create the data for the attached file
DataHandler dhSource = new DataHandler(new FileDataSource(filename));
String endpointURL = "http://localhost:8080/axis/services/AttachmentService";
String methodName = "addImage";

Service service = new Service();
Call call = (Call)service.createCall();
call.setTargetEndpointAddress(new URL(endpointURL));
call.setOperationName(new QName("AttachmentService",methodName));
call.addParameter("sku",XMLType.XSD_STR ING,ParameterMode.PARAM_MODE_IN);
QName qname = new QName("AttachmentService","DataHandler");
call.addParameter("image",qname,Param eterMode.PARAM_MODE_IN);
//register the datahandler
call.registerTypeMapping(dhSource.getClass(),qname,JAFDataHandlerSe rializerFactory.class,JAFDataHandlerDeserializerFactory.class);
call.setReturnTy pe(XMLType.XSD_STRING);

Object[] params = new Object[]{"SKU-111",dhSource};
String result = (String)call.invoke(params);

System.out.println("The response: "+result);
; }catch(Exception e){
System.err.println(e.toString());
}
}

}

this is my webservice,

package chapter5;

import javax.activation.DataHandler;

import java.io.FileOutputStream;
import java.io.File;
import java.io.BufferedInputStream;

public class SparePartAttachmentService{

public SparePartAttachmentService(){}

public String addImage(String sku,DataHandler dataHandler){
System.out.println("trying");
try{
String filepath = "c:/wrox-axis/"+sku+"-image.jpg";
FileOutputStream fout = new FileOutputStream(new File(filepath));
BufferedInputStream in = new BufferedInputStream(dataHandler.getInputStream());
while(in.available()!=0){
fo ut.write(in.read());
}
}catch(Exception e){
return e.toString();
}
return "Image: "+sku+" has been added successfully!!";
}

}

I did a test by stripping out the attachment being sent by the client and just let it send the string,
then in the webservice I stripped out the lines for the attachment and just returned the string and it worked ok, so it has been deployed correctly.

I have the Java Activation framework both in tomcat commons and my webapps lib dir.

I'm pretty sure the error is being thrown here,
public String addImage(String sku,DataHandler dataHandler){

I f need to supply more information let me know,

any help would be greatly appreciated,
thank you,
JP.

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