Null Pointer exception for a reference while consuming Rest service in Bean - Switchyard Project

[ramandeep]

Hi Guys ,

I need some help I am facing  a Null pointer exception in the bean class where I am consuming a Rest Service . Below is my Bean class .

import javax.inject.Inject;

import org.switchyard.component.bean.Reference;

import org.switchyard.component.bean.Service;

import org.apache.log4j.Logger;

import org.codehaus.jettison.json.JSONObject;

@Service(InvoiceGet.class)

public class InvoiceGetBean implements InvoiceGet {

private static final Logger LOGGER = Logger.getLogger(InvoiceGetBean.class);

@Inject

@Reference

private FXReference restService;

public JSONObject InvoiceDetailGet(String searchInfo) throws Exception {

LOGGER.info("Getting Invoice details: ");

           String BillRefNo = HelperUtil.getXpathValue(searchInfo, "/InvoiceDetails/BillRefNo");

        String BillRefResets = HelperUtil.getXpathValue(searchInfo, "/InvoiceDetails/BillRefResets");

        String BillInvoiceRow = HelperUtil.getXpathValue(searchInfo, "/InvoiceDetails/BillInvoiceRow");

        String LanguageCode = HelperUtil.getXpathValue(searchInfo, "/InvoiceDetails/LanguageCode");

        LOGGER.info("BillRefNo is: "+BillRefNo +"BillRefResets is: "+BillRefResets + "BillInvoiceRow is:  "+BillInvoiceRow + "LanguageCode is:  "+LanguageCode);

           String token = null;

           JSONObject jsonObj = null;

           token="Basic YXJib3JzdjprZW5hbmZ4";

           InvoiceRequestDetails invoicedet = new InvoiceRequestDetails(BillRefNo, BillRefResets, BillInvoiceRow, LanguageCode,token);

           String DetailInvoice = restService.InvoiceDetailGet(invoicedet);

and here is the interface declaration :-

While Consuming  Rest service the reference restService is NULL in below line.

  String DetailInvoice = restService.InvoiceDetailGet(invoicedet);

please find my Switchyard.xml below

<?xml version="1.0" encoding="UTF-8"?>
<sy:switchyard xmlns:bean="urn:switchyard-component-bean:config:2.0" xmlns:camel="urn:switchyard-component-camel:config:2.0"        
    xmlns:resteasy="urn:switchyard-component-resteasy:config:2.0" xmlns:sca="http://docs.oasis-open.org/ns/opencsa/sca/200912" xmlns:sy="urn:switchyard-config:switchyard:2.0" name="switchyard-example1" targetNamespace="urn:com.example.switchyard:switchyard-example1:1.0">
  <sca:composite name="KC1_Rest" targetNamespace="urn:com.example.switchyard:switchyard-example1:1.0">
    <sca:component name="KC1Route">
      <camel:implementation.camel>
        <camel:java class="com.example.switchyard.KC1_Rest.CamelServiceRoute"/>
      </camel:implementation.camel>

      <sca:service name="InvoiceService">
        <sca:interface.java interface="com.example.switchyard.KC1_Rest.InvoiceService"/>
      </sca:service>

      <sca:reference name="InvoiceGet">
        <sca:interface.java interface="com.example.switchyard.KC1_Rest.InvoiceGet"/>
      </sca:reference>
    </sca:component>

    <sca:service name="InvoiceService" promote="KC1Route/InvoiceService">
      <sca:interface.java interface="com.example.switchyard.KC1_Rest.InvoiceService"/>
      <resteasy:binding.rest name="rest1">
        <sy:operationSelector operationName="getInvoiceDetails"/>
        <resteasy:messageComposer class="com.example.switchyard.gc1_Rest.CustomComposer"/>
        <resteasy:interfaces>com.example.switchyard.KC1_Rest.KC1UserInterface</resteasy:interfaces>
        <resteasy:contextPath>fx_rest</resteasy:contextPath>
      </resteasy:binding.rest>
    </sca:service>

    <sca:component name="InvoiceGetBean">
      <bean:implementation.bean class="com.example.switchyard.KC1_Rest.InvoiceGetBean"/>
      <sca:service name="InvoiceGet">
        <sca:interface.java interface="com.example.switchyard.KC1_Rest.InvoiceGet"/>
      </sca:service>
      <sca:reference name="FXReference">
        <sca:interface.java interface="com.example.switchyard.KC1_Rest.FXReference"/>
      </sca:reference>
    </sca:component>

    <sca:reference name="FXReference" multiplicity="0..1" promote="InvoiceGetBean/FXReference">
      <sca:interface.java interface="com.example.switchyard.KC1_Rest.FXReference"/>
      <resteasy:binding.rest name="rest2">
        <sy:operationSelector operationName="InvoiceDetailGet"/>
        <resteasy:messageComposer class="com.example.switchyard.KC1_Rest.CustomComposer"/>
        <resteasy:interfaces>com.example.switchyard.KC1_Rest.FXRestServiceResource</resteasy:interfaces>
        <resteasy:address>http://${restHost}:${restPort}/${restPath}</resteasy:address>
        <resteasy:contextParams>
            <resteasy:contextParam name="resteasy.providers" value="com.KC1Integration.MyClientExecutionInterceptor"/>
            <resteasy:contextParam name="resteasy.client.error.interceptors" value="com.Integration.MyClientErrorInterceptor"/>
        </resteasy:contextParams>
     </resteasy:binding.rest>

....

Could someone please let me know what am I missing here ? Why the restService object is coming as NULL. ?

Thanks

Raman