Displaying the user avatar

public class DemoUserImageURLProviderService { 
  public String getCurrentUserImageUrl() 
  { 
     // return the URL for profile Image of logged in user 
  } 
  public String getUserImageUrl(String principalOid) 
  { 
      // return the URL for profile Image for user represented by this principal Oid 
   } 
}

<component xmlns="http://adobe.com/idp/dsc/component/document"> 
    <component-id>com.adobe.sample.DemoUsersComponent</component-id> 
    <version>1.1</version> 
    <supports-export>false</supports-export> 
    <descriptor-class>com.adobe.idp.dsc.component.impl.DefaultPOJODescriptorImpl</descriptor-class> 
    <services> 
        <service name="DemoUserImageURLProviderService" title="Demo User ImageURL provider service" orchestrateable="false"> 
        <auto-deploy service-id="DemoUserImageURLProviderService" category-id="Demo Users Component DSC" major-version="1" minor-version="0" /> 
        <description>Service for resolving user image url.</description> 
         <specifications> 
         <specification spec-id="com.adobe.idp.taskmanager.dsc.enterprise.UserImageUrlProvider"/> 
         </specifications> 
        <specification-version>1.0</specification-version> 
        <implementation-class>com.adobe.sample.demousers.DemoUserImageURLProviderService</implementation-class> 
        <request-processing-strategy>single_instance</request-processing-strategy> 
        <supported-connectors>default</supported-connectors> 
        <operation-config> 
            <operation-name>*</operation-name> 
            <transaction-type>Container</transaction-type> 
            <transaction-propagation>supports</transaction-propagation> 
            <!--transaction-timeout>3000</transaction-timeout--> 
        </operation-config> 
        <operations> 
            <operation anonymous-access="false" name="getCurrentUserImageUrl" method="getCurrentUserImageUrl"> 
                <output-parameter name="result" type="java.lang.String"/> 
            </operation> 
            <operation anonymous-access="false" name="getUserImageUrl" 
method="getUserImageUrl"> 
            <input-parameter name="principalOid" type="java.lang.String"/> 
            <output-parameter name="result" type="java.lang.String"/> 
            </operation> 
        </operations> 
        </service> 
    </services>
</component>