Skip to main content

Calling Synchronous WebServices Asynchronously from ADF Managed Bean

Recently I had to implement a SOAP webservice call from a af:commandButton action, but the requirement was to make it an asynchronous call. So that the user doesn't have to wait till the Webservice finish processing the request.

So I built :
  1. Interface which extends java.util.concurrent.Callable.
    • Interface so that I can use the same technique to call multiple Webservices, if required.
  2. A session scoped bean to invoke the above interface.
#1. Interface : WebserviceCallee

public interface WebserviceCallee<T> extends Callable<Boolean> {

    // Base URL of the Webservice to call
    public String getBaseUrl();
    public void setBaseUrl(String baseUrl);

    // To identify this object uniquely    
    public String getUniqueIdentifier();

#2. Implentation :  

public class WebServiceA implements WebserviceCallee<Boolean> {
    private static Log log = LogFactory.getLog(
    private String baseUrl;
    private Thread thread;

    private MyCustomObject myCustomObject;

WebServiceA(MyCustomObject myCustomObject) {
         this.myCustomObject = myCustomObject;
         this.thread = Thread.currentThread();

    public Boolean call() {
        Boolean callResult = Boolean.FALSE;

        return callResult;

    public String getUniqueIdentifier() {
        return "
WebServiceA call for : " + myCustomObject.getUniqueID();

    public void setBaseUrl(String baseUrl) {
        this.baseUrl = baseUrl;

    public String getBaseUrl() {
        return baseUrl;

#3. Session Scoped Bean : ExecutionService

public class ExecutionService {
    private static Log log = LogFactory.getLog(ExecutionService.class);
    private final ExecutorService executorService = Executors.newCachedThreadPool();
    Map<String, Future<Boolean>> submittedTasks = new SubmittedTaskMap<>();
    public ExecutionService() {
    public static ExecutionService getInstance() {
        return (ExecutionService) JsfUtils.getExpressionValue("#{ExecutionService}");
    public void submitCallables(WebserviceCallee<Boolean> webserviceCallee) {
        log.debug("thread spawnned for :" + webserviceCallee.getCalleeIdentity());
        Future<Boolean> future = executorService.submit(webserviceCallee);
        try {
            log.debug("thread result :" + future.get());
        } catch (ExecutionException e) {
        } catch (InterruptedException e) {
        submittedTasks.put(webserviceCallee.getWorkorderNumber(), future);

    public Map<String, Future<Boolean>> getSubmittedTasks() {
        return submittedTasks;
     * Custom HashMap implementation to track the threads spawnned by WebService calls
     * @param <K>
     * @param <V>
    public class SubmittedTaskMap<K,V> extends HashMap<String, Future<Boolean>> {
        public SubmittedTaskMap() {
         * @param key
         * @return NULL if the thread has finished executing
        public Future<Boolean> get(Object key) {
            Future<Boolean> submittedTask = super.get(key);
            if(submittedTask != null) {
                if(submittedTask.isDone()) {
                    return null;
            return submittedTask;

adfc-config.xml :
  <managed-bean id="es1">
    <managed-bean-name id="es2">ExecutionService</managed-bean-name>
    <managed-bean-class id="es3">my.bean.ExecutionService</managed-bean-class>
    <managed-bean-scope id="es4">session</managed-bean-scope>

#4. To invoke from ADF managed bean :

        WebServiceA webServiceA = new WebServiceA(myCustomObject);
        String baseUrl = ContextUtil.getContextProperty(FacesContext.getCurrentInstance(), WSBASEURL);

This technique can also be used as a Singleton implementation. Just make the "ExecutionService" class Singleton. 
Please be aware about the thread usage and implementation, I have used "newCachedThreadPool" of Executors, please consult the documentation of  "java.util.concurrent.Executors" before implementing.


Popular posts from this blog

Chatbots and Oracle Cloud Services

Thanks to Oracle A-Team, I had a chance to work with Chatbots.
3 pure NodeJS applications, on couple of Oracle Cloud platforms and Facebook messenger, and my chatbot was running.

Let me explain, the architecture a bit. To start with, following is the simple representation of how it works.

Exception Handling in ADF

This blog will give you an overview on how you can successfully deal with unhandled Runtime exceptions in an ADF application.

This will give you an idea of:
How to catch the unhandled exceptions.Write a separate log file with stacktrace and thread dumps.Redirect the user to an static error page
#1. Catch unhandled exceptions : 

Create a class "MyExceptionHandler" which extends : Override handleException() method.

public void handleException(FacesContext facesContext, Throwable throwable, PhaseId phaseId) throws Throwable {
        // this method is going to create a separate file with stacktrace and thread dumps
        // redirect to error page

 Create a folder "services" inside : ViewController\src\META-INF and then create a file named "".
In the file, add the absolute name of your custom e…

Secure your Node/Express REST APIs using Passport JS

Recently I have been involved in various discussions on how to make the REST APIs as secure as SOAP.
First of all, let me start with a very basic statement, about security, it doesn't depend on your Webservice type, be it REST or SOAP, your design decisions depicts whether they can be made secure or not.
In this example blog, I will use "Micro CRUD services for Oracle Database Cloud" APIs and implement (read attach) Passport's "local" authentication strategy, to make them secure.

Code in Github : LeasifyAPIs with Passport

What is Passport JS? (from Documentation)

Passport is authentication middleware for Node. It is designed to serve a singular purpose: authenticate requests. When writing modules, encapsulation is a virtue, so Passport delegates all other functionality to the application. This separation of concerns keeps code clean and maintainable, and makes Passport extremely easy to integrate into an application.

What are "strategies" in P…