Category: J2EE

How to handle HTTP 403 forbidden error in Java

Sometimes when trying to consume a web service from a java client, you get a 403 forbidden HTTP response code, even though the service is accessible normally from web browsers. The HTTP 403 forbidden error doesn’t necessarily occur due to missing authentication attributes, some web services would only authorize web browsers or some specific clients to access them, while they...

How to exclude a URL from a Filter

By default, filters doesn’t support excluding a specific URL pattern, whenever you define a URL pattern for a filter then any request matching this pattern is handled by the filter without exceptions. The simplest way for excluding URLs from a filter is to map your filter to a very specific pattern. This is feasible when done in early development stages,...

Deploy JAX-WS service on tomcat

This tutorial provides a step-by-step guide on how to build and deploy JAX-WS web service on Tomcat. Throughout this tutorial, we create a very simple SOAP web service and finally deploy it on Tomcat application server. Prerequisites: Eclipse IDE (Neon release) Java 1.8 Apache Tomcat 8 1. Create Maven web project Create a maven web project using this tutorial and name your...

Build SOAP service with JAX-WS

JAX-WS is an API used for building and consuming XML web services in Java, it was first released in Java EE5. In this tutorial, we provide a step-by-step guide on how to build SOAP web service with JAX-WS and finally publishing it using Endpoint built-in class. Prerequisites: Eclipse IDE (Neon release) Java 1.8 1. Create standalone Java project Open eclipse,...

Build REST web service using Spring

This tutorial provides a step-by-step guide on how to build REST web service using Spring framework. Prerequisites: Eclipse IDE (Mars release) Java 1.8 Apache tomcat 8  1. Create Maven web project Create a maven web project using this tutorial and name your project as SpringRestService. The structure of the generated project looks like the following: 2. Add Spring dependencies After creating...

Building REST web service using RESTEasy

RESTEasy is yet another popular framework which implements JAX-RS specification and is widely used for building REST web services in java. In this tutorial, we provide a step-by-step guide for building a REST web service using RESTEasy framework, we provide different ways to configure RESTEasy with both Servlet 3.0 and Servlet 2.0. If you’re interested in Jersey, check this tutorial. Prerequisites: Eclipse IDE...

Building REST web service using Jersey

Since Java 5, JAX-RS specification has been announced in order to support building REST web services according to the REST architectural pattern. JAX-RS is a set of interfaces or APIs which provides the building blocks for building REST services in java. Although you can’t build a fully functional RESTful service using these interfaces, there exists a lot of popular frameworks...

forward() vs sendRedirect() vs include()

It is a common practice that a controller redirects to another resource after processing a request, the resource could be either a view which displays the result of processing or even another controller which needs to do further processing on the request. In this tutorial, we explain the different ways of redirecting requests from servlet to another resource. Basically we...

Pass data from servlet to jsp

JSP is mostly used as the view component in any java-based MVC application, its main usage is to present dynamic data processed and generated from server-side controllers like servlet. In this tutorial, we explain the different ways of passing attributes/parameters from servlet to JSP, along with several examples specific for passing data types like: objects, arrays, lists and maps. 1....

Pass data from javascript to servlet

In modern web applications, the data exchange between front-end and back-end is usually done dynamically through javascript. In this tutorial, we explain 2 ways of exchanging data between javascript and java servlets, we also provide an example and business cases for the usage of each way. 1. Submit form programatically The first case is when you already have an html...