Latest Articles

Java EE CDI dependency disambiguation example

01 June 2013

In this tutorial you will learn how to inject multiple interface implementations with Java EE CDI (dependency disambiguation) avoiding org.jboss.weld.exceptions.DeploymentException: WELD-001409 Ambiguous dependencies for type [...] with qualifiers [...] at injection point [...]

In Java EE CDI it is possible to provide multiple implementations of a given interface - or service - to the service clients. The client should then be responsible for selecting the desired service im... Read more

Java EE CDI Dependency Injection (@Inject) tutorial

25 May 2013

In this tutorial you will learn about the different ways to use @Inject annotation in order to perform Dependency Injection with Java EE CDI.

Java EE CDI makes primarily use of the @Inject annotation in order to perform Dependency Injection of managed beans into other container managed resources. In this tutorial we will cover the different... Read more

cdi java java-ee

Java EE CDI beans deployed in external library (WEB-INF/lib JAR file)

20 May 2013

In this tutorial we will see how to deploy CDI beans contained in an external JAR file avoiding org.jboss.weld.exceptions.DeploymentException: WELD-001408 Unsatisfied dependencies for type [...] with qualifiers [@...] at injection point ... exception.

One of the objectives of the beans.xml file in a CDI application is to notify the container where to search for CDI managed beans. In this short tutorial we will see how to configure a JAR file - cont... Read more

cdi configuration java java-ee

Modal dialog (popup) from Android widget example

11 May 2013

In this tutorial you will learn how to open a modal popup (or dialog) from an Android home screen widget.

Android widgets only contain a subset of the available UI components and functionality when compared to Android activities. This means that if we have a requirement that needs something a bit more sop... Read more

android java widget

Java EE CDI Disposer methods example

04 May 2013

In this tutorial you will learn how to use CDI Disposer methods in order to perform clean up of resources created by CDI Producer methods.

CDI Producer methods may be used to create resources that are consumed by an application in a very specific context. These resources may need to be cleaned up by the container when the application doe... Read more

cdi java java-ee

Java EE CDI Producer methods tutorial

27 April 2013

In this tutorial you will learn how to use CDI Producer methods in order to provide a flexible bean initialization mechanism. Concepts like polymorphism, disambiguation and CDI scopes will also be discussed as we proceed in the tutorial.

Java EE CDI introduced a concept called Producer. Producers may be used to create - or produce - bean instances to be consumed by an application. Producers are also able to provide specific interface ... Read more

cdi java java-ee

Java EE CDI ConversationScoped example

13 April 2013

In this tutorial you will learn how to use ConversationScoped CDI beans.

As we have seen previously on Java EE CDI bean scopes CDI provides a set of available built-in bean scopes. One of these scopes is the Conversation scope. In this tutorial we will see how this scope c... Read more

cdi java java-ee tomcat web

Java EE CDI bean scopes

06 April 2013

In this tutorial you will learn in detail about the distinct bean scopes provided by CDI and how to use them.

When a managed bean is initialized by CDI the bean will be initialized in a very specific scope. The scope in which the bean is initialized will determine its lifecycle. CDI provides the following bea... Read more

cdi java java-ee

About the author

Gonçalo Marques is a Software Engineer with several years of experience in software development and architecture definition. During this period his main focus was delivering software solutions in banking, telecommunications and governmental areas. He created the Bytes Lounge website with one ultimate goal: share his knowledge with the software development community. His main area of expertise is Java and open source.

GitHub profile: https://github.com/gonmarques

He is also the author of the WiFi File Browser Android application: