Latest Articles

Java EE EJB concurrency (ConcurrencyManagement, Lock and LockType)

31 May 2015

This article will cover EJB concurrent access configuration (both container and bean managed) resorting to Lock, LockType and ConcurrencyManagement primitives.

Even though Stateless EJB's may never be concurrently accessed by more than a single client call, this article would be otherwise incomplete if it did not mention this kind of EJB's. Stateless EJB's a... Read more

JPA EXTENDED Persistence Context

19 April 2015

In this article we will cover the differences between TRANSACTION and EXTENDED Persistence Context (Entity Manager).

A container managed Persistence Context is always associated with a specific scope among the following available scopes: TRANSACTION or EXTENDED. The more common scenario is the TRANSACTION scope, whi... Read more

ejb java-ee jpa

EJB multiple datasource transaction example

08 May 2014

In this article we will see how to configure EJB transactions across multiple datasources

Sometimes we may need our EJB transactions to spawn across multiple datasources. For this to be possible one must take advantage of the enterprise container Transaction Manager and the Java transactio... Read more

ejb java-ee jpa jta xa

EJB passivation and activation example

05 August 2013

In this tutorial we will cover Java EE Stateful Session Bean passivation and activation mechanism.

Stateful Session Beans are usually coupled with some given client and - as the name states - they keep state across client invocations.Since a conversation with a client may be long-lived, and many si... Read more

activation ejb java java-ee passivation stateful

Java EE Stateful Session Bean (EJB) example

31 July 2013

In this tutorial we will see how to create a simple Stateful Session Bean (EJB) and use it in a web application context, more precisely a Java Servlet.

Stateful Session Beans - as the name states (and opposite to Stateless Session Beans) - are able to keep state across multiple calls from a given client during an established session.A Stateful EJB is... Read more

ejb java java-ee stateful

Java EE EJB transaction propagation (@TransactionAttribute) tutorial

08 July 2013

In this tutorial we will see the available transaction propagation behaviours provided by the EJB container using @TransactionAttribute annotation.

While dealing with Container Managed Transactions (CMT) in EJB, the application developer is able to declaratively define how an arbitrary call to an EJB method should behave in terms of transaction p... Read more

ejb java java-ee jpa jta tx

Java EE EJB Interceptors tutorial and example

30 June 2013

In this tutorial you will learn how to configure EJB Interceptors used to - as the name states - intercept calls to EJB methods.

Interceptors - as the name states - are components that intercepts calls to EJB methods. They may be used - for example - to implement an auditing / logging system around calls to EJB.Another usage ex... Read more

ejb interceptors 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: