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JavaOne 2015 Session: EJB 3.2/JPA 2.1 Best Practices with Real-Life Examples by Gohar

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I have recently watched my friend Ahmed Nabil Gohar's session at JavaOne 2015. It's really a clear and straight to the point session. I'm sharing with you the sessions details (inluding the YouTube + the presentation downloadable link) as mentioned in his post.
Session ID: CON7535
Session Title: EJB 3.2/JPA 2.1 Best Practice with life examples (Download Link)
Session Type: Conference Session
Session Abstract:
This session’s speaker, an architect, discusses lessons learned from using JPA and EJB to support a high-volume, high-performance applications. These best practices don't only involve JPA/EJB but also its integration with other Java EE 7 technologies. They also include coding best practices, testing and production practices. The presentation focuses primarily on some Key concepts such as persistence context, lazy loading, caching, flushing, dirty checking, transaction and connection demarcation. This is a fast-paced presentation with many code samples. Categories…
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PrimeFaces Push with Atmosphere

PrimeFaces Push is based on Atmosphere to establish WebSocket communication in an easy way. Bellow I will share the configuration to be able to do such kind of communication.
1- Adding the PrimeFaces and Atmosphere to the pom.xml for Maven dependency. Also, I added the dependency of the Apache Commons Lang3 to use the StringEscapeUtils while sending the notification message.
<dependency> <groupId>org.atmosphere</groupId> <artifactId>atmosphere-runtime</artifactId> <version>2.1.7</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.4</version> </dependency> <dependency> <groupId>org.primefaces</groupId> <artifactId>primefaces</artifactId> <version>5.0</version> </dependency> 2- The web.xml configuration for the push servlet.
<?xml version="1.0" encod…
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Spring Core - Different Types of Bean Injection

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1. Overview Dependency Injection is a very common technique in software engineering whereby an object supplies the dependencies of another object. Means that DI is about passing a dependency object to another a dependent object.
Assume we have a client and a service that would be used by the client. We pass the service to the client rather than allowing the client to build it. DI is commonly related to a wide known taxonomy which is Inversion of control aka IoC. But simply, IoC is a more general than the DI. IoC means letting the other code call you rather than insisting od doing the calling.
All of this is managed through the Spring Container which requires some sort of configurations that are presented through XML-based configuration or Annotation-based configuration. We will focus on the Annotation-based one in the below subjects.
2. Maven Configuration We need to make sure that Spring core and JUnited dependencies exists in our pom.xml
<properties> <!-- Spring --> &…
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