Beginning Java EE 7 by Antonio Goncalves

By Antonio Goncalves

Java company version (Java EE) remains to be one of many top Java applied sciences and systems. Beginning Java EE 7 is the 1st educational publication on Java EE 7.

step-by-step and simple to persist with, this booklet describes the various Java EE 7 requisites and reference implementations, and exhibits them in motion utilizing useful examples. This definitive e-book additionally makes use of the most recent model of GlassFish to install and administer the code examples.

Written by means of a professional member of the Java EE specification request and overview board within the Java group method (JCP), this booklet includes the simplest info attainable, from an expert's point of view on firm Java technologies.

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Extra resources for Beginning Java EE 7

Sample text

Conversation The conversation scope is slightly different than the application, session, or request scope. It holds state associated with a user, spans multiple requests, and is demarcated programmatically by the application. A @ConversationScoped bean can be used for a long-running process where there is a definite beginning and end such as navigating through a wizard or buying items and checking out of an online store. Request scoped objects have a very short life span that usually lasts for a single request (HTTP request or method invocation) while session scoped objects last for the entire duration of the user’s session.

Multiple Qualifiers Another way of qualifying a bean and an injection point is to specify multiple qualifiers. So instead of having multiple qualifiers for parity (@TwoOddDigits, @TwoEvenDigits . ) or having a qualifier with members (@NumberOfDigits), we could have used two different set of qualifiers: one set for the parity (@Odd and @Even) and another one for the number of digits. This is how you could qualify a generator of 13 even digits. } The injection point would use the same syntax. @Inject @ThirteenDigits @Even private NumberGenerator numberGenerator; Then only a bean that has both qualifier annotations would be eligible for injection.

This gives you loose coupling (as the implementation class of the interceptor is not explicitly stated) and a nice level of indirection.

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