Beginning Java EE 7 - download pdf or read online

By Antonio Goncalves

ISBN-10: 1430246278

ISBN-13: 9781430246275

Java firm variation (Java EE) remains to be one of many prime Java applied sciences and systems. starting Java EE 7 is the 1st educational publication on Java EE 7.

Step by way of step and straightforward to persist with, this e-book describes some of the Java EE 7 requisites and reference implementations, and indicates them in motion utilizing functional examples. This definitive ebook additionally makes use of the latest model of GlassFish to installation and administer the code examples.

Written via a professional member of the Java EE specification request and assessment board within the Java group technique (JCP), this publication comprises the simplest info attainable, from an expert’s point of view on firm Java applied sciences.

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One way to avoid the multiplication of annotations is to use members. In our example we could replace all these qualifiers by using the single qualifier @NumberOfDigits with an enumeration as a value and a Boolean for the parity (see Listing 2-13). Listing 2-13. The @NumberOfDigits with a Digits Enum and a Parity Boolean @Qualifier @Retention(RUNTIME) @Target({FIELD, TYPE, METHOD}) public @interface NumberOfDigits { Digits value(); boolean odd(); } public enum Digits { TWO, EIGHT, TEN, THIRTEEN } 35 Chapter 2 ■ Context and Dependency Injection The manner in which you would use this qualifier with members doesn’t change from what you’ve seen so far.

When the bean is instantiated by the container, the logMethod() will be invoked prior to the init() method. Then, if a client calls createCustomer() or findCustomerById(), the profile() method will be invoked. Listing 2-27. class) public class CustomerService { @Inject private EntityManager em; @PostConstruct public void init() { // ... class, id); } } Chaining and Excluding Interceptors You’ve seen how to intercept calls within a single bean (with @AroundInvoke) and across multiple beans (using @Interceptors).

In Listing 2-11 the BookService explicitly defines the 13-digit implementation by injecting a reference of the @ThirteenDigits number generator and in Listing 2-12 the LegacyBookService injects the 8-digit implementation. Listing 2-11. generateNumber()); return book; } } 34 Chapter 2 ■ Context and Dependency Injection Listing 2-12. generateNumber()); return book; } } For this to work you don’t need external configuration; that’s why CDI is said to use strong typing. You can rename your implementations to whatever you want, rename your qualifier—the injection point will not change (that’s loose coupling).

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