By Mike Keith, Merrick Schincariol
ISBN-10: 1430249269
ISBN-13: 9781430249269
Professional JPA 2, second variation introduces, explains, and demonstrates how one can use the recent Java endurance API (JPA) 2.1 from the viewpoint of 1 of the specification creators. A unique source, it offers either theoretical and intensely useful assurance of JPA utilization for either starting and complex builders. Authors Mike Keith and Merrick Schincariol take a hands–on technique, in accordance with their wealth of expertise and services, via giving examples to demonstrate every one thought of the API and displaying the way it is utilized in perform. The examples use a standard version from an overriding pattern program, giving readers a context from which to begin and aiding them to appreciate the examples inside of an already widespread area. After finishing the publication, you could have an entire knowing of JPA and have the ability to effectively code purposes utilizing its annotations and APIs.
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Extra info for Pro JPA 2, 2nd Edition
Sample text
In this example, that means all access to the bean is serialized so that only one client is invoking a business method on the instance at any time. The lifecycle of the singleton session bean is tied to the lifecycle of the overall application. The container determines the point when the singleton instance gets created unless the bean class is annotated with the @Startup annotation to force eager initialization when the application starts. The container can create singletons that do not specify eager initialization lazily, but this is vendor-specific and cannot be assumed.
When transactions start, when they end, and how the entity manager participates in container-managed transactions are all essential topics for developers using JPA.
The PostActivate method is identified by the @PostActivate marker annotation. Listing 3-6 shows a session bean that makes full use of the lifecycle callbacks to maintain a JDBC connection. Note that only the JDBC Connection is explicitly managed. As a resource connection factory, the server automatically saves and restores the data source during passivation and activation. Listing 3-6. Using Lifecycle Callbacks on a Stateful Session Bean @Stateful public class OrderBrowser { DataSource ds; Connection conn; @PostConstruct void init() { // acquire the data source // ...
Pro JPA 2, 2nd Edition by Mike Keith, Merrick Schincariol
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