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Spring Roo in Action is an insightful and comprehensive treatment of Spring Roo. Velocity, FreeMarker, or even using PDF or Excel. Spring. Spring Roo in Action is a unique book that teaches you how to code Java in Roo, with a particular focus on Spring-based applications. Through hands-on. In the last chapter, we discussed Spring Roo from a developer's perspective. We discussed the various component types, and how the Roo shell creates and.
It enables the developer to build best-practice, high-quality, lock-in-free enterprise applications in minutes — a task that would otherwise take days if not weeks. Developers using Roo can fundamentally and sustainably improve their productivity without compromising engineering integrity or flexibility. Roo is highly modular: it allows developers to extend its functionality by installing new add-ons in a secure and trusted way. You can load the Spring Roo shell in the background and let it monitor your project or directly interact with it by issuing shell commands. The shell offers many usability features such as tab completion, context awareness, help and hinting support and automatic roll-back. Roo even keeps a log of your shell commands so you can easily replay them if desired.
Objects can be obtained by means of either dependency lookup or dependency injection.
Dependency injection is a pattern where the container passes objects by name to other objects, via either constructors , properties , or factory methods. In many cases one need not use the container when using other parts of the Spring Framework, although using it will likely make an application easier to configure and customize. The Spring container provides a consistent mechanism to configure applications and integrates with almost all Java environments, from small-scale applications to large enterprise applications.
Some[ who? Similarly services and components are not called directly; instead a Spring configuration file defines which services and components must be called. This IoC is intended to increase the ease of maintenance and testing.
Aspect-oriented programming framework[ edit ] The Spring Framework has its own Aspect-oriented programming AOP framework that modularizes cross-cutting concerns in aspects.
The motivation for creating a separate AOP framework comes from the belief that it should be possible to provide basic AOP features without too much complexity in either design, implementation, or configuration.
The Spring AOP framework is proxy pattern-based , and is configured at run time. This removes the need for a compilation step or load-time weaving.
On the other hand, interception only allows for public method-execution on existing objects at a join point.
Spring 1. Spring 2.
Further, Spring 2. Spring AOP has been designed to make it able to work with cross-cutting concerns inside the Spring Framework. Any object which is created and configured by the container can be enriched using Spring AOP. Since version 2.
Data access framework[ edit ] Spring's data access framework addresses common difficulties developers face when working with databases in applications. For all of these supported frameworks, Spring provides these features Resource management - automatically acquiring and releasing database resources Exception handling - translating data access related exception to a Spring data access hierarchy Transaction participation - transparent participation in ongoing transactions Resource unwrapping - retrieving database objects from connection pool wrappers Abstraction for binary large object BLOB and character large object CLOB handling All these features become available when using template classes provided by Spring for each supported framework.
Critics have said these template classes are intrusive and offer no advantage over using for example the Hibernate API directly.
This however requires transparent transaction management, as application code no longer assumes the responsibility to obtain and close database resources, and does not support exception translation. Together with Spring's transaction management, its data access framework offers a flexible abstraction for working with data access frameworks.
The Spring Framework is the only framework available in Java that offers managed data access environments outside of an application server or container. ComboPooledDataSource or org. Transaction semantics of AOP advice[ clarify ]. Transaction management[ edit ] Spring's transaction management framework brings an abstraction mechanism to the Java platform.
Its abstraction is capable of: working with local and global transactions local transaction does not require an application server working with savepoints working in almost all environments of the Java platform In comparison, Java Transaction API JTA only supports nested transactions and global transactions, and requires an application server and in some cases also deployment of applications in an application server.
The Spring Framework ships a PlatformTransactionManager for a number of transaction management strategies: Transactions managed on a JDBC Connection Transactions managed on Object-relational mapping Units of Work Transactions managed via the JTA TransactionManager and UserTransaction Transactions managed on other resources, like object databases Next to this abstraction mechanism the framework also provides two ways of adding transaction management to applications: Programmatically, by using Spring's TransactionTemplate Configuratively, by using metadata like XML or Java annotations Transactional, etc.
Together with Spring's data access framework — which integrates the transaction management framework — it is possible to set up a transactional system through configuration without having to rely on JTA or EJB. The transactional framework also integrates with messaging and caching engines.
The Spring developers decided to write their own Web framework as a reaction to what they perceived as the poor design of the then popular Jakarta Struts Web framework,  as well as deficiencies in other available frameworks. In particular, they felt there was insufficient separation between the presentation and request handling layers, and between the request handling layer and the model. SlideShare Explore Search You. Submit Search. Successfully reported this slideshow.
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