By Holly Cummins, Timothy Ward
Enterprise OSGI in Action is a hands-on consultant for builders utilizing OSGi to construct the following iteration of company Java functions. via proposing correct examples and case reports, this booklet courses the reader in the course of the maze of latest criteria and projects.
About This Book
Enterprise OSGi is a collection of criteria for development modular Java purposes which combine seamlessly with latest Java EE applied sciences. It extends the OSGi part framework to dispensed systems.
Enterprise OSGi in Action is a hands-on consultant for builders utilizing OSGi to construct company Java functions. Many examples and case reports provide help to construct, try out, and set up modular net purposes. The booklet explains how one can reap the benefits of dynamism, distribution, and automated dependency provisioning, whereas nonetheless integrating with present Java EE applications.
The publication is written for Java EE builders. No previous event with OSGi is required.
* construct modular functions utilizing servlets, JSPs, WARs, and JPA
* larger part reuse and robustness
* professional assistance for Apache Aries
Purchase of the print publication incorporates a unfastened book in PDF, Kindle, and ePub codecs from Manning Publications.
About the Authors
Holly Cummins and Tim Ward are lead engineers who usually converse at developerWorks, Devoxx, JavaZone, and EclipseCon. Tim has written criteria in either the OSGi middle and company standards and either authors are energetic Apache Aries committers.
Table of Contents
PART 1 PROGRAMMING past hi global
* OSGi and the enterprise—why now?
* constructing an easy OSGi-based internet application
* patience will pay off
* Packaging what you are promoting OSGi applications
PART 2 construction larger company OSGI APPLICATIONS
* top practices for firm applications
* development dynamic purposes with OSGi services
* Provisioning and resolution
* instruments for development and testing
* IDE improvement tools
PART three INTEGRATING company OSGI WITH every thing ELSE
* Hooking up distant platforms with disbursed OSGi
* Migration and integration
* dealing with the non-OSGi world
* deciding on a stack
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Additional resources for Enterprise OSGi in Action: With examples using Apache Aries
Writing database access code isn’t much fun, so persistence providers supply a nicer set of interfaces to manage the interaction between the application code and the database. This is a business application, and so transactions are usually involved—either buying and selling of goods and services, or some other business agreements. To ensure these “real” transactions proceed smoothly and consistently, even in the event of a communications problem, software transactions are used. With all this going on, these enterprise applications are starting to get pretty complex.
If you don’t specify a range, then your import runs to infinity, meaning that your bundle expects to be able to use any version of the package, regardless of how it changes! It’s good practice to always specify a range, using square brackets for inclusive or parentheses for exclusive versions. 1 would be compatible up to, but not including, version 2. Coexistence of implementations The most significant benefit provided by versioning is that it allows different versions of the same module or package to coexist in the same system.
One application will run with the version it expects, and the other won’t. In some cases, the “losing” application may terminate with a NoSuchMethodError because it invokes methods that no longer exist. In other, worse cases, there will be no obvious exceptions but the application won’t behave correctly. These issues are incredibly unpleasant and in Java have been given the rather self-explanatory name classpath hell. Although classpath hell is a bad problem in core Java, it’s even more pernicious in the enterprise Java domain.