distinguishing barcode scanners from the keyboard in winforms

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In this chapter, you have learned how to expose and invoke remote services with Spring s remoting support. Spring builds in support for many remoting technologies, such as RMI, Hessian, Burlap, and HTTP Invoker. Although Spring doesn t come with similar support for web services, there s an external library called XFire that does. Spring s remoting support is consistent across different remoting technologies. On the server side, Spring allows you to expose an arbitrary bean as a remote service through a service exporter. On the client side, Spring provides various proxy factory beans for you to create a local proxy for a remote service, so that you can use the remote service as if it were a local bean.

Many of the JDBC APIs declare throwing java.sql.SQLException, a checked exception that must be caught. It s very troublesome to handle this kind of exception every time you perform a database operation. You often have to define your own policy to handle this kind of exception. Failure to do so may lead to inconsistent exception handling.

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Experience with enterprise application frameworks is similar; these frameworks are so extensive that different projects that use the same framework may well use totally different parts of it Whatever a developer was working on even three to four years ago is unlikely to be of any direct use today So what use is an experienced developer Is it true that every significant new piece of software is written by developers who are essentially novices to the task It s true that long lists of desired technology skills, which are so prevalent in IT job advertisements, are virtually useless The bulk of the technical knowledge required for a project will normally be learned on the job However, the softer skills that make one a good developer, or even a good team leader or architect, do apply from one project to the next, and can accumulate over time.

You have also learned the benefits of contract-first web services and how to develop them with Spring-WS. The first step is to define the service contract, which consists of two parts: the data contract and the service contract. The data contract is defined with XSD while the service contract is defined with WSDL. You have to define the XSD file by yourself, and then the WSDL file can be generated from it. Once you have defined the contract for your web service, you can start implementing the service itself according to this contract. Service requests are handled by endpoints, which are similar to controllers in a web application. You can implement an endpoint by using an XML parsing or XML marshalling technology. According to the contract of a web service, you can create a service client to invoke this service. You can also implement a service client using an XML parsing or an XML marshalling technology. In the next chapter, you will learn about Spring s support for two key Java EE technologies: EJB and JMS.

n this chapter, you will learn about Spring s support for two key Java EE technologies: EJB (Enterprise JavaBeans) and JMS (Java Message Service) EJB is the core technology of the Java EE platform, which allows you to create components that leverage the enterprise services provided by an EJB container However, before the announcement of EJB 30, many developers preferred to develop their applications with POJOs due to the complexity of EJB 2x Spring integrates both the EJB and POJO approaches by using its POJO-based IoC container to simplify the implementation of EJB 2x components Although you may not like EJB 2x very much, it s possible for you to access EJB 2x components developed by someone else Accessing EJB 2x components is a cumbersome task since you need to deal with home interface lookup and handle several exceptions.

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