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If the tool supports a number of different databases (and most do), this confers a certain level of portability on your application You shouldn t necessarily expect write-once/run-anywhere, because the capabilities of databases differ, and achieving full portability would require sacrificing some of the strength of the more powerful platforms Nevertheless, it s usually much easier to develop a cross-platform application using ORM Even if you don t require cross-platform operation, an ORM can still help mitigate some of the risks associated with vendor lock-in In addition, database independence helps in development scenarios where developers use a lightweight local database but deploy for production on a different database..

They also provide the Java web services Developer Pack as a download from http://javasuncom/ webservices/ This large download includes many well-known Apache components: Tomcat, Xerces, Xalan, and even Ant Other vendors provide their own toolkits for supporting web services in Java We stick with the Apache Axis library, from the sibling project of Jakarta, because it is nice to be able to step into the code to debug everything We also know that if there is anything we don t like about the implementation we can get it fixed, even if that means doing it ourselves You can download Apache Axis from its home page, http://xmlapacheorg/axis/; we have used the beta-1, beta-2, and later CVS versions Like all open source projects, it is continually evolving, so some details may have changed since we wrote this.

You need to select an ORM product at some point. To make an educated decision, you need a list of the software modules and standards that are available.

Hibernate is a full object/relational mapping tool that provides all the previously listed ORM benefits The API you re working with in Hibernate is native and designed by the Hibernate developers The same is true for the query interfaces and query languages, and for how object/relational mapping metadata is defined Before you start your first project with Hibernate, you should consider the EJB 30 standard and its subspecification, Java Persistence Let s go back in history and see how this new standard came into existence Many Java developers considered EJB 21 entity beans as one of the technologies for the implementation of a persistence layer The whole EJB programming and persistence model has been widely adopted in the industry, and it has been an important factor in the success of J2EE (or, Java EE as it s now called).

Both the Sun and Apache implementations have a moderately complex deployment process: the Sun server library only works with a specially modified version of Tomcat, whereas the Apache implementation prefers that you add your services to their example web application, rather than write your own We will be patching our existing web service to support Axis, which involves some effort and some more testing..

However, over the last years, critics of EJB in the developer community became more vocal (especially with regard to entity beans and persistence), and companies realized that the EJB standard should be improved Sun, as the steering party of J2EE, knew that an overhaul was in order and started a new Java specification request (JSR) with the goal of simplifying EJB in early 2003 This new JSR, Enterprise JavaBeans 30 (JSR 220), attracted significant interest Developers from the Hibernate team joined the expert group early on and helped shape the new specification Other vendors, including all major and many smaller companies in the Java industry, also contributed to the effort An important decision made for the new standard was to specify and standardize things that work in practice, taking ideas and concepts from existing successful products and projects.

C. IP address, subnet mask, and default gateway. D. Nothing. The DHCP server will assign the necessary parameters.

Before we build our own service, we will pick an existing web service and build a client for it. This lets us explore the client-side experience and build process, before we go deeper into web service development. All that we learn here will apply to our own integration tests. The Apache Axis library contains two programs for use at build time: WSDL2Java and Java2WSDL. These programs create Java classes from a WSDL description and vice versa. There are also two tasks <java2wsdl> and <wsdl2java> which are Ant wrappers around the programs. Unfortunately, in the beta-2 release, these tasks are not part of the binary distribution; they live in the test package, and you must build them yourself. Because these tasks are not part of the official distribution, and because