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3 If you want to do complex SOAP handling, a deployment descriptor file is mandatory; this means that you must use Java and not JWS files to implement your service After deploying your application, you have to register your WSDD files with the Axis administration servlet Unless you change this server to be accessible remotely, you need to run code server side to register each deployment descriptor, and you need to make a list of all the WSDD files to register You can call the administration program from a build file via <java>, so registering local builds is easy Based on our past examples of generating XML descriptor files from Java source, readers no doubt expect a new XDoclet task at that point Unfortunately, we can t provide one because XDoclet does not support Axis at the time of writing.

Always remember that the performance of the flush process depends in part on the size of the persistence context the number of persistent objects it manages Hence, the advice we gave for managing the persistence context, in the previous section, also applies here..

We expect this to be fixed eventually; the XDoclet team has promised us that they will be writing tags for the Sun toolkit, so a matching Axis set makes sense When you are being fully rigorous, you write the XSD and then the WSDL files before you implement your service class Writing these files can be problematic; the CapeClear editor (http://wwwcapeclearcom/) is the best there is for this purpose After writing the WSDL file, call WSDL2Java with the -server attribute, and the program generates the server-side stubs for your service You can take these generated classes and implement your web service behind them..

You ve now seen the most important strategies and some optional ones for interacting with objects in a Hibernate application and what methods and operations are available on a Hibernate Session. If you plan to work only with Hibernate APIs, you can skip the next section and go directly to the next chapter and read about transactions. If you want to work on your objects with Java Persistence and/or EJB 3.0 components, read on.

We now store and load objects with the Java Persistence API This is the API you use either in a Java SE application or with EJB 30 components, as a vendor-independent alternative to the Hibernate native interfaces You ve read the first sections of this chapter and know the object states defined by JPA and how they re related to Hibernate s Because the two are similar, the first part of this chapter applies no matter what API you ll choose It follows that the way you interact with your objects, and how you manipulate the database, are also similar So, we also assume that you have learned the Hibernate interfaces in the previous section (you also miss all the illustrations if you skip the previous section; we won t repeat them here).

We have just set up an advanced build process to add SOAP support to our application. Adding the Axis libraries and configuration settings to our existing web application was relatively simple, but it forced us to add new deployment tests for missing classes, implemented through our existing <happy> JSP page. With the libraries and configuration all working, we can create web services simply by saving Java source files with a .jws extension in the main web application directory. Writing the service is half the problem; testing it, the remainder. The Axis clientside utilities come into play here, creating Java proxy classes from our services WSDL description. The WSDL2Java class can even generate basic JUnit test cases, which can act as a foundation for hand-coded unit tests.

This is important for another reason: JPA provides a subset of functionality of the superset of Hibernate native APIs In other words, there are good reasons to fall back to native Hibernate interfaces whenever you need to You can expect that the majority of the functionality you ll need in an application is covered by the standard, and that this is rarely necessary As in Hibernate, you store and load objects with JPA by manipulating the current state of an object And, just as in Hibernate, you do this in a unit of work, a set of operations considered to be atomic (We still haven t covered enough ground to explain all about transactions, but we will soon) To begin a unit of work in a Java Persistence application, you need to get an EntityManager (the equivalent to the Hibernate Session).

There is still one good reason for using cookies: hardware load balancers can direct requests to specific servers based on cookie values. CHAPTER 1 5

However, where you open a Session from a SessionFactory in a Hibernate application, a Java Persistence application can be written with managed and unmanaged units of work Let s keep this simple, and assume that you first want to write a JPA application that doesn t benefit from EJB 30 components in a managed environment..